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Comment to the CPT-Symmetric Universe: Two Possible Extensions

2019; Pleiades Publishing; Volume: 109; Issue: 10 Linguagem: Inglês

10.1134/s0021364019100023

1090-6487

G. E. Volovik,

Noncommutative and Quantum Gravity Theories

In Ref. 1 the antispacetime Universe was suggested as the analytic continuation of our Universe across the Big Bang singularity in conformal time.We consider two different scenarios of analytic continuation.In one of them the analytic continuation is extended to the temperature of the system.This extension suggests that if such analytic continuation is valid, then it is possible that the initial stage of the evolution of the Universe on our side of the Big Bang was characterized by the negative temperature.In the second scenario, the analytic continuation is considered in the proper time.In this scenario the Big Bang represents the bifurcation point at which the Z2 symmetry between the spacetime and antispacetime is spontaneously broken.