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Negative Temperature for Negative Lapse Function

  • G. E. Volovik
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Abstract

Fermion dynamics distinguishes spacetimes having the same metric gμν, but different tetrads eμa, and in particular, it distinguishes a lapse with negative sign, N < 0 (M. Christodoulou, A. Riello, and C. Rovelli, Int. J. Mod. Phys. D 21, 1242014 (2012)). Here we show that the quasiequilibrium thermodynamic state may exist, in which the region with N < 0 has negative local temperature T (r) < 0, while the global Tolman temperature T0 remains positive. For bosons, only N2 matters. However, if bosons are composite, they may inherit the negative T (r) from the fermions, and thus they may distinguish the spacetimes with positive and negative lapse functions via thermodynamics.

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Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  1. 1.Low Temperature LaboratoryAalto University, School of Science and TechnologyAaltoFinland
  2. 2.Landau Institute for Theoretical Physics RASMoscowRussia

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