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Asymmetric dark stars and neutron star stability

Gresham, Moira I. and Zurek, Kathryn M. (2019) Asymmetric dark stars and neutron star stability. Physical Review D, 99 (8). Art. No. 083008. ISSN 2470-0010. doi:10.1103/physrevd.99.083008.

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We consider gravitationally bound states of asymmetric dark matter (ADM stars), and the impact of ADM capture on the stability of neutron stars. We derive and interpret the equation of state for ADM with both attractive and repulsive interactions, and solve the Tolman-Oppenheimer-Volkoff equations to find equilibrium sequences and maximum masses of ADM stars. Gravitational wave searches can utilize our solutions to model exotic compact objects (ECOs). Our results for attractive interactions differ substantially from those in the literature, where fermionic ADM with attractive self-interactions was employed to destabilize neutron stars more effectively than noninteracting fermionic ADM. By contrast, we argue that fermionic ADM with an attractive force is no more effective in destabilizing neutron stars than fermionic ADM with no self-interactions.

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Additional Information:Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. (Received 23 October 2018; published 12 April 2019) We thank Hou Keong (Tim) Lou for prior collaboration and Daniel Egaña for comments on a draft. M. G. is supported by the NSF under Grant No. 1719780. K. Z. is supported by the DoE under Contract No. DE-AC02-05CH11231.
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Department of Energy (DOE)DE-AC02-05CH11231
Issue or Number:8
Record Number:CaltechAUTHORS:20190613-164152123
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96439
Deposited By: George Porter
Deposited On:18 Jun 2019 23:11
Last Modified:16 Nov 2021 17:20

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