A Physical Interpretation of Gravitational Field Equations

T. Padmanabhan

A Physical Interpretation of Gravitational Field Equations

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arxiv 0911.1403 v1 pith:JB6OI6OI submitted 2009-11-07 gr-qc astro-ph.COhep-th

T. Padmanabhan This is my paper · ORCID

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keywords equationsfieldgravitationalinterpretationanotherapproachderivingdiffeomorphism

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It is possible to provide a thermodynamic interpretation for the field equations in any diffeomorphism invariant theory of gravity. This insight, in turn, leads us to the possibility of deriving the gravitational field equations from another variational principle without using the metric as a dynamical variable. I review this approach and discuss its implications.

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First Law of Thermodynamics and Emergence of Cosmic Space in a Non-Flat Universe
gr-qc 2019-08 conditional novelty 5.0 of 10

In a non-flat Friedmann universe, the unified first law dE = TdS + WdV and the energy-flux form -dE = TdS are consistent only when the horizon volume is taken as the areal volume, not the proper invariant volume.

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