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Evolution of spherical domain walls in solitonic symmetron models

M. Peyravi, N. Riazi, F. S. N. Lobo

Abstract
In this work, inspired by the symmetron model, we analyze the evolution of spherical domain walls by considering specific potentials that ensure symmetry breaking and the occurrence of degenerate vacua that are necessary for the formation of domain walls. By considering a simple analytical model of spherical domain-wall collapse in vacuum, it is shown that this model fits the more accurate numerical results very well until full collapse, after which oscillations and scalar radiation take place. Furthermore, we explore the effect of a central nonrelativistic matter lump on the evolution of a spherical domain wall and show that the central lump can prevent the full collapse and annihilation of the domain-wall bubble, due to the repulsion between the domain wall and matter overdensity within the adopted symmetron-inspired model.

Keywords
General Relativity and Quantum Cosmology; Astrophysics - High Energy Astrophysical Phenomena; High Energy Physics - Theory

Physical Review D
Volume 95, Issue 6
2017 March

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Fundação para a Ciência e a Tecnologia
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