publications  

2017  J. Cividini, D. Mukamel, and H.A. Posch, "Driven tracers in narrow channels", Phys. Rev. E 95 , 012110 (2017). (pdf)  
2015  H. van Beijeren and H.A. Posch, "Hydrodynamics in onedimensional systems", J. Stat. Mech., submitted (June 2015). 

2014  H. Bosetti and H.A. Posch, "What does dynamical systems theory teach us about fluids", Commun. Theor. Physics, 62, 451  468 (2014). (pdf)  
2013  H.A. Posch, "Symmetry properties of orthogonal and covariant Lyapunov vectors and their exponents", J. Phys. A  Math. Theor., 46, 254006 (2013); arXiv:1107.4032 H. Bosetti and H.A. Posch, "Orthogonal versus covariant Lyapunov vectors for rough hard disk systems", J. Phys. A  Math. Theor., 46, 254011 (2013); arXiv: 1111.5951 (pdf) 

2012  I. Fouxon and H.A. Posch, ''Dynamics of threads and polymers in turbulence: powerlaw distributions and synchronization'', J. Stat. Mech., P01022 (2012); arXiv: 1109.6834. (pdf) 

2011  H.A. Posch and H. Bosetti, "Covariant Lyapunov vectors and local exponents", 

2010 
H. Bosetti, H.A. Posch, Ch. Dellago and Wm.G. Hoover, "Timereversal H. Bosetti and H.A. Posch, Covariant Lyapunov vectors for rigid disk systems, 

2009 
D. Mukamel and H.A. Posch, "Soft disks in a narrow channel", J. Stat. Mech.,P03014 (2009). Online at stacks.iop.org/JSTAT/2009/P03014; J. van Meel and H.A. Posch, "Lyapunov instability of rough harddisk fluids", 

2008 
C. Dellago and H.A. Posch, "Realizing Boltzmann's dream: computer simulations in modern statistical mechanics", in Boltzmann's Legacy, edited by Giovanni Gallavotti, Wolfgang L.Reiter and Jakob Yngvasson, European Mathem. Society W.W. Szymanski and H.A. Posch, "Marian Wilhelm Theofil von Smoluchowski" 

2007 
Ch. Marx, H. A. Posch and W. Thirring, "Emergence of order in selection mutation dynamics", Phys. Rev. E 75, 061109 (2007). H. Narnhofer, H.A. Posch and W. Thirring, "Emergence of order in quantum extensions of the classical quasispecies evolution", Phys. Rev. E 76, 

2006 
H. A. Posch and W. Thirring, ”Thermodynamic instability of a confined gas”, H. A. Posch and Wm. G. Hoover, ”Lyapunov instability of classical manybody Wm. G. Hoover, C. G. Hoover, H. A. Posch, and J. A. Codelli, Lj. Milanovic, H. A. Posch, and W. Thirring, "Gravitational collapse and ergodicity in confined gravitational systems", J. of Statistical Physics (2006) DOI:10.1007/s10955 0069095x . 

2005 
H. A. Posch and W. Thirring, "Stellar stability by thermodynamic instability", J.P. Eckmann, Ch. Forster, H. A. Posch, and E. Zabey, "Lyapunov modes in harddisk systems", J. Stat. Phys. 118, 813847 (2005). H. A. Posch and Ch. Forster, "Lyapunov instability of fluids", p. 309346, in 

2004 
Ch. Forster, D. Mukamel, and H. A. Posch, "Dynamical instability in narrow channels", Phys. Rev. E 69, 066124 (2004). Ch. Forster, R. Hirschl, H. A. Posch, and Wm. G. Hoover, “Perturbed phasespace dynamics of harddisk fluids”, Physica D, 187, 294 (2004); arXive:nlin.CD/0211047. H. A. Posch and Wm. G. Hoover,
“Largesystem phasespace dimensionality loss in stationary heat flows”,
Physica D, 187, 281 (2004); 

2003

Ch. Forster, R. Hirschl, and H. A. Posch, “Analysis of Lyapunov modes for harddisk fluids”, Proceedings for the Math.Physics conference, Lissabon, July 2003. W. Thirring, H. Narnhofer and H. A. Posch “Negative specific heat, the thermodynamic limit, and ergodicity”, Phys. Rev. Lett. 91, 130601 (2003.)


2002 
Wm. G. Hoover, H. A. Posch, K. Aoki, and D. Kusnezov, Ch. Dellago, Wm. G. Hoover, and H. A. Posch, "Fluctuations, convergence times, correlation functions, and power laws from manybody Lyapunov spectra for soft and hard disks and sphere", Phys. Ref. E 65, 056216 (2002). H. A. Posch and Ch. Forster, "Lyapunov instability and collective Wm. G. Hoover, H. A. Posch, Ch. Forster, Ch. Dellago, and M. Zhou, LJ. Milanovic and H. A. Posch, "Localized and delocalized modes in the tangentspace dynamics of planar hard dumbbell fluids", J. Molec. Liquids, 9697, 221  244 (2002). H. A. Posch and W. Thirring, “The classical threebody problem  where is abstract mathematics, physical intuition, computational physics most powerful?”, p. 289  305 of Mathematical Physics 2000, edited by A. Fokas, A. Grigoryan, T. Kibble, and B. Zegarlinski, Imperial College Press, 2000. Also in Highlights of Mathematics in Physics, edited by A. Fokas, J. Halliwell, T. Kibble, and B. Zegarlinski, American Mathematical Society, 2002. 

2001 
Wm.
G. Hoover, C.G. Hoover, and H.A. Posch, “Dynamical instabilities, manifolds,
and local Lyapunov spectra far from equilibrium'', Computational Methods
in Science and Technology, 7, 55, (2001).
Wm. G. Hoover, H.A. Posch, and C.G. Hoover, “Fluctuations and asymmetry via local Lyapunov instability in the timereversible doublythermostated harmonic oscillator”, J. Chem. Phys. 115, 5744  5750 (2001). Wm. G. Hoover, C.G. Hoover, and H.A. Posch, “Doublythermostated canonical harmonic oscillator: singularities, local Lyapunov instability spectrum, ergodicity, reversibility”, unpublished 

2000 
S.
Nugent and H. A. Posch, “Simulation of twodimensional drops with smooth
particle applied mechanics”, Phys. Rev. E 62, 4968 (2000).
H. A. Posch and W. Thirring, “Some aspects of the classical threebody problem that are close or foreign to physical intuition”, Journal of Mathematical Physics 41, 3430  3447 (2000). H. A. Posch and W. Thirring, “The classical threebody problem  where is abstract mathematics, physical intuition, computational physics most powerful?”, p. 289  305 of Mathematical Physics 2000, edited by A. Fokas, A. Grigoryan, T. Kibble, and B. Zegarlinski, Imperial College Press, 2000. Also in Highlights of Mathematics in Physics, edited by A. Fokas, J. Halliwell, T. Kibble, and B. Zegarlinski, American Mathematical Society, 2002. H. A. Posch and R. Hirschl, “Simulation of blliards and of hardbody fluids”, pages 269  310 in Hard Ball Systems and the Lorenz Gas, edited by D. Szasz, Encyclopedia of the mathematical sciences 101, Springer Verlag, Berlin (2000). Wm. G. Hoover, H. A. Posch, V. M. Castillo, and C. G. Hoover, “Computer simulation of irreversible expansions via molecular dynamics, smooth paticle applied mechanics, Eulerian, and Lagrangian continuum mechanics”, J. Statist. Physics 100, 313  326, (2000). H. A. Posch, R. Hirschl, and Wm. G. Hoover, “Multifractal phasespace distributions for stationary nonequilibrium systems”, in Dynamics: Models and Kinetic Methods for Nonequilibrium ManyBody Systems, J. Karkheck, ed., NATO ASI Series E: Applied Sciences  Vol. 371, p. 169  189 (Kluwer, Dordrecht, 2000). 

1999 
A.
Torcini, Ch. Dellago, and H.A. Posch, “Comment on: Lyapunov exponent of
a many body system and its transport coefficients”, Phys. Rev. Lett., 83,
2676 (1999).
Wm.G. Hoover and H.A Posch, “Entropy increase in confined free expansions via molecular dynamics and smooth particle applied mechanics”, Phys. Rev. E 59, 1770  1776 (1999). 

1998 
H.A.
Posch and Wm.G. Hoover, “Heat conduction in onedimensional chains and nonequilibrium
Lyapunov spectrum”, Phys. Rev. E, 58, 4344  4350 (1998).
Lj. Milanovic, H.A. Posch, and Wm. G. Hoover, “What is `Liquid'? Understanding the States of Matter”, Molec. Phys., 95, 281  287 (1998). Wm. G. Hoover and H. A. Posch, “Multifractals from stochastic manybody molecular dynamics”, Phys. Lett. A. 246, 247  251 (1998). Lj. Milanovic, H.A. Posch, and Wm. G. Hoover, “Lyapunov instability of twodimensional fluids: hard dumbbells”, Chaos, 8, 455  461 (1998). Wm. G. Hoover and H.A. Posch, “Chaos and irreversibility in simple model systems”, Chaos, 8, 366  373 (1998). Ch. Dellago, W.G. Hoover, and H.A. Posch, “Isomorphic multifractal shear flows and Lyapunov spectra for hard disks via isokinetic and adiabatic nonequilibrium molecular dynamics”, Phys. Rev. E, 57, 4969  4975 (1998). Wm. G. Hoover, Kevin Boercker, and H. A. Posch, “Largesystem hydrodynamic limit for color conductivity in two dimensio”, Phys. Rev. E., 57, 3911  3916 (1998). Lj. Milanovic, H.A. Posch, and W. Thirring, “Statistical mechanics and computer simulation of systems with attractive positive powerlaw potentials”, Phys. Rev. E 57, 2763  2775 (1998). D.J. Evans, D.J. Searles, Wm.G. Hoover, C. G. Hoover, B.L. Holian, H.A. Posch, and G. P. Morriss, “Comment on: Modified nonequilibrium molecular dynamics for fluid flows with energy conservation [J. Chem. Phys. 106, 5615 (1997)]”, J. Chem. Phys., 108, 4351 (1998). W.G. Hoover, D.J. Evans,
H.A. Posch, B.L. Holian, and G.P Morriss, “Comment on: Toward a Statistical
Thermodynamics of Steady States”, Phys. Rev. Lett., 80,
4103  4106 (1998). 

1997 
H.
van Beijeren, J.R. Dorfman, H.A. Posch, and Ch. Dellago,”The KolmogorovSinai
entropy for dilute gases in equilibrium”, Phys. Rev. E 56,
5272  5277 (1997).
H.A. Posch and W.G. Hoover, “Timereversible dissipative attractors in three and four phasespace dimensions”, Phys. Rev. E, 55, 6803  6810 (1997). Ch. Dellago and H.A. Posch, “Lyapunov spectrum and the conjugate pairing rule for a thermostatted random Lorentz gas: numerical simulations”, Phys. Rev. Lett., 78, 211  214 (1997). Ch. Dellago and H. A. Posch, “Lyapunov instability in the extended XYmodel: Equilibrium and nonequilibrium molecular dynamics simulations”, Physica A, 237, 95  112 (1997). Ch. Dellago and H.A. Posch, “Lyapunov instability of the boundarydriven
ChernovLebowitz model for stationary shear flow”, J. Stat. Phys. 88,
825  842 (1997). H.A. Posch and W.G. Hoover, “Simulation of twodimensional Kolmogorov flow with smooth particle applied mechanics”, Physica A, 240, 286  296 (1997). Ch. Dellago and H.A. Posch, “KolmogorovSinai entropy and Lyapunov spectra of a hard sphere gas”, Physica A, 240, 68  83 (1997). 

1996 
W.G.Hoover
and H.A. Posch, “Numerical heat conductivity in smooth particle applied
mechanics”, Phys. Rev E, 54, 5142  5145 (1996).
W.G. Hoover, C.G. Hoover, O. Kum, V.M.Castillo, H.A.Posch, and S. Hess, “Smooth Particle Applied Mechanics”, Computational Methods in Science and Technology, 2, 65  72 (1996). H. van Beijeren, J.R. Dorfman, E.G.D. Cohen, H.A. Posch, and Ch. Dellago, “Lyapunov exponents from kinetic theory for a dilute, fielddriven Lorentz gas”, Phys. Rev. Lett. 77, 1974  1977 (1996). Ch. Dellago, and H.A. Posch, “Lyapunov instability, local curvature and the fluidsolid phase transition in two dimensions”, Physica A, 230, 364  387 (1996). W.G. Hoover, H.A. Posch, Ch. Dellago, O. Kum, C.G. Hoover, A.J. De Groot, and B.L. Holian, “Thermomechanical Particle Simulations”, in Nonlinear Dynamics and Complex Systems, Proceedings of the International Conference held in Zakopane, 1995, edited by E. Infeld, R. Zelanzny, and A. Galkowski, p. 179  197, Cambridge University Press, 1997. W.G. Hoover, O. Kum, and H.A. Posch, “Timereversible dissipative ergodic maps”, Phys. Rev. E 53, 2123  2129 (1996). Borzsak, A. Baranyai, and H.A. Posch, “Correlation regimes in systems of soft spherical particles studied by their Lyapunov exponents”, Physica A 229, 93108 (1996). H.A. Posch, Ch. Dellago, W.G. Hoover, and O. Kum, “Microscopic TimeReversibility and Macroscopic Irreversibility Still a Paradox?”, in Pioneering Ideas for the Physical and Chemical Sciences: Josef Loschmidt's Contributions and Modern Developments in Structural Organic Chemistry, Atomistics, and Statistical Mechanics, W. Fleischhacker and T. Schoenfeld, eds., p. 233  248, Plenum, New York, 1997. Ch. Dellago, H.A. Posch, and W.G.Hoover, “Lyapunov instability of hard disks in equilibrium and nonequilibrium steady states”, Phys. Rev. E 53, 1485  1501 (1996). D.K. Ivanov, H.A. Posch, and Ch. Stumpf, “Statistical measures derived from the correlation integrals of physiological time series”, Chaos 6, 243  253 (1996). I. Borzsak, H. A. Posch, and A. Baranyai, "Lyapunov instability of fluids composed of rigid diatomic molecules", Phys. Rev. E 53, 3694 (1996). 

1995 
Oyeon
Kum, Wlliam G. Hoover, and Harald A. Posch, “Viscous conducting flows with
smooth particle applied mechanics”, Phys. Rev. E 52, 4899
 4908 (1995).
Ch. Dellago, L.Glatz and H.A. Posch, “Lyapunov spectrum of the driven Lorentz gas”, Phys. Rev. E 52, 4817  4826 (1995). Ch. Dellago and H.A. Posch, “Lyapunov exponents of systems with elastic hard collisions”, Phys. Rev. E 52, 2401  2406 (1995). H.A. Posch, W.G. Hoover and O. Kum, “Steadystate shear flows via nonequilibrium molecular dynamics and smooth particle applied mechanics”, Phys. Rev. E 52, 1711  1720 (1995). W.G. Hoover and H.A. Posch, “Largesystem hydrodynamic limit”, Mol. Phys. Report, 10, 70  85 (1995). W.G. Hoover and H.A. Posch, “Shear viscosity via global control of spatiotemporal chaos in twodimensional isoenergetic dense fluids”, Phys. Rev. E 51, 273  279 (1995). 

1994 
W.G. Hoover and H.A. Posch, “SecondLaw irreversibility, and phasespace dimensionality loss, from timereversible nonequilibrium steadystate Lyapunov spectra”, Phys. Rev. E, 49, 1913  1920 (1994).  
1993 
W.
Thirring and H.A. Posch, “Unpredictability of symmetry breaking in a phase
transition”, Phys. Rev. E 48, 4333  4339 (1993).
B.L. Holian, H.A. Posch and W.G. Hoover, “Free energy via thermostatted dynamic potential energy changes”, Phys. Rev. E 47, 3852  3861 (1993). W.G. Hoover, H.A. Posch and L.W. Campbell, “Thermal heat reservoirs via Gauss' principle of least constraint; dissipation, chaos, and phasespace dimensionality loss in onedimensional chains”, Chaos 3, 325  332 (1993) H.A. Posch, H. Narnhofer and W. Thirring, “Condensation phenomena in thermodynamically unstable systems”, Physica A 194, 482  493 (1993). W.G. Hoover, B.L. Holian and H.A. Posch, “Comment I on Possible experiments to check the reality of a nonequilibrium temperature”, Phys. Rev. E 48, 3196  3198 (1993). 

1992 
H.A.
Posch and W.G. Hoover, “Nonequilibrium molecular dynamics of classical fluids”,
in Molecular Liquids: new perspectives in Physics and Chemistry, edited
by Jose J.C.TeixeiraDias, NATOASI Series C: Mathematical & Physical
Sciences (Kluwer Academic Publishers, Dordrecht, 1992), p.527  547.
W.G. Hoover, H.A. Posch and C.G. Hoover, “Fractal dimension of steady nonequilibrium flow”, Chaos 2, 245  252 (1992). 

1991 
H.A.
Posch, H. Narnhofer and W. Thirring, “Externally perturbed unstable systems”,
J. Stat. Physics 65, 555  578, (1991).
W.G. Hoover, E. Craig, H.A. Posch, B.L. Holian and C.G. Hoover, “Heat transfer between two degrees of freedom”, Chaos 1, 343  346, (1991). 

1990 
B.L.
Holian, H.A. Posch and W.G. Hoover, “Nonequilibrium free energy, coarsegraining,
and the Liouville equation”, Phys. Rev A 42, 3196  3206
(1990).
H.A. Posch, H. Narnhofer and W. Thirring, “Dynamics of unstable systems”, Phys. Rev. A 42, 1880  1890 (1990). H.A. Posch, W.G. Hoover and B.L. Holian, “Timereversible molecular motion and macroscopic irreversibility”, Ber. d. Bunsenges. f. Phys. Chem. 94, 250  256 (1990). W.G. Hoover, C.G. Hoover and H.A. Posch, “Lyapunov instability of pendula, chains and strings”, Phys. Rev. A 41, 2999  3004 (1990). H.A. Posch, H. Narnhofer and W. Thirring, “Computer simulation of collapsing systems”, in Microscopic Simulation of Complex Flows, edited by M. Mareschal, NATOASI Series B: Physics (Plenum Press, New York, 1990), p. 241  249. 

1989 
B.L.
Holian, G. Ciccotti, W.G. Hoover and H.A. Posch, “Classical response theory
for timeindependent fields: Consequence of the fractal nonequilibrium distribution
function”, Phys. Rev. A 39, 5414  5421 (1989).
H.A. Posch and W.G. Hoover, “Equilibrium and nonequilibrium Lyapunov spectra for dense fluids and solids”, Phys. Rev. A 39, 2175  2188, (1989 

1988 
W.G.
Hoover,C. G. Tull and H.A. Posch, “Negative Lyapunov exponents for dissipative
systems”, Physics Lett. A 131, 211  215 (1988).
F.J. Vesely and H.A. Posch, “Correlated motion of 2 particles in a fluid I. Stochastic equation of motion”, Molec. Phys., 64, 97  109 (1988). H.A. Posch, and W.G. Hoover, “Lyapunov instability of dense LennardJones fluids”, Phys. Rev. A 38, 473  482 (1988) W.G. Hoover, B. Moran, B.L. Holian, H.A. Posch, “Computer simulation of nonequilibrium processes”, p. 191  194 in Shock waves in condensed matter 1987, edited by S.C.Schmidt and N.C.Holmes (NorthHolland, Amsterdam, 1988). 

1987 
B.L.
Holian, W.G. Hoover and H.A. Posch, “Resolution of Loschmidt's paradox:
The origin of irreversible behavior in reversible atomistic dynamics”, Phys.
Rev. Lett. 59, 10  13 (1987).
W.G. Hoover and H.A. Posch, “Direct measurement of equilibrium and nonequilibrium Lyapunov spectra”, Physics Lett. A 123, 227  230 (1987). W.G. Hoover, H.A.Posch, “Densefluid Lyapunov spectra via constrained molecular dynamics”, J. Chem. Phys. 87, 6665  6670 (1987). W.G. Hoover, H.A. Posch, B.L. Holian, M.J. Gillan, M. Mareschal and C.
Massobrio, “Dissipative irreversibility from Nose’s reversible mechanics”,
Molecular Simulations W.A. Steele and H.A. Posch, “A simulation study of the induced infrared absorption in liquid CO2”, J. Chem. Soc., Faraday Trans. 2 83, 1843  1858 (1987). 

1986 
H.A. Posch, W.G. Hoover and F.J. Vesely, “Canonical dynamics of the Nose oscillator: Stability, order and chaos”, Phys. Rev. A 33, 4253  4265 (1986).  
1981
1985 
W.G.
Hoover and H.A. Posch, “Direct measurement of Lyapunov exponents”, Physics
Lett. A 113, 82  84 (1985).
M. Neumann and H.A. Posch, “Collision induced light scattering from tetrahedral molecules”, in Phenomena induced by intermolecular interactions, G.Birnbaum (ed.), NATO  ASI Series B, Vol. 127, p. Plenum, New York, 1985. W.A. Steele and H.A. Posch, “Liquids and liquid state interactions”, in Phenomena induced by intermolecular interactions, G. Birnbaum (ed.), p. 549  556, NATO – ASI Series B, Vol. 127, Plenum, New York, 1985. H.A. Posch, U. Balucani and R. Vallauri, “On the relative dynamics of pairs of atoms in simple liquids”, Physica A 123, 516  534 (1984). H.A. Posch, “Collision induced light scattering from fluids composed of tetrahedral mokecules III: Neopentane vapour”, Molec. Phys. 46, 1213  1230 (1982). H. Bertagnolli, H.G. Hertz und H.A. Posch, „Mikrodynamische Vorgaenge in Fluessigkeiten“, Ber. Bunseng. f. Phys. Chemie, 85, 992  1004 (1981). H.A. Posch, F.J. Vesely and W.A. Steele, “Atomic pair dynamics in a LennardJones fluid: comparison of theory with computer simulation”, Molec. Phys. 44, 241  264 (1981). 

1976
1980 
H.A.
Posch, “Collision induced light scattering from fluids composed of tetrahedral
molecules II: Intensities”, Molec. Phys. 40, 1137  1152
(1980).
W. Schindler and H.A. Posch, “Rayleigh and Raman light scattering from Pyridine  Water Mixtures”, Chem. Phys. 43, 9  20 (1979). S. C. An, L. Fishman, T.A. Litovitz, C.J. Montrose and H.A. Posch, “Depolarized light scattering from dense noble gases”, J. Chem. Phys., 70, 4626  4632 (1979). P. Froehlich und H.A. Posch, „Eine Hochdruckzelle fuer depolarisierte Lichtstreuexperimente an Fluessigkeiten“, Journal of Physics E 12, 170  172 (1979). H.A. Posch, „Kollisionsinduzierte Lichtstreuung an einfachen atomaren und molekularen Fluessigkeiten“, Acta Physica Austriaca, Supp.XX, 157  166 (1979). H.A. Posch, “Collision induced light scattering from fluids composed of tetrahedral molecules I”, Molec. Phys 37, 1059  1075 (1978). P. Froehlich and H.A. Posch, “Depolarized light scattering in dense liquid quinoline”, Molec. Phys. 36, 1421  1433 (1978). H.A. Posch, H.D. Dardy and T.A. Litovitz, “Depolarized light scattering in hydrogen bonding liquids“, Ber. der Bunseng. f. Phys. Chemie 81, 744  748 (1977). H.A. Posch and T.A. Litovitz, “Depolarized light scattering in liquid SF6 “, Molec. Phys. 32, 1559  1575 (1976). Friedrich Kohler, E. Wilhelm and H. Posch, “Recent advances in the physical chemistry of the liquid state”, Adv. Mol. Rel. Proc. 8, 195  239 (1976). 

1965 1975  L.
Kumer, H. Posch und J. Kaltseis, “Moessbauer effect of Fe  atoms in cationexchanged
zeolite (Type A4)”, Phys. Lett. A 40, 59  60 (1972).
J. Kaltseis, H.A. Posch and W. Vogel, “Moessbauer effect observations with the 46.5 keV line of 183W in anhydrous lithium tungstate“, J. Phys. C: Solid State Phys. 5, 2523  2533 (1972). H. Posch und Friedrich Kohler, „Ultraschalluntersuchungen ueber die Dimerisation von Essigsaeure in Mischungen mit Tetrachlorkohlenstoff“, Monatsh. f. Chemie 98, 1451  1459 (1967). R. Fischer, H. Posch und F. Kohler, „Interferometrische Bestimmung der Ultraschallgeschwindigkeit in binaeren Mischungen von Nichtelektrolyten, 2.Mitt.“, Monatsh. f. Chemie 96, 1865  1873 (1965). 

