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Formulating bulk viscosity for neutron star simulations

Formulating bulk viscosity for neutron star simulations
Formulating bulk viscosity for neutron star simulations

In order to extract the precise physical information encoded in the gravitational and electromagnetic signals from powerful neutron-star merger events, we need to include as much of the relevant physics as possible in our numerical simulations. This presents a severe challenge, given that many of the involved parameters are poorly constrained. In this paper we focus on the role of nuclear reactions. Combining a theoretical discussion with an analysis connecting to state-of-the-art simulations, we outline multiple arguments that lead to a reactive system being described in terms of a bulk viscosity. The results demonstrate that in order to properly account for nuclear reactions, future simulations must be able to handle different regimes where rather different assumptions/approximations are appropriate. We also touch upon the link to models based on the large-eddy-strategy required to capture turbulence.

2470-0010
Celora, T.
b15e9792-aae0-479a-83c5-b5c874b19fa6
Hawke, I.
fc964672-c794-4260-a972-eaf818e7c9f4
Hammond, P. C.
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Andersson, N.
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Comer, G. L.
734e606a-fbae-4765-b778-4f2d844eb9f4
Celora, T.
b15e9792-aae0-479a-83c5-b5c874b19fa6
Hawke, I.
fc964672-c794-4260-a972-eaf818e7c9f4
Hammond, P. C.
2bd2a2cc-4d3a-40d9-a86f-c1f2aac935be
Andersson, N.
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Comer, G. L.
734e606a-fbae-4765-b778-4f2d844eb9f4

Celora, T., Hawke, I., Hammond, P. C., Andersson, N. and Comer, G. L. (2022) Formulating bulk viscosity for neutron star simulations. Physical Review D, 105 (10), [103016]. (doi:10.1103/PhysRevD.105.103016).

Record type: Article

Abstract

In order to extract the precise physical information encoded in the gravitational and electromagnetic signals from powerful neutron-star merger events, we need to include as much of the relevant physics as possible in our numerical simulations. This presents a severe challenge, given that many of the involved parameters are poorly constrained. In this paper we focus on the role of nuclear reactions. Combining a theoretical discussion with an analysis connecting to state-of-the-art simulations, we outline multiple arguments that lead to a reactive system being described in terms of a bulk viscosity. The results demonstrate that in order to properly account for nuclear reactions, future simulations must be able to handle different regimes where rather different assumptions/approximations are appropriate. We also touch upon the link to models based on the large-eddy-strategy required to capture turbulence.

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Accepted/In Press date: 26 April 2022
Published date: 16 May 2022
Additional Information: Funding Information: We are grateful for support from Science and Technology Facilities Council (STFC) via Grants No. ST/R00045X/1 and No. ST/V000551/1. Publisher Copyright: © 2022 American Physical Society.

Identifiers

Local EPrints ID: 468317
URI: http://eprints.soton.ac.uk/id/eprint/468317
ISSN: 2470-0010
PURE UUID: 57a10618-19c8-4aa3-949c-19234578d4af
ORCID for T. Celora: ORCID iD orcid.org/0000-0002-6515-3644
ORCID for I. Hawke: ORCID iD orcid.org/0000-0003-4805-0309
ORCID for P. C. Hammond: ORCID iD orcid.org/0000-0002-9447-1043
ORCID for N. Andersson: ORCID iD orcid.org/0000-0001-8550-3843

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Date deposited: 10 Aug 2022 16:35
Last modified: 02 Sep 2022 01:57

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Contributors

Author: T. Celora ORCID iD
Author: I. Hawke ORCID iD
Author: P. C. Hammond ORCID iD
Author: N. Andersson ORCID iD
Author: G. L. Comer

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