Slowly rotating gravastars

Beltracchi, Philip; Gondolo, Paolo; Mottola, Emil

doi:10.1103/physrevd.105.024002

Title: Slowly rotating gravastars

Journal Article · Mon Jan 03 00:00:00 EST 2022 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.105.024002· OSTI ID:1874181

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Univ. of Utah, Salt Lake City, UT (United States)
Univ. of Utah, Salt Lake City, UT (United States); Tokyo Institute of Technology (Japan); Univ. of Tokyo (Japan)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of New Mexico, Albuquerque, NM (United States)

We solve Einstein’s equations for slowly rotating gravitational condensate stars (gravastars) up to second order in the rotation by expanding about the spherically symmetric gravastar with de Sitter interior and Schwarzschild exterior matched at their common horizon. Requiring that the perturbations are finite on the null surface reduces the exterior geometry to that of a Kerr black hole, implying that a slowly rotating gravastar cannot be distinguished from a Kerr black hole by any measurement or observation restricted to the macroscopic spacetime exterior to the horizon. Here we determine the interior solution, the surface stress tensor, and the Komar mass and angular momentum localized on the slowly rotating horizon surface. With the interior equation of state fixed at p = –ρ, finite junction conditions on the null horizon surface necessarily lead to an interior solution with a singular core, where the perturbative expansion breaks down. Comparison to other models and implications for more rapidly rotating gravastars are briefly discussed.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: 89233218CNA000001; PHY-2014075; JP18K18764

OSTI ID:: 1874181

Report Number(s):: LA-UR-21-22546; TRN: US2306655

Journal Information:: Physical Review. D., Vol. 105, Issue 2; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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