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arxiv: 0712.0208 · v3 · submitted 2007-12-03 · 🌀 gr-qc · astro-ph· hep-th

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Global monopole surrounded by quintessence-like matter

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classification 🌀 gr-qc astro-phhep-th
keywords globalquintessence-likemonopoleequationsfieldmattermonopolessince
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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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