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Thermodynamics without Time

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arxiv 2409.19098 v1 pith:ZYJ3MD5O submitted 2024-09-27 physics.hist-ph gr-qcquant-ph

classification physics.hist-phgr-qcquant-ph
keywords quantumtheorythermodynamicsgravitytimeconstructioncovariantrelation
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Our fundamental theories, i.e., the quantum theory and general relativity, are invariant under time reversal. Only when we treat system from the point of view of thermodynamics, i.e., averaging between many subsystem components, an arrow of time emerges. The relation between thermodynamic and the quantum theory has been fertile, deeply explored and still a source of new investigations. The relation between the quantum theory and gravity, while it has not yet brought an established theory of quantum gravity, has certainly sparkled in depth analysis and tentative new theories. On the other hand, the connection between gravity and thermodynamics is less investigated and more puzzling. I review a selection of results in covariant thermodynamics, such as the construction of a covariant notion of thermal equilibrium by considering tripartite systems. I discuss how such construction requires a relational take on thermodynamics, similarly of what happens in the quantum theory and in gravity

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. The Toll of the Tolman Effect: On the Status of Classical Temperature in General Relativity

    physics.hist-ph 2025-07 conditional novelty 6.0 of 10

    The paper argues that the Tolman effect fragments the concept of temperature into at least three incompatible notions, mirroring the fragmentation of time in general relativity.

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