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VOLUME 109 (2019) | ISSUE 8 | PAGE 509
Two roads to antispacetime in distorted B-phase of 3He
We consider the emergent tetrad gravity and the analog of antispacetime realized in the recent experiments on the composite defects in superfluid 3He (J.T. Mäkinen, et al., Nat. Comm. 10, 237 (2019)): the Kibble walls bounded by strings (the half quantum vortices). The antispacetime can be reached in two different ways: by the "safe" route around the Alice string or by dangerous route across the Kibble wall. This consideration also suggests the scenario of the formation of the discrete symmetry - the parity P in Dirac equations - from the continuous symmetry existing on the more fundamental level.