On spherically symmetric solutions with horizon in model with multicomponent anisotropic fluid

TL;DR

This paper explores a family of spherically symmetric solutions in a multicomponent anisotropic fluid model, revealing conditions for horizons and connections to intersecting black branes, with implications for supergravity and post-Newtonian parameters.

Contribution

It introduces a new class of solutions with horizons in multicomponent anisotropic fluid models, linking them to black branes and supergravity configurations.

Findings

Solutions with horizons for natural number q_s are identified.

Connections to intersecting black branes in supergravity are established.

Post-Newtonian parameters are computed for the solutions.

Abstract

A family of spherically symmetric solutions in the model with m-component anisotropic fluid is considered. The metric of the solution depends on parameters q_s, s = 1,...,m, relating radial pressures and the densities and contains (n -1)m parameters corresponding to Ricci-flat "internal space" metrics and obeying certain m(m-1)/2 ("orthogonality") relations. For q_s = 1 (for all s) and certian equations of state (p_i^s = \pm \rho^s) the metric coincides with the metric of intersecting black brane solution in the model with antisymmetric forms. A family of solutions with (regular) horizon corresponding to natural numbers q_s = 1,2,... is singled out. Certain examples of "generalized simulation" of intersecting M-branes in D=11 supergravity are considered. The post-Newtonian parameters \beta and \gamma corresponding to the 4-dimensional section of the metric are calculated.