Global monopole surrounded by quintessence-like matter

Details Global monopole surrounded by quintessence-like matter Global monopole surrounded by quintessence-like matter

2007-12-03

arxiv.org/abs/0712.0208v3

Phys.Lett.B666:125-130,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, 8 figures, added discussion and some references, the form accepted for publication in Physics Letter B

Scientific paper

10.1016/j.physletb.2008.06.069

We present new static spherically-symmetric solutions of Einstein equations with the quintessence-like matter surrounding a global monopole. These new solutions of the coupling scalar-Einstein equations are more complicated, which depend on the parameter of equation of state $-1 < w_{q} <-{1/3}$. A gravitating global monopole produces a gravitational field of de Sitter kind outside the core in addition to a solid angular deficit. In the $w_{q} = -{1/3}$ case, we have proved that the solution cannot exist since the density of quintessence-like tends to zero if $w_{q} \to -{1/3}$. As a new feature, these monopoles have the outer horizon depending on both Goldstone field and quintessence-like. Since current observations constrain $-1.14 < w_{q} < -0.93$, new global monopoles have interesting astrophysical applications.

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