Negative Temperature for Negative Lapse Function
Research output: Contribution to journal › Article › Scientific › peer-review
|Number of pages||4|
|Publication status||E-pub ahead of print - 1 Jan 2019|
|MoE publication type||A1 Journal article-refereed|
- Landau Institute for Theoretical Physics
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.