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Publikace ÚTF

Interpreting A and B metrics with Λ as gravitational field of a tachyon in an (anti–)de Sitter universe

Hruška, O.; Podolský, J.

We investigate the main properties and mutual relations of the so-called A and B metrics with any value
of the cosmological constant. In particular, we explicitly show that both the AII and BI metrics are, in fact,
the famous Schwarzschild–(anti–)de Sitter spacetime (that is the AI metric) boosted to superluminal speed.
Together, they can be combined to form a complete gravitational field of a tachyon in an asymptotically
Minkowski or (anti–)de Sitter background. The boundary separating the AII and BI regions is the MachCherenkov shockwave on which the curvature is unbounded. We analyze various geometric features of
such spacetimes, provide their natural physical interpretation, and visualize them using convenient
background coordinates and embeddings.
typ:article
journal:Phys. Rev. D
volume:99
pages:084037
year:2019
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