Does the second law hold at cosmic scales?
classification
🌌 astro-ph.CO
gr-qc
keywords
scalescaseholdsecondtextemdashanalysisbeenblack
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The second law of thermodynamics is known to hold at small scales also when gravity plays a leading role, as in the case of black holes and self-gravitating radiation spheres. It has been suggested that it should as well at large scales. Here, by a purely kinematic analysis \textemdash based on the history of the Hubble factor and independent of any cosmological model \textemdash , we explore if this law is fulfilled in the case of homogeneous and isotropic universes regardless of the sign of the spatial curvature.
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