Results 21 to 30 of about 72,568 (270)

How many universes are necessary for an ice cream to melt? [PDF]

Serbian Astronomical Journal, 2003
We investigate a quantitative consequence of the Acausal-Anthropic approach to solving the long-standing puzzle of the thermo dynamical arrow of time.
Ćirković Milan M.
doaj   +1 more source

Fluctuation, Dissipation and the Arrow of Time [PDF]

, 2011
The recent development of the theory of fluctuation relations has led to new insights into the ever-lasting question of how irreversible behavior emerges from time-reversal symmetric microscopic dynamics.
Bochkov, Callen, Einstein, Messiah, Michele Campisi, Peter Hänggi, Stratonovich   +6 more
core   +6 more sources

Does a computer have an arrow of time? [PDF]

, 2007
In [Sch05a], it is argued that Boltzmann's intuition, that the psychological arrow of time is necessarily aligned with the thermodynamic arrow, is correct.
Owen J. E. Maroney, L.S. Schulman, S.W. Hawking, L. Boltzmann, H. Reichenbach, P. Horwich, L. Sklar, J. Earman, T. Maudlin, L. Sklar, R. Landauer, S.W. Hawking, S.W. Hawking, D.Z. Albert, L.S. Schulman, H.D. Zeh, L.S. Schulman, T. Short, O.J.E. Maroney, O.J.E. Maroney, C.M. Caves, C.M. Caves, B. Piechocinska, J. Bub, C.H. Bennett, J. Earman, J.D. Norton, S. Turgut, R.C. Tolman, M.H. Partovi, B. Loewer, H. Price   +31 more
core   +1 more source

On Quantum Entropy

Entropy, 2022
Quantum physics, despite its intrinsically probabilistic nature, lacks a definition of entropy fully accounting for the randomness of a quantum state. For example, von Neumann entropy quantifies only the incomplete specification of a quantum state and ...
Davi Geiger, Zvi M. Kedem
doaj   +1 more source

Deflation at Turnaround for Oscillatory Cosmology [PDF]

, 2006
It is suggested that dark energy in a brane world can help reconcile an infinitely cyclic cosmology with the second law of thermodynamics. A cyclic cosmology is described, in which dark energy with constant equation of state leads to a turnaround at ...
Baum, Lauris, Frampton, Paul H.
core   +5 more sources

Multi-Objective Constructal Design for Square Heat-Generation Body with “Arrow-Shaped” High-Thermal-Conductivity Channel

Energies, 2022
Based on the square heat-generation body (HGB) with “arrow-shaped” high-thermal-conductivity channel (HTCC) model established in the previous literature, we performed multi-objective optimization (MOO) with maximum temperature difference (MTD ...
Hongwei Zhu, Lingen Chen, Yanlin Ge, Shuangshuang Shi, Huijun Feng   +4 more
doaj   +1 more source

Cosmological Time, Entropy and Infinity

Entropy, 2017
Time is a parameter playing a central role in our most fundamental modelling of natural laws. Relativity theory shows that the comparison of times measured by different clocks depends on their relative motion and on the strength of the gravitational ...
Clémentine Hauret, Pierre Magain, Judith Biernaux   +2 more
doaj   +1 more source

Vacuum structure for expanding geometry [PDF]

, 1999
We consider gravitational wave modes in the FRW metrics in a de Sitter phase and show that the state space splits into many unitarily inequivalent representations of the canonical commutation relations.
Albrecht A, Alfinito E, Alhassid Y, Boyanowski D, Bratteli O, Celeghini E, De Filippo S, E Alfinito, Eboli O, Eboli O, Feshbach H, G Vitiello, Grishchuk L P, Hawking S W, Hawking S W, Hawking S W, Hawking S W, Johansson A E I, Lindblad G, Martellini M, Misner W, Ojima I, Penrose R, Perelomov A M, Prokopec T, R Manka, Sewell G L, Solomon A I, Takahashi Y, Umezawa H, Umezawa H, Vitiello G, Wald R M, Wald R M   +33 more
core   +3 more sources

Where Was Past Low-Entropy?

Entropy, 2019
Where was the past low-entropy of the early universe located? Contrary to some popular answers, I argue that that the dominant source of low-entropy is the fact that a single degree of freedom, the scale factor, was not at equilibrium.
Carlo Rovelli
doaj   +1 more source

Maxwell’s Demon in Quantum Mechanics

Entropy, 2020
Maxwell’s Demon is a thought experiment devised by J. C. Maxwell in 1867 in order to show that the Second Law of thermodynamics is not universal, since it has a counter-example. Since the Second Law is taken by many to provide an arrow of time, the
Orly Shenker, Meir Hemmo
doaj   +1 more source