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Is Time's Arrow Perspectival? · Around

2015

Is Time's Arrow Perspectival?

Rovelli, Carlo

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Understand

We observe entropy decrease towards the past.

Does this imply that in the past the world was in a non-generic microstate? I point out an alternative.
The subsystem to which we belong interacts with the universe via a relatively small number of quantities, which define a coarse graining.
Entropy happens to depends on coarse-graining.

Built on

Cambridge University Pres, 1979
R. Penrose, “Singularities and Time-Asymmetry,” in General Relativity: An Einstein Centenary Survey · 1979
Earlier work this paper cites.
O. E. Lanford, “The hard sphere gas in the Boltzmann–Grad limit,” Physica
1981
Earlier work this paper cites.
J. Lebowitz, “Boltzmann’s entropy and time’s arrow,” Phys. Today
1993
Earlier work this paper cites.
Oxford University Press, 1996
H. Price, Time’s Arrow · 1996
Earlier work this paper cites.

Similar

Oxford University Press, 2007
J. Ismael, The Situated Self · 2007
Cited alongside, same era.
J. Uffink and G. Valente, “Time’s arrow and Lanford’s theorem,” Seminaire Poincare ́ XV Le Temps
2010
Cited alongside, same era.
Oxford University Press, 2011
H. Price, Naturalism without Mirrors · 2011
Cited alongside, same era.
Cambridge Univeristity Press, 2012
M. Hemmo and O. R. Shenker, The Road to Maxwell’s Demon. Conceptual Foundations of Statistical Mechanics · 2012
Cited alongside, same era.
S. M. Carroll and H. Tam, “Unitary Evolution and Cosmological Fine-Tuning,” arXiv:1007.1417
Original
Cited in the paper.
T. Josset, G. Chirco, and C. Rovelli, “Statistical mechanics of reparametrization invariant systems. Takes Three to Tango,” arXiv:1503.08725
Original
Cited in the paper.

Then

M. Tegmark, “How unitary cosmology generalizes thermodynamics and solves the inflationary entropy problem,” Physical Review D
Original
2012
Later among the works it cites.
H. M. Haggard and C. Rovelli, “Death and resurrection of the zeroth principle of thermodynamics,” Journal of Modern Physics D
Original
2013
Later among the works it cites.
J. M. Deutsch, H. Li, and A. Sharma, “Microscopic origin of thermodynamic entropy in isolated systems,” Physical Review E
Original
2013
Later among the works it cites.

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