Homepage of Jeppe Dyre.
Founder of Glass and Time ;
VILLUM Investigator
Member of the Royal Danish Academy of Sciences and Letters
Address:
Center of Viscous Liquid Dynamics Glass and
Time ,
IMFUFA, Building 27, Department of Science and
Environment, Roskilde University,
Postbox 260,
DK-4000 Roskilde,
Denmark.
Telephone:
Mobile:
Fax:
E-mail:
(+45)
46 74 22 84 (+45) 30
25 85 07 (+45) 46 74 30
20
dyre@ruc.dk
Research interests:
I.
Viscous liquids and the glass transition
Collaborating with Thomas Schrøder, Tage
Christensen, and Niels Boye Olsen - as well as with several
talented postdocs, Ph.D., and master's degree students throughout
the years - we focus on trying to answer the basic questions:
What causes the
non-Arrhenius behavior of ultraviscous liquids?
How does one explain the
non-Debye alpha relaxation?
How do we understand the
beta relaxation?
How many "order" parameters
are required for describing the thermoviscoelasticity of
glass-forming liquids?
What are the consequences
of isomorphs in a system's phase diagram?
-- We have
developed a simple model for the non-Arrhenius behavior - the
'shoving' model - according to which the energy needed for
molecular rearrangements is mainly the shear elastic energy
associated with creating extra space (1996, 1998, 2004, 2006,
2012).
-- We have found that, once interference from the
beta process is insignificant, the high-frequency exponent of
the alpha process seems to be always -1/2 (2001, 2007). One
possible explanation is that this is caused by a negative
long-time tail (2005).
--
We have proposed a phenomenological model for beta relaxation,
assuming structure is described by just one order parameter
(2003).
-- We have shown that in
many cases a single-parameter description works quite well
(2006, 2007, 2008).
-- We have studied strong
pressure-energy correlations in the equilibrium fluctuations of
model liquids and their consequences for viscous liquid dynamics
(2007-2012).
-- We have proposed the new
concept in statistical mechanics "isomorphs" in a system's phase
diagram and shown that a liquid or solid has good isomorphs if
and only if it has strong virial potential-energy correlations
(2009-2012).
-- The isomorph theory
gives rise to a new molecular dynamics, "NVU dynamics",
which consists of geodesic motion on the
constant-potential-energy hypersurface (2011, 2012).
-- A new, generic
definition of the class of Roskilde-simple systems has been
proposed (2014).
-- The quasiuniversality of
single-component Roskilde-simple liquids has been connected to
these liquids' hidden scale invariance and an analytical
criterion for quasiuniversality has been derived (2014).
-- The Narayanaswamy aging
theory has been simplified into a differential equation valid
for temperture jumps and justified from the Bochkov-Kuzovlev
nonlinear fluctuation-dissipation theorem; moreover a
microscopic expression for the material time has been identified
(2015).
Glass and Time - Center
for Viscous Liquid Dynamics, the Roskilde University glass group.
II. Ac conduction in disordered solids
Collaborating with Thomas Schrøder, we have studied the random
barrier model numerically as well as analytically (2000, 2002,
2008).
III. Other research interests:
Rheology
Ion
conduction in glasses
1/f noise
Non-linear
response theory
Workshops, etc:
VISCOUS
LIQUIDS AND THE GLASS TRANSITION (XXI )
(International
workshop, May
14-16, 2025) .
VISCOUS
LIQUIDS AND THE GLASS TRANSITION (XX) (International workshop, May 15-17, 2024) .
VISCOUS
LIQUIDS AND THE GLASS TRANSITION (XIX) (International
workshop, June
8-10, 2023) .
VISCOUS LIQUIDS AND THE
GLASS TRANSITION (XVIII) (International workshop, June
23-25, 2022) .
VISCOUS LIQUIDS AND THE
GLASS TRANSITION (XVII) (International workshop, June
10-12, 2021) .
VISCOUS
LIQUIDS AND THE GLASS TRANSITION (XVI) (International
workshop,
May 9-11, 2019) .
VISCOUS LIQUIDS AND
THE GLASS TRANSITION (XV) (International workshop, June
21-23, 2018) .
DYNAMICS OF GLASS-FORMING LIQUIDS: Will
theory and experiment ever meet?
( International workshop, April
5-7, 2017) .
GREEN ROAD
INFRASTRUCTURE IV
( International workshop, November
24-25, 2016) .
VISCOUS LIQUIDS AND THE
GLASS TRANSITION (XIV) (International workshop, June
16-18, 2016) .
TOPICAL
MEETING ON MOLECULAR DYNAMICS (Informal
workshop,
August 24, 2015) .
VISCOUS LIQUIDS AND THE
GLASS TRANSITION (XIII) (International workshop, May
28-30, 2015) .
ROLLING RESISTANCE -
THIRD COOEE WORKSHOP (International workshop, November
27-28, 2014) .
DISCUSSION
MEETING ON AGGREGATION AND CLUSTERING OF MOLECULES
(International workshop, October
30-31, 2014) .
VISCOUS LIQUIDS AND THE
GLASS TRANSITION (XII) (International workshop, June
12-14, 2014) .
TOPICAL MEETING ON
MOLECULAR DYNAMICS (Informal workshop, May
26, 2014) .
GREEN ROAD
INFRASTRUCTURE - SECOND COOEE WORKSHOP (International workshop, November
28-29, 2013) .
VISCOUS LIQUIDS AND THE
GLASS TRANSITION (XI) (International workshop, May
23-25, 2013) .
ROLLING RESISTANCE AN EXPLORATORY
WORKSHOP ( International
workshop,
November 29-30, 2012) .
VISCOUS LIQUIDS AND THE
GLASS TRANSITION (X) (International workshop, June
7-9, 2012) .
VISCOUS LIQUIDS AND THE GLASS
TRANSITION (IX) (International workshop, June
16-18, 2011) .
VISCOUS LIQUIDS AND THE GLASS
TRANSITION (VIII) (International workshop, May
28-30, 2010).
AGING OF SLOWLY RELAXING
SYSTEMS (Ph.D. summer school, June 19-24, 2009).
VISCOUS LIQUIDS AND THE GLASS
TRANSITION (VII) (International workshop, April
24-26, 2009) .
FRAGILITY
OF VISCOUS LIQUIDS: CAUSE(S) AND CONSEQUENCES
(International workshop, Carlsberg Academy, October 8-10,
2008).
LINEAR RESPONSE:
THEORY AND PRACTICE (Ph.D. summer school, July 1-8,
2007).
VISCOUS LIQUIDS AND THE GLASS
TRANSITION (VI) (International workshop, June
29 - July 1, 2007).
FLOW PROCESSES
(3 DNRF-centre workshop, May 9, 2007).
VISCOUS LIQUIDS AND THE
GLASS TRANSITION (V) (International workshop, May
26-28, 2006) .
VISCOUS LIQUIDS AND THE
GLASS TRANSITION (IV) (International workshop, June
3-5, 2005).
STRUCTURE
AND DYNAMICS OF METALS AND GLASSES (RUC-Ris workshop , June 4, 2003).
VISCOUS LIQUIDS AND THE
GLASS TRANSITION (III) (International workshop, May
9-11, 2003) .
RELAXATIONS AND RHEOLOGY OF
VISCOUS LIQUIDS AND GLASSES ( RUC-AUC-Rockwool
workshop, November 11,
2002 ) .
BIOLOGICALLY
RELEVANT PHYSICS (RUC-SDU-KVL
workshop, March 25, 2002).
VISCOUS LIQUIDS
AND THE GLASS TRANSITION (II) (International
workshop , June 16-18, 2000) .
Scientific publications:
The EXP pair-potential
system. I. Fluid phase isotherms, isochores, and
quasiuniversality [with Bacher and Schrøder], J. Chem.
Phys. 149 , 114501 (2018).
The EXP
pair-potential system. II. Fluid phase isomorphs [with Bacher and Schrøder] J. Chem. Phys. 149 ,
114502 (2018).
Phase diagram of
Kob-Andersen-type binary Lennard-Jones mixtures [with
Pedersen and Schrøder], Phys. Rev. Lett. 120 , 165501
(2018).
Isomorph theory of physical
aging , J. Chem. Phys. 148 , 154502 (2018).
Simple liquids high-density
viscosity [with Costigliola, Pedersen, Heyes, and
Schrøder], J. Chem. Phys. 148 , 081101 (2018).
Hydrodynamic relaxations in
dissipative particle dynamics [with Hansen and
Greenfield], J. Chem. Phys. 148 , 034503 (2018).
RUMD: A general purpose
molecular dynamics package [with Bailey, Schrøder, et
al. ], SciPost Phys. 3 , 038 (2017).
Simple-liquid dynamics
emerging in the mechanical shear spectra of PPG [with
Gainaru, Hecksher, Bhmer, et al. ], Colloid Polym. Sci. 295 ,
2433 (2017).
Toward broadband mechanical
spectroscopy [with Hecksher, Torchinsky, Klieber, Johnson,
and Nelson], Proc. Natl. Acad. Sci. (USA) 114 , 8710
(2017).
Density-scaling exponents and
virial potential-energy correlations in the (2n, n)
Lennard-Jones system [with Friisberg and Costigliola], J.
Chem. Sci. 129 , 919 (2017).
Model for the alpha and beta
shear-mechanical properties of supercooled liquids and its
comparison to squalane data [with Hecksher and Olsen], J.
Chem. Phys. 146 , 154504 (2017).
Connection between fragility,
MSD, and shear modulus in two glass-forming liquids [with
Hansen, Frick, Hecksher, and Niss], Phys. Rev. B 95 ,
104202 (2017).
Pseudoisomorphs in liquids
with intramolecular degrees of freedom [with Olsen and
Schrøder], J. Chem. Phys. 145 , 241103 (2016).
Rayleigh
scattering revisited ['News and Views'], Nat. Mater. 15 ,
1150 (2016).
Pair potential that reproduces
the shape of isochrones in molecular liquids [with
Veldhorst and Schrøder], J. Phys. Chem. B 120 , 7970
(2016).
Thermodynamics of freezing and
melting [with Pedersen, Costigliola, Bailey, and
Schrøder], Nat. Commun. 7 , 12386 (2016).
Simple liquids'
quasiuniversality and the hard-sphere paradigm , J. Phys.:
Condens. Matter 28 , 323001 (2016).
Studies of the Lennard-Jones
fluid in 2, 3, and 4 dimensions highlight the need for a
liquid-state 1/d expansion [with Costigliola and
Schrøder], J. Chem. Phys. 144 , 231101 (2016).
Freezing and melting line
invariants of the Lennard-Jones system [with Costigliola
and Schrøder], Phys. Chem. Chem. Phys. 18 , 14678 (2016).
Thermalization calorimetry: A
simple method for investigating glass transition and
crystallization of supercooled liquids [with Jakobsen et
al. ], AIP Adv. 6 , 055019 (2016).
Continuum nanofluidics [with
Hansen, Daivis, Todd, and Bruus], Langmuir 31 , 13275
(2015).
Hidden scale invariance of
metals [with Hummel, Kresse, and Pedersen], Phys. Rev. B 92 ,
174116 (2015).
Scaling of the dynamics of
flexible Lennard-Jones chains. Effects of harmomic bonds
[with Veldhorst and Schrøder], J. Chem. Phys. 143 ,
194503 (2015).
Narayanaswamys 1971 aging
theory and material time , J. Chem. Phys. 143 ,
114507 (2015).
Invariants in the Yukawa systems
thermodynamic phase diagram [with Veldhorst and Schrøder],
Phys. Plasmas 22 , 073705 (2015).
Direct tests of
single-parameter aging [with Hecksher and Olsen], J. Chem.
Phys. 142 , 241103 (2015).
A review of experiments testing
the shoving model [with Hecksher], J. Non-Cryst. Solids 407 ,
14 (2015).
Isomorph theory prediction for
the dielectric loss variation along an isochrone [with
Xiao, Tofteskov, Christensen, and Niss], J. Non-Cryst. Solids 407 ,
190 (2015).
Rolling resistance neasurement and
model development [with Andersen,
Larsen, Fraser, and Schmidt], ACSE J. Transp. Eng. 140 ,
04014075 (2015).
Simplicity of condensed matter
at its core: Generic definition of a Roskilde-simple system
[with Schrøder], J. Chem. Phys. 141 , 204502 (2014).
Density scaling and
quasiuniversality of flow-event statistics for athermal
plastic flows [with Lerner and Bailey], Phys. Rev. E 90 ,
052304 (2014).
Explaining why simple liquids are
quasi-universal [with Bacher and Schrøder], Nat. Commun.
5 , 5424 (2014).
Variation of the dynamic
susceptibility along an isochrone [with Bailey and
Schrøder], Phys. Rev. E 90 , 042310 (2014).
Cooee bitumen. II. Stability
of linear asphaltene nanoaggregates [with Lemarchand,
Schrøder, and Hansen], J. Chem. Phys. 141 , 144308
(2014).
Isomorph invariance of the
structure and dynamics of classical crystals [with
Albrechtsen, Olsen, Pedersen, and Schrøder], Phys. Rev. B 90 ,
094106 (2014).
Hidden scale invariance in
condensed matter , J. Phys. Chem. B 118 , 10007
(2014).
Scaling of the dynamics of
flexible Lennard-Jones chains [with Veldhorst and
Schrøder], J. Chem. Phys. 141 , 054904 (2014).
The mother of all pair
potentials [with Bacher], Colloid. Polym. Sci. 292 ,
1971 (2014).
Oscillatory shear and
high-pressure dielectric study of 5-methyl-3-heptanol
[with Gainaru et al. ], Colloid. Polym. Sci. 292 ,
1913 (2014).
The dynamic bulk modulus of
three glass-forming liquids [with Gundermann, Niss,
Christensen, and Hecksher], J. Chem. Phys. 140 , 244508
(2014).
The impact range for smooth
wallliquid interactions in nanoconfined liquids [with
Ingebrigtsen], Soft Matter 10 , 4324 (2014).
Estimating the density-scaling
exponent of a monatomic liquid from its pair potential
[with Bøhling, Bailey, and Schrøder], J. Chem. Phys. 140 ,
124510 (2014).
Entropy and relaxation time , pp.
81-90 in "Fragility of Glass-Forming Liquids", Eds. A. L. Greer,
K. F. Kelton, S. Sastry (Hindustan Book Agency, New Delhi,
2014); arXiv:1403.2684 (2014).
Shear-modulus investigations
of monohydroxy alcohols: Evidence for a short-chain-polymer
rheological response [with Gainaru, Figuli, Hecksher,
Jakobsen, Wilhelm, Bhmer], Phys. Rev. Lett. 112 , 098301
(2014).
Predicting how nanoconfinement
changes the relaxation time of a supercooled liquid [with
Ingebrigtsen, Errington, and Truskett], Phys. Rev. Lett. 111 ,
235901 (2013).
Statistical mechanics of
Roskilde liquids: Configurational adiabats, specific heat
contours, and density dependence of the scaling exponent
[with Bailey, Bøhling, Veldhorst, and Schrøder], J. Chem. Phys.
139 , 184506 (2013).
The Rosenfeld-Tarazona
expression for liquids specific heat: A numerical
investigation of eighteen systems [with Ingebrigtsen,
Veldhorst, and Schrøder], J. Chem. Phys. 139 , 171101
(2013).
Isomorphs, hidden scale
invariance, and quasiuniversality , Phys. Rev. E 88 ,
042139 (2013).
Cooee bitumen: Chemical aging
[with Lemarchand, Schrøder, and Hansen], J. Chem. Phys. 139 ,
124506 (2013).
Two measures of isochronal
superposition [with Roed, Gundermann, and Niss], J.
Chem. Phys. 139 , 101101 (2013).
A cool liquid that does not
freeze ['News and Views'], Nat. Phys. 9 , 535
(2013).
Aging of CKN: Modulus versus
conductivity analysis , Phys. Rev. Lett. 110 ,
245901 (2013).
Isomorph invariance of
Couette shear flows simulated by the SLLOD equations of motion
[with Separdar, Bailey, Schrøder, and Davatolhagh], J. Chem.
Phys. 138 , 154505 (2013).
Four-component united-atom
model of bitumen [with Hansen, Lemarchand, Nielsen, and
Schrøder], J. Chem. Phys. 138 , 094508 (2013).
Mechanical spectra of
glass-forming liquids. I. Low-frequency bulk and shear
moduli of DC704 and 5-PPE measured by piezoceramic transducers
[with Hecksher, Olsen, Nelson, and Christensen], J. Chem. Phys.
138 , 12A543 (2013).
Mechanical spectra of
glass-forming liquids. II. Gigahertz-frequency longitudinal
and shear acoustic dynamics in glycerol and DC704 studied by
time-domain Brillouin scattering [with Klieber, Hecksher,
Pezeril, Torchinsky, and Nelson], J. Chem. Phys. 138 ,
12A544 (2013).
NVU perspective on simple liquids
quasiuniversality , Phys. Rev. E 87 , 022106 (2013).
Generalized extended
Navier-Stokes theory: Correlations in molecular fluids with
intrinsic angular momentum [with Hansen, Daivis, Todd,
Bruus], J. Chem. Phys. 138 , 034503 (2013).
Do the repulsive and
attractive pair forces play separate roles for the physics of
liquids? [with Bøhling, Veldhorst, Ingebrigtsen, Bailey,
Hansen, Toxværd, and Schrøder], J. Phys.: Condens. Matter 25 ,
032101 (2013).
NVU dynamics. III. Simulating molecules at
constant potential energy [with Ingebrigtsen], J. Chem.
Phys. 137 , 244101 (2012).
Cooling by heating demonstrating
the significance of the longitudinal specific heat [with
Papini and Christensen], Phys. Rev. X 2 , 041015 (2012).
Scaling of viscous dynamics in
simple liquids: Theory, simulation and experiment [with
Bøhling, Ingebrigtsen, Grzybowski, Paluch, and Schrøder], New J.
Phys. 14 , 113035 (2012).
Experimental studies of
Debye-like process and structural relaxation in mixtures of
2-ethyl-1-hexanol and 2-ethyl-1-hexyl bromide [with
Preuss, Gainaru, Hecksher, Bauer, Richert, and Bhmer], J.
Chem. Phys. 137 ,
144502 (2012).
Measurement of the four-point
susceptibility of an out-of-equilibrium colloidal solution of
nanoparticles using time-resolved light scattering [with
Maggi, Di Leonordo, and Ruocco], Phys. Rev. Lett. 109 , 097401 (2012).
Shear and dielectric responses
of propylene carbonate, tripropylene glycol, and a mixture of
two secondary amides [with Gainaru, Hecksher, Olsen, and
Bhmer], J. Chem. Phys. 137 ,
064508 (2012).
CO 2 emission reduction by
exploitation of rolling resistance modelling of pavements
[with Schmidt], Procedia 48 ,
311 (2012).
The instantaneous shear
modulus in the shoving model [with Wang], J. Chem. Phys. 136 , 224108 (2012).
Energy conservation in
molecular dynamics simulations of classical systems [with
Toxværd and Heilmann], J. Chem. Phys. 136 , 224106 (2012).
Simplistic Coulomb forces in
molecular dynamics: Comparing the Wolf and shifted-force
approximations [with Schmidt and Schrøder], J. Phys. Chem.
B 116 , 5738 (2012).
Dynamic thermal expansivity of
liquids near the glass transition [with Niss, Gundermann,
and Christensen], Phys. Rev. E 85 ,
041501 (2012).
What is a simple liquid?
[with Ingebrigtsen and Schrøder], Phys. Rev. X 2 , 011011 (2012).
Identical temperature
dependence of the time scales of several linear-response
functions of two glass-forming liquids [with Jakobsen,
Hecksher, Christensen, Olsen, and Niss], J. Chem. Phys. 136 , 081102 (2012).
Thermodynamics of condensed
matter with strong pressure-energy correlations [with
Ingebrigtsen, Bøhling, and Schrøder], J. Chem. Phys. 136 , 061102 (2012).
Isomorphs in the phase diagram of
a model liquid without inverse power law repulsion [with
Veldhorst, Bøhling, and Schrøder], Eur. Phys. J. B 85 , 21 (2012).
Isomorphs in model molecular
liquids [with Ingebrigtsen and Schrøder], J. Phys. Chem. B
116 , 1018 (2012).
Predicting the density scaling
exponent from Prigogine-Defay ratio measurements [with
Gundermann, Pedersen, Hecksher, Bailey, Jakobsen, Christensen,
Olsen, Schrøder, Fragiadakis, Casalini, Roland, and Niss], Nat.
Phys. 7 , 816 (2011) - News & Views .
Role of the first
coordination shell in determining the equilibrium structure
and dynamics of simple liquids [with Toxværd], J.
Chem. Phys. 135 , 134501
(2011).
Nanoflow hydrodynamics
[with Hansen, Daivis, Todd, and Bruus], Phys. Rev. E 84 , 036311 (2011).
NVU dynamics. I.
Geodesic motion on the constant-potential-energy hypersurface
[with Ingebrigtsen, Toxværd, Heilmann, and Schrøder], J. Chem.
Phys. 135 , 104101
(2011).
NVU dynamics. II. Comparing to
four other dynamics [with Ingebrigtsen, Toxværd, and
Schrøder], J. Chem. Phys. 135 ,
104102 (2011).
Simulations of
crystallization in supercooled nanodroplets in the presence of
a strong exothermic solute [with Toxværd and Larsen], J.
Phys. Chem. C 115 ,
12808 (2011).
Pressure-energy correlations
in liquids. V. Isomorphs in generalized Lennard-Jones systems
[with Schrøder, Gnan, Pedersen, and Bailey], J. Chem. Phys. 134 , 164505 (2011).
Do all liquids become strongly
correlating at high pressure? [with Papini and Schrøder],
arXiv:1103.4954 (2011).
Shifted forces in molecular
dynamics [with Toxværd], J. Chem. Phys. 134 , 081102 (2011).
Beta relaxation in the shear
mechanics of viscous liquids: Phenomenology and network
modeling of the alpha-beta merging region [with Jakobsen,
Niss, Maggi, Olsen, and Christensen], J. Non-Cryst. Solids 357 , 267 (2011).
Strongly correlating liquids and
their isomorphs [with Pedersen, Gnan, Bailey, and
Schrøder], J. Non-Cryst. Solids 357 , 320 (2011).
A combined measurement of
thermal and mechanical relaxation [with Christensen,
Jakobsen, Papini, Hecksher, and Olsen], J. Non-Cryst. Solids 357 , 346 (2011).
Physical aging of molecular
glasses studied by a device allowing for rapid thermal
equilibration [with Hecksher, Olsen, and Niss], J. Chem.
Phys. 133 , 174514
(2010).
Repulsive reference potential
reproducing the dynamics of a liquid with attractions
[with Pedersen and Schrøder], Phys. Rev. Lett. 105 , 157801 (2010).
Connection between slow
and fast dynamics of molecular liquids around the glass
transition [with Niss, Dalle-Ferrier, Frick, Russo, and
Alba-Simionesco], Phys. Rev. E 82 ,
021508 (2010).
Aging effects manifested
in the potential-energy landscape of a model glass former
[with Rehwald, Gnan, Heuer, Schrøder, and Diezemann], Phys. Rev.
E 82 , 021503 (2010).
Time reversible molecular
dynamics algorithms with holonomic bond constraints in the NPH
and NPT ensembles using molecular scaling [with
Ingebrigtsen, Heilmann, and Toxværd], J. Chem. Phys. 132 , 154106 (2010).
Predicting the effective
temperature of a glass [with Gnan, Maggi, and Schrøder],
Phys. Rev. Lett. 104 ,
125902 (2010).
Geometry of slow structural
fluctuations in a supercooled binary alloy [with Pedersen,
Schrøder, and Harrowell], Phys. Rev. Lett. 104 , 105701 (2010).
Generalized
fluctuation-dissipation relation and effective temperature in
off-equilibrium colloids [with Maggi, Di Leonardo, and
Ruocco], Phys. Rev. B 81 ,
104201 (2010).
Correlated volume-energy
fluctuations of phospholipid membranes: A simulation study
[with Pedersen, Peters, and Schrøder], J. Phys. Chem. B 114 , 2124 (2010).
An electrical circuit model of
the alpha-beta merging seen in dielectric relaxation of
ultraviscous liquids (with Sağlanmak, Nielsen, Olsen, and
Niss), J. Chem. Phys. 132 , 024503 (2010).
Pressure-energy correlations
in liquids. III. Statistical mechanics and
thermodynamics of liquids with hidden scale invariance
[with Schrøder, Bailey, Pedersen, and Gnan], J. Chem. Phys. 131 , 234503 (2009).
Pressure-energy correlations
in liquids. IV. "Isomorphs"
in liquid phase diagrams [with Gnan, Schrøder, Pedersen,
and Bailey], J. Chem. Phys. 131 ,
234504 (2009).
Hidden scale invariance in
molecular van der Waals liquids: A simulation study [with
Schrøder, Pedersen, Bailey, and Toxværd], Phys. Rev. E 80 , 041502 (2009).
Time-reversible molecular
dynamics algorithms with bond constraints [with Toxværd,
Heilmann, Ingebrigtsen, and Schrøder], J. Chem. Phys. 131 , 064102 (2009).
Stability of supercooled
binary liquid mixtures [with Toxværd, Pedersen, and
Schrøder], J. Chem. Phys. 130 ,
224501 (2009).
Estimating the density scaling exponent
of viscous liquids from specific heat and bulk modulus data
[with Pedersen, Hecksher, Jakobsen, Schrøder, Gnan, and Bailey],
arXiv:0904.3537 (2009).
A brief critique of the
AdamGibbs entropy model [with Hecksher and Niss], J.
Non-Cryst. Solids 355 ,
624 (2009).
Prevalence of
approximate squareroot(time) relaxation for the dielectric
alpha process in viscous organic liquids [with Nielsen,
Christensen, Jakobsen, Niss, Olsen, and Richert], J. Chem. Phys.
130 , 154508 (2009).
Fundamental questions
relating to ion conduction in disordered solids [with
Maass, Roling, and Sidebottom], Rep. Prog. Phys. 72 , 046501 (2009).
Exponential distributions of
collective flow-event properties in viscous liquid dynamics
[with Bailey and Schrøder], Phys. Rev. Lett. 102 , 055701 (2009).
Supercooled
liquid dynamics studied via shear-mechanical spectroscopy
[with Maggi, Jakobsen, Christensen, and Olsen], J. Phys. Chem. B
112 , 16320 (2008).
Pressure dependence of the
dielectric loss minimum slope for ten molecular liquids
[with Nielsen, Pawlus, and Paluch], Phil. Mag. 88 , 4101 (2008).
Investigation of the
shear-mechanical and dielectric relaxation processes in two
monoalcohols close to the glass transition [with Jakobsen,
Maggi, and Christensen], J. Chem. Phys. 129 , 184502 (2008).
Solution of the spherically
symmetric linear thermoviscoelastic problem in the
inertia-free limit [with Christensen], Phys. Rev. E 78 , 021501 (2008).
Little evidence for
dynamic divergences in ultraviscous molecular liquids
[with Hecksher, Nielsen, and Olsen], Nat. Phys. 4 , 737 (2008) - News & Views .
Ac hopping conduction at
extreme disorder takes place on the percolating cluster
[with Schrøder], Phys. Rev. Lett. 101 , 025901 (2008).
Pressure-energy correlations
in liquids. I. Results from computer simulations
[with Bailey, Pedersen, Gnan, and Schrøder], J. Chem. Phys. 129 , 184507 (2008).
Pressure-energy correlations
in liquids. II. Analysis and consequences [with Bailey,
Pedersen, Gnan, and Schrøder], J. Chem. Phys. 129 , 184508 (2008).
Glass-forming liquids: One or
more order parameters? [with Bailey, Christensen,
Jakobsen, Niss, Olsen, Pedersen, and Schrøder], J. Phys.
Condens. Matter 20 ,
244113 (2008).
Can the
frequency-dependent isobaric specific heat be measured by
thermal effusion methods? [with Christensen and Olsen],
AIP Conf. Proc. 982 ,
139 (2008).
Volume-energy
correlations in the slow degrees of freedom of
computer-simulated phospholipid membranes [with Pedersen,
Peters, and Schrøder], AIP Conf. Proc. 982 , 407 (2008).
A cryostat and
temperature control system optimized for measuring relaxations
of glass-forming liquids [with Igarashi et al.], Rev. Sci.
Instrum. 79 , 045105
(2008).
An
impedance-measurement setup optimized for measuring
relaxations of glass-forming liquids [with Igarashi et
al.], Rev. Sci. Instrum. 79 ,
045106 (2008).
Feasibility of single-parameter
description of equilibrium viscous liquid dynamics [with
Pedersen, Christensen, and Schrøder], Phys. Rev. E 77 , 011201 (2008).
Mysteries of the glass transition
- Letter commenting on a Reference Frame by James Langer,
Physics Today 61 (1),
15 (2008).
Strong pressure-energy
correlations in van der Waals liquids [with Pedersen,
Bailey, and Schrøder], Phys. Rev. Lett. 100 , 015701 (2008).
Solidity of viscous liquids. V.
Long-wavelength dominance of the dynamics , Phys. Rev. E 76 , 041508 (2007).
Crystallization of the Wahnstrm
Binary Lennard-Jones Liquid [with Pedersen, Bailey, and
Schrøder], arXiv:0706.0813 (2007).
Ten themes of viscous liquid
dynamics , J. Phys.: Condens. Matter 19 , 205105 (2007).
Conventional methods fail to
measure cp(omega) of glass-forming liquids [with
Christensen and Olsen], Phys. Rev. E 75 , 041502 (2007).
Dominance of shear
elastic energy far from a point defect in a solid , Phys.
Rev. B 75 , 092102
(2007).
Violations of conservation laws in
viscous liquid dynamics , Philos. Mag. 87 , 497 (2007).
Hopping models for ion conduction
in noncrystals [with Schrøder], in "Superionic Conductor
Physics" (World Scientific, Singapore, 2007), p. 97 (2007).
Single-order-parameter
description of glass-forming liquids: A one-frequency test
[with Ellegaard, Christensen, Christiansen, Olsen, Pedersen, and
Schrøder], J. Chem. Phys. 126 ,
074502 (2007).
Solidity-induced crystallization of
ultraviscous water (January, 2007).
On the possible existence of
crystallites in glass-forming liquids , cond-mat/0612671
(2006).
An energy landscape model f or glass-forming liquids in
three dimensions [with Pedersen, Hecksher, and Schrøder],
J. Non-Cryst. Solids 352 ,
5210 (2006).
Elastic models for the
non-Arrhenius viscosity of glass-forming liquids [with
Christensen and Olsen], J. Non-Cryst. Solids 352 , 4635 (2006).
The glass transition and elastic
models of glass-forming liquids , Rev. Mod. Phys. 78 , 953 (2006).
Solidity of viscous liquids.
IV. Density fluctuations , Phys. Rev. E 74 , 021502 (2006).
Elastic models for the
non-Arrhenius relaxation time of glass-forming liquids ,
AIP Conf. Proc. 832 ,
113 (2006).
A model for the generic alpha
relaxation of viscous liquids , Europhys. Lett. 71 , 646 (2005).
Solidity of viscous liquids.
III. Alpha relaxation , Phys. Rev. E 72 , 011501 (2005).
Glasses: Heirs of liquid
treasures ['News and Views'], Nat. Mater. 3 , 749 (2004).
Landscape equivalent of the
shoving model [with Olsen], Phys. Rev. E 69 , 042501 (2004).
Minimal model for beta
relaxation in viscous liquids [with Olsen], Phys. Rev.
Lett. 91 , 155703
(2003).
Is there a
'native' band gap in ion conducting glasses? , J.
Non-Cryst. Solids 324 ,
192 (2003).
Computer
simulations of the random barrier model [with Schrøder],
Phys. Chem. Chem. Phys. 4 ,
3173 (2002).
Hopping models and ac universality
[with Schrøder], Phys. Stat. Sol. (b) 230 , 5 (2002).
Time-temperature
superposition in viscous liquids [with Olsen and
Christensen], Phys. Rev. Lett. 86 , 1271 (2001).
Beta relaxation of non-polymeric
liquids close to the glass transition [with Olsen and
Christensen], Phys. Rev. E 62 ,
4435 (2000).
Universality of ac conduction in
disordered solids [with Schrøder], Rev. Mod. Phys. 72 , 873 (2000).
Crossover
to potential energy landscape dominated dynamics in a model
glass-forming liquid [with Schrøder, Sastry, and
Glotzer], J. Chem. Phys. 112 ,
9834 (2000).
Scaling and
universality of ac conduction in disordered solids [with
Schrøder], Phys. Rev. Lett. 84 ,
310 (2000).
Solidity of viscous liquids.
II. Anisotropic flow events , Phys. Rev. E 59 , 7243 (1999).
Solidity of viscous liquids ,
Phys. Rev. E 59 , 2458
(1999).
Potential energy landscape
signatures of slow dynamics in glass-forming liquids [with
Sastry, Debenedetti, Stillinger, Schrøder, and Glotzer],
Physica A 270 , 301
(1999).
Source of
non-Arrhenius average relaxation time in glass-forming
liquids , J. Non-Cryst. Solids 235-237 , 142 (1998).
Hopping in a supercooled
binary LennardJones liquid [with Schrøder], J. Non-Cryst. Solids 235-237 , 331 (1998).
Structural relaxation monitored
by instantaneous shear modulus [with Olsen and
Christensen], Phys. Rev. Lett. 81 , 1031 (1998).
Fluctuation-dissipation
theorem for frequency-dependent specific heat [with
Nielsen], Phys. Rev. B 54 ,
15754 (1996).
Effective
one-dimensionality of universal ac hopping conduction in the
extreme disorder limit [with Schrøder], Phys. Rev. B 54 , 14884 (1996).
Universality of anomalous
diffusion in extremely disordered systems [with
Jacobsen], Chem. Phys. 212 ,
61 (1996).
Comment on
"Dynamic viscosity of a simple glass-forming liquid"
[with Behrens, Christiansen, Christensen, and Olsen ], Phys. Rev. Lett. 76 , 1553 (1996).
Local elastic
expansion model for viscous-flow activation energies of
glass-forming molecular liquids [with Olsen and
Christensen], Phys. Rev. B 53 ,
2171 (1996).
Universal time-dependence of the
mean-square displacement in extremely rugged energy
landscapes with equal minima [with Jacobsen], Phys. Rev.
E 52 , 2429 (1995).
Lunar phase influence on
global temperatures , Science 269 , 1284 (1995).
Energy master equation - a
low-temperature approximation to Bssler's random-walk model ,
Phys. Rev. B 51 ,
12276 (1995).
A Statistical
Mechanical Approximation for the Calculation of Time
Auto-Correlation Functions , IMFUFA tekst No. 287
(1994); arXiv version: cond-mat/9712222
(1997).
Studies of ac hopping
conduction at low temperatures , Phys. Rev. B 49 , 11709 (1994).
Low-temperature
universality in computer simulations of the macroscopic
model for ac conduction in disordered solids [with
Riedel], J. Non-Cryst. Solids 172-174 , 1419 (1994).
Algorithm for fast determination
of complex moduli [with Winther and Kramer], J. Rheol. 38 , 1179 (1994).
Universal low-temperature ac
conductivity of macroscopically disordered nonmetals ,
Phys. Rev. B 48 ,
12511 (1993).
Universal ac conductivity
of nonmetallic disordered solids at low temperatures ,
Phys. Rev. B 47 , 9128
(1993).
Langevin models
for shear-stress fluctuations in flows of viscoelastic
liquids , Phys. Rev. E 48 ,
400 (1993).
Towards a phenomenological
definition of the term 'gel' [with Almdal, Hvidt, and
Kramer], Polymer Gels and Networks 1 , 5 (1993).
Some remarks on ac conduction
in disordered solids , J. Non-Cryst. Solids 135 , 219 (1991).
A 'zero-parameter' constitutive
relation for simple shear viscoelasticity , Rheol. Acta 29 , 145 (1990).
Maximum-entropy
ansatz for nonlinear-response theory , Phys. Rev. A 40 , 2207 (1989).
Correlation
effects in ionic conductivity [with Murch], Crit. Rev.
Solid State 15 , 345
(1989).
Random free-energy barrier
model for ac conduction in disordered solids , J. Appl.
Phys. 64 , 2456
(1988).
Unified formalism for excess
current noise in random-walk models , Phys. Rev. B 37 , 10143 (1988).
Tracer and physical correlation factors in diffusion [with
Murch], Adv. Ceramics 23 ,
331 (1987).
Exponential band tails as a consequence
of the glass transition , Key Engn. Mater. 13 , 501 (1987).
Master-equation approach to the
glass-transition , Phys. Rev. Lett. 58 , 792 (1987).
A phenomenological
model for the Meyer-Neldel rule , J. Phys. C: Solid State
Phys. 19 , 5655 (1986).
On the
mechanism of glass ionic conductivity , J. Non-Cryst.
Solids 88 , 271
(1986).
Correlation
effects in tracer diffusion and ionic conductivity II
[with Murch], Solid State Ionics 21 ,139 (1986).
Correlation effects in tracer
diffusion and ionic conductivity I [with Murch],
Solid State Ionics 20 ,
203 (1986).
A simple model of ac hopping
conductivity , J. Physique Colloq. 46 , C8-343 (1985).
A simple model of ac hopping
conductivity in disordered solids , Phys. Lett. A 108 , 457 (1985).
Conductivity correlation in systems of non-interacting
particles, Philos. Mag. A 50 ,
585 (1984).
Non-standard characterizations of
ideals in C(X) , Math. Scand. 50 , 44 (1982).
Press and other publications [mostly
in Danish]
Læren
af Kinas dominans og kontrol med sjældne jordarter
(med Christian Knudsen), Politikens kronik, 12. januar,
2026.
Regeringen
glemmer forskningen (med Marianne Holmer),
Berlingske 1. juli, 2025.
Sats på
de store tidsskrifter og dine originale ideer ,
Forskerforum, maj 2025.
Vingeslag på formel (med Tina
Hecksher og Jens Hjgaard Jensen), Aktuel Naturvidenskab, nr.
3, p. 18, 2024.
ROSE , brief video about the project that
led to "KVS asphalt", presented at the 10-year anniversary of
Innovation Fund Denmark, April 16, 2024 .
Første mling af
materiale-tid , Aktuel Naturvidenskab, nr. 1, p. 5,
2024.
Glass
ages in material time , Search and Discovery article, Physics Today, May, 2022.
Physical
aging: Theory and Experiments ,
talk at "Recent advances on the glass problem", Jan. 5, 2022
(CECAM on-line conference).
Entropiens
mysterium (med Ingebrigtsen),
Aktuel Naturvidenskab, nr. 1, p. 14, 2022.
Topforskere: Træk lod om
forskningsmidlerne , Forskerforum,
januar 2021.
Einstein
lærte os at finde vej , Podcast
fra Videnskabernes Selskab, 12. november, 2020.
Forstemmende forhold
for forskningen , Politiken, 14.
maj, 2020.
The trace back to
the 1960s , video of talk at the
informal meeting Ten Years of
Isomorph Theory , 18. december,
2019.
Lodtrækning skal give en mere
fair fordeling af forskningsmidler ,
Science Report, 16. december, 2019.
EU ger sit
forskningsbudget men det gør overhovedet ingen forskel for
dansk forskning , Science Report,
24. november, 2019.
Klimavenlig asfalt reducerer
rullemodstand, Aktuel
Naturvidenskab, nr. 6, p. 5, 2018.
Ny klimavenlig asfalt giver
solid rabat til bilejerne , DR, 22.
maj, 2018.
Et ormehul
i termodynamikken , Weedendavisen,
19. maj, 2017.
Må
man koge vand to gange? ,
Videnskab.dk, 20. februar, 2017.
Ny teori for smeltning og frysning (med Ulf Pedersen), Aktuel Naturvidenskab, nr. 4, p.
19, 2016.
Naturvidenskabelig
dannelse , gæst i "Hjernekassen p
P1", 25. januar, 2016.
Hvad med en
naturvidenskablig kanon? (med
Henriette Wase Hansen), Politiken, 19. oktober, 2015.
Energibesparelse uden omkostning (med Jesper Larsen og Bjarne Schmidt), Børsens
kronik, 1. juli, 2015.
Professor:
Nedlg UVVU , Indlæg om
Klarlund-sagen efter Østre Landsrets omstødelse af UVVU-dommen,
Altinget.dk, 17. marts, 2015;
- genoptrykt i BioZoom , September 2015.
Den
isomorfe teori , en 22 minutters
video på YouTube af Mikkel Max om isomorfteorien med interviews,
8. april, 2015.
Skyggepris. Bedre
veje giver lavere CO 2
udslip , (m. Jesper Larsen og Bjarne
Schmidt), Analyse i Politiken, 4. juni, 2014.
I strid med
sund fornuft (med en række andre),
Weekendavisen 20. juni, 2014.
Hvordan
kan atomer holde formen på en genstand? , Videnskab.dk, 12. maj, 2014.
Opråb til UVVU (med Gregersen, Hjorth og Nosch), Weekendavisen
11.oktober, 2013.
45
år med computersimuleringer ,
Videnskab.dk, 14. juli, 2013 (først publiceret i Dansk Kemi).
Verdens ældste
fysikforsøg drypper igen ,
Berlingske 3. maj, 2013.
Cyklister er
sunde og cykling ligeså, Politiken
25. april, 2013.
Grafikkort sætter Newton på
speed (med Jesper Schmidt Hansen,
Nicholas P. Bailey og Thomas Schrøder), Aktuel Naturvidenskab,
nr. 1, 2013.
Rullemodstand. Sådan
sparer vi energi på vejen (m.
Jesper Larsen og Bjarne Schmidt), Politiken, 28. november, 2012.
Overraskende opdagelse om
væsker , Rubrik, april 2012.
Glas
kan smelte ved hjælp af kvantevibrationer , Videnskab.dk, 18. februar 2011.
Forskning i
bedre asfalt kan spare bilister for millioner, Dagbladet Roskilde Tidende, 4. februar 2011.
Bedre
asfalt skal reducere CO 2 -udledningen , Videnskab.dk, 24. januar 2011.
Bedre
asfalt skal spare benzin , Politiken
23. januar 2011.
P1
morgenindslag , 16.januar 2010.
Videnskabens
Verden , Program p P1, 16. januar
2010.
Den fjerde tilstand , Weekendavisen, 16. oktober, 2009.
Glas
er ikke bare glas . Nyhedsindslag i
TV2 Lorry, 18. september 2009 .
Overraskelsesangreb ramte
forsiden , Videnskab.dk, 22. januar,
2009.
Termiske
fluktuationer er der noget nyt under Solen? , (med Ulf Pedersen og Thomas Schrøder) Kvant
(Tidsskrift for Fysik og Astronomi) 19
(4), 26 (2008).
100 milliarder sole i Mlkevejen , Weekendavisens minikronik, 4. januar, 2008.
Glastilstanden , Naturens Verden 7/8 ,
47 (2007).
Glas - en sej væske! , Hippocampus 13/05 2007.
Glas -
den fjerde tilstandsform , Aktuel
Naturvidenskab, nr. 2, 2006.
Seje væskers fysik , debut på Politikens ny serie "Kedsomologi", 8.
januar, 2006.
Seje væsker og glasovergangen (med Thomas Schrøder), Kvant (Tidsskrift for Fysik og
Astronomi) 17 (1), 12 (2006).
Interview i "Glas" -
Tidsskrift for Glarmesterlauget i Danmark , Efterr 2005 (side 10-11).
Interview i forbindelse
med Connect Denmark arrangementet "Meet the researcher" , September 2005.
En introduktion til mekanik , indledning til SMK på mekanikken - Experimentariums skolekonkurrence 2005 for 3. og 4.
klasser, juli 2005.
Omtale og interview i RUC-NYT i forbindelse med centeråbningen d. 2. juni 2005
(side 3).
Universitetslisten , program ved valget af VIP-repræsentant i RUCs
bestyrelse, maj, 2004.
Tre
sandheder om projektarbejdet: Fra "Ja" til "Tja" , indlæg ved IMFUFAs jubilumskonference, oktober,
2003.
Forskningsfrihed i fare (med Mogens Niss), debatindlæg i Jyllands-Posten, 17.
februar, 2003.
Faglig nedtur ,
Politikens kronik, 7. januar, 2003.
Back to basics! , Kvant (Tidsskrift for Fysik og Astronomi) 13 (3), 34 (2002).
Fysikkens æstetik , festtalen ved RUCs årsfest d. 21. september, 2001.
Den kolde fusion gav
varme ører [m. Pia Borgstrm],
Samvirke p. 78, juni, 2000.
Når en væske "glasser" (med Tage Christensen og Niels Boye Olsen)- kort og
populrt om vores forskning (fra RUC-NYT, 1997/98).
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Do you mind when things don't
pan out?
I think the world' s concept of success and failure is
sort of mixed up. I don't think the Good Lord really cares
whether you succeed or fail. He just wants you to try, and
try hard.
Wilson Greatbatch (b. 1919), inventor of the
pacemaker.
[New Scientist, April 2004]
The real
difficulty in changing any enterprise lies not in developing new
ideas, but in escaping from the old ones.
- John Maynard Keynes