Neutron star evolution with the Bemfica-Disconzi-Noronha-Kovtun viscous hydrodynamics framework
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866915951283273728 |
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| author | Shum, Harry L. H. Abalos, Fernando Bea, Yago Bezares, Miguel Figueras, Pau Palenzuela, Carlos |
| author_facet | Shum, Harry L. H. Abalos, Fernando Bea, Yago Bezares, Miguel Figueras, Pau Palenzuela, Carlos |
| contents | The recently proposed first-order viscous relativistic hydrodynamics formulation by Bemfica, Disconzi, Noronha, and Kovtun (commonly known as the BDNK formulation) has been shown to be causal, stable, strongly hyperbolic, and thus locally well-posed. It is now a viable new option for modelling out-of-equilibrium effects in fluids, and has attracted wide attention in its potential applications to astrophysical systems. In this work, we present the first non-linear numerical simulation of spherically symmetric neutron stars using the BDNK formulation under the Cowling approximation. Using a simplified equation of state, we show that stable evolutions can be constructed within a restricted parameter space up to the simulation time we explored. From these simulations, we analyse the frequency content of the quasi-normal modes and the decay rate of the fundamental mode. This analysis serves as a first step towards constructing a fully consistent model of neutron stars using the BDNK formulation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_15303 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Neutron star evolution with the Bemfica-Disconzi-Noronha-Kovtun viscous hydrodynamics framework Shum, Harry L. H. Abalos, Fernando Bea, Yago Bezares, Miguel Figueras, Pau Palenzuela, Carlos General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena Nuclear Theory The recently proposed first-order viscous relativistic hydrodynamics formulation by Bemfica, Disconzi, Noronha, and Kovtun (commonly known as the BDNK formulation) has been shown to be causal, stable, strongly hyperbolic, and thus locally well-posed. It is now a viable new option for modelling out-of-equilibrium effects in fluids, and has attracted wide attention in its potential applications to astrophysical systems. In this work, we present the first non-linear numerical simulation of spherically symmetric neutron stars using the BDNK formulation under the Cowling approximation. Using a simplified equation of state, we show that stable evolutions can be constructed within a restricted parameter space up to the simulation time we explored. From these simulations, we analyse the frequency content of the quasi-normal modes and the decay rate of the fundamental mode. This analysis serves as a first step towards constructing a fully consistent model of neutron stars using the BDNK formulation. |
| title | Neutron star evolution with the Bemfica-Disconzi-Noronha-Kovtun viscous hydrodynamics framework |
| topic | General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena Nuclear Theory |
| url | https://arxiv.org/abs/2509.15303 |