Results 51 to 60 of about 3,512,353 (267)
Asymmetric energy transfers in driven nonequilibrium systems and arrow of time [PDF]
European Physical Journal B : Condensed Matter Physics, 2019 Fundamental interactions are either fully or nearly symmetric under time reversal. But macroscopic phenomena may have a definite arrow of time. From the perspectives of statistical physics, the direction of time is towards increasing entropy.
M. Verma
semanticscholar +1 more source
Arrows of Time and Chaotic Properties of the Cosmic Background Radiation [PDF]
J.Phys.A35:7243-7254,2002, 2002 We advance a new viewpoint on the connection between the the thermodynamical and cosmological arrows of time, which can be traced via the properties of Cosmic Microwave Background (CMB) radiation. We show that in the Friedmann-Robertson-Walker Universe with negative curvature there is a necessary ingredient for the existence of the thermodynamical ...
arxiv +1 more source
Revisiting the Origin of the Universe and the Arrow of Time [PDF]
arXiv, 2021 We reconsider the old but yet unsolved problems, origin of the universe and the arrow of time. We show that only the closed universe is free from the singularity with the arrow of time symmetric with respect to the maximal size of the cosmic scale. The Wheeler-DeWitt equation is explicitly solved to obtain the local dynamical times.
arxiv
Arrows of Time in the Bouncing Universes of the No-boundary Quantum State [PDF]
Phys. Rev. D, 85, 103524 (2012), 2011 We derive the arrows of time of our universe that follow from the no-boundary theory of its quantum state (NBWF) in a minisuperspace model. Arrows of time are viewed four-dimensionally as properties of the four-dimensional Lorentzian histories of the universe. Probabilities for these histories are predicted by the NBWF.
arxiv +1 more source
Characterizing a Statistical Arrow of Time in Quantum Measurement Dynamics. [PDF]
Physical Review Letters, 2018 In both thermodynamics and quantum mechanics, the arrow of time is characterized by the statistical likelihood of physical processes. We characterize this arrow of time for the continuous quantum measurement dynamics of a superconducting qubit.
P. M. Harrington +4 more
semanticscholar +1 more source
The Importance of Boundary Conditions in Quantum Mechanics [PDF]
, 2003 We discuss the role of boundary conditions in determining the physical content of the solutions of the Schrodinger equation. We study the standing-wave, the ``in,'' the ``out,'' and the purely outgoing boundary conditions. As well, we rephrase Feynman's $
A. F. J. Siegert +16 more
core +3 more sources
Arrow(s) of Time without a Past Hypothesis [PDF]
, 2019 The paper discusses recent proposals by Carroll and Chen, as well as Barbour, Koslowski, and Mercati to explain the (thermodynamic) arrow of time without a Past Hypothesis, i.e., the assumption of a special (low-entropy) initial state of the universe ...
Lazarovici, Dustin, Reichert, Paula
core +3 more sources
A Lenient Causal Arrow of Time? [PDF]
Entropy, 2018 One of the basic assumptions underlying Bell’s theorem is the causal arrow of time, having to do with temporal order rather than spatial separation. Nonetheless, the physical assumptions regarding causality are seldom studied in this context, and often ...
N. Argaman
semanticscholar +1 more source
Vacuum Structure and the Arrow of Time
, 2012 We find ourselves in an extended era of entropy production. Unlike most other observations, the arrow of time is usually regarded as a constraint on initial conditions. I argue, however, that it primarily constrains the vacuum structure of the theory.
A. Linde +4 more
core +2 more sources
Journal of Modern Physics, 2014 The arrow of time is one of the most difficult questions in modern physics. In this paper, a damping vibration equation is discussed, which shows that this equation reflects the arrow of time. We have further discussed that the concept of “the arrow of time” in this equation is quite different from the thermodynamic arrow.
Peng Zhang, Tsao Chang, Kangjia Liao
openaire +3 more sources