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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Causality of the Einstein-Israel-Stewart Theory with Bulk Viscosity

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Author(s):
Bemfica, Fabio S. [1, 2, 3] ; Disconzi, Marcelo M. [3] ; Noronha, Jorge [4]
Total Authors: 3
Affiliation:
[1] Univ Fed Rio Grande do Norte, Escola Ciencias & Tecnol, BR-59072970 Natal, RN - Brazil
[2] Vanderbilt Univ, 221 Kirkland Hall, Nashville, TN 37235 - USA
[3] Vanderbilt Univ, Dept Math, Nashville, TN 37211 - USA
[4] Univ Sao Paulo, Inst Fis, Rua Matao 1371, BR-05508090 Sao Paulo, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Physical Review Letters; v. 122, n. 22 JUN 7 2019.
Web of Science Citations: 2
Abstract

We prove that Einstein's equations coupled to equations of the Israel-Stewart-type, describing the dynamics of a relativistic fluid with bulk viscosity and nonzero baryon charge (without shear viscosity or baryon diffusion) dynamically coupled to gravity, are causal in the full nonlinear regime. We also show that these equations can be written as a fast-order symmetric hyperbolic system, implying local existence and uniqueness of solutions to the equations of motion. We use an arbitrary equation of state and do not make any simplifying symmetry or near-equilibrium assumption, requiring only physically natural conditions on the fields. These results pave the way for the inclusion of bulk viscosity effects in simulations of gravitational-wave signals coming from neutron star mergers. (AU)

FAPESP's process: 17/05685-2 - Hadronic physics in high energy nuclear collisions
Grantee:Jun Takahashi
Support type: Research Projects - Thematic Grants