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Author Avelino, P. P. ♦ Martins, C. J. A. P. ♦ Sousa, L.
Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2008-05-27
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Astronomy & allied sciences ♦ Physics
Subject Keyword Astrophysics ♦ General Relativity and Quantum Cosmology ♦ High Energy Physics - Phenomenology ♦ High Energy Physics - Theory ♦ physics:astro-ph ♦ physics:gr-qc ♦ physics:hep-ph ♦ physics:hep-th
Abstract We study the evolution of biased domain walls in the early universe. We explicitly discuss the roles played by the surface tension and volume pressure in the evolution of the walls, and quantify their effects by looking at the collapse of spherical wall solutions. We then apply our results to a particular mechanism, known as the devaluation scenario, in which the dynamics of biased domain walls was suggested as a possible solution to the cosmological constant problem. Our results indicate that devaluation will in general lead to values of the cosmological constant that differ by several orders of magnitude from the observationally inferred value, $\rho^{1/4}_{vac}\sim10^{-3} \rm eV$. We also argue that the reasons behind this are not specific to a particular realization, and are expected to persist in any scenario of this kind, except if a low energy cut-off on the spectra of vacuum energy densities, of the order of the critical density at the present time, is postulated. This implies that any such scenario will require a fine-tuning similar to the usual one.
Description Reference: Phys.Rev.D78:043521,2008
Educational Use Research
Learning Resource Type Article
Page Count 8


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