Analytical Scaling Solutions for the Evolution of Cosmic Domain Walls in a Parameter-Free Velocity-Dependent One-Scale Model

• Tipo: Artigo em Revista Científica Internacional
• Data: 2022

Autores

Avelino, PP (Autor) FCUP; Gruber, D (Autor) Outra; Sousa, L (Autor) Outra

Revista

Título: Symmetry

Vol. 105

Página Final: 1799

ISSN: 2073-8994

Editora: MDPI

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 1 Citação

Outras Informações

ID Authenticus: P-00X-8C9

DOI: 10.3390/sym14091799

Abstract (EN): We derive an analytical approximation for the linear scaling evolution of the characteristic length L and the root-mean-squared velocity o of standard frictionless domain wall networks in Friedmann-Lemaitre-Robertson-Walker universes with a power law evolution of the scale factor a with the cosmic time t (a proportional to t(lambda)). This approximation, obtained using a recently proposed parameter-free velocity-dependent one-scale model for domain walls, reproduces well the model predictions for lambda close to unity, becoming exact in the lambda -> 1(-) limit. We use this approximation, in combination with the exact results found for lambda = 0, to obtain a fit to the model predictions valid for lambda is an element of [0, 1] with a maximum error of the order of 1%. This fit is also in good agreement with the results of field theory numerical simulations, especially for lambda is an element of [0.9, 1]. Finally, we explicitly show that the phenomenological energy-loss parameter of the original velocity-dependent one-scale model for domain walls vanishes in the lambda -> 1(-) limit and discuss the implications of this result.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 15