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• W1569394603 abstract "To clarify observational consequence of bubble nucleations in inflationary era, we analyse dynamics of a spherical domain wall in an expanding universe. We consider a spherical shell of the domain wall with tension $sigma$ collapsing in a spherically-symmetric dust universe, which is initially separated into the open Friedmann-Lema^itre-Robertson-Walker universe inside the shell and the Einstein-de Sitter universe outside. The domain wall shell collapses due to the tension, and sweeps the dust fluid. The universe after the collapse becomes inhomogeneous and is described by the Lema^itre-Tolman-Bondi model. We construct solutions describing this inhomogeneous universe by solving dynamical equations obtained from Israel's junction conditions applied to this system. We find that a black hole forms after the domain wall collapse for any initial condition, and that the black hole mass at the moment of its formation is universally given by $M_{rm BH}simeq 17 sigma/H_{rm hc}$, where $H_{rm hc}$ is the Hubble parameter at the time when the shell radius becomes equal to the Hubble radius. We also find that the dust fluid is distributed as $rhopropto R^{3/2}$ near the central region after the collapse, where $R$ is the area radius. These features would provide observable signatures of a spherical domain wall generated in the early universe." @default.
• W1569394603 created "2016-06-24" @default.
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• W1569394603 date "2015-07-08" @default.
• W1569394603 modified "2023-10-01" @default.
• W1569394603 title "Spherical domain wall collapse in a dust universe" @default.
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• W1569394603 doi "https://doi.org/10.1088/0264-9381/32/15/155003" @default.
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