Central equation of state in spherical characteristic evolutions

Journal Article · Thu Oct 15 00:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.084007· OSTI ID:21325351

Barreto, W; Castillo, L; Barrios, E ^[1]

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1. Centro de Fisica Fundamental, Facultad de Ciencias, Universidad de Los Andes, Merida 5101, Estado Merida (Venezuela, Bolivarian Republic of)

We study the evolution of a perfect-fluid sphere coupled to a scalar radiation field. By ensuring a Ricci invariant regularity as a conformally flat spacetime at the central world line we find that the fluid coupled to the scalar field satisfies the equation of state {rho}{sub c}+3p{sub c}=const at the center of the sphere, where the energy {rho}{sub c} density and the pressure p{sub c} do not necessarily contain the scalar field contribution. The fluid can be interpreted as anisotropic and radiant because of the scalar field, but it becomes perfect and nonradiative at the center of the sphere. These results are currently being considered to build up a numerical relativistic hydrodynamic solver.

• OSTI ID: 21325351
• Journal Information: Physical Review. D, Particles Fields, Vol. 80, Issue 8; Other Information: DOI: 10.1103/PhysRevD.80.084007; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANISOTROPY
DENSITY
EQUATIONS OF STATE
EVOLUTION
FLUIDS
RELATIVISTIC RANGE
SCALAR FIELDS
SPACE-TIME
SPHERICAL CONFIGURATION