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• W4313663783 abstract "Abstract We present the derivation of hydrodynamical equations for a perfect fluid in General Relativity, within the <?CDATA $3+1$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mn>3</mml:mn> <mml:mo>+</mml:mo> <mml:mn>1</mml:mn> </mml:math> decomposition of spacetime framework, using only primitive variables. Primitive variables are opposed to conserved variables, as defined in the widely used Valencia formulation of the same hydrodynamical equations. The equations are derived in a covariant way, so that they can be used to describe any configuration of the perfect fluid. Once derived, the equations are tested numerically. We implement them in an evolution code for spherically symmetric self-gravitating compact objects. The code uses pseudospectral methods for both the metric and the hydrodynamics. First, convergence tests are performed, then the frequencies of radial modes of polytropes are recovered with and without the Cowling approximation, and finally the performance of our code in the black hole collapse and migration tests are described. The results of the tests and the comparison with a reference core-collapse and neutron star oscillations code suggests that not only our code can handle very strong gravitational fields, but also that this new formulation helps gaining a significant amount of computational time in hydrodynamical simulations of smooth flows in General Relativity." @default.
• W4313663783 created "2023-01-07" @default.
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• W4313663783 date "2023-04-14" @default.
• W4313663783 modified "2023-09-30" @default.
• W4313663783 title "A new formulation of general-relativistic hydrodynamic equations using primitive variables" @default.
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• W4313663783 doi "https://doi.org/10.1088/1361-6382/acc828" @default.
• W4313663783 hasPublicationYear "2023" @default.
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