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

Autor(es)

Bemfica, Fabio S. ^{[1, 2, 3]} ; Disconzi, Marcelo M. ^[3] ; Noronha, Jorge ^[4]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Physical Review Letters; v. 122, n. 22 JUN 7 2019.
• Citações Web of Science: 2

Resumo

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)

• Processo FAPESP: 17/05685-2 - Física hadrônica em colisões nucleares de altas energias
• Beneficiário: Jun Takahashi
• Modalidade de apoio: Auxílio à Pesquisa - Projetos Especiais