Parameter-free velocity-dependent one-scale model for domain walls

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Avelino, PP (Author) FCUP

Journal

Title: Physical Review D

Vol. 101

ISSN: 2470-0010

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 6 Citations

Scopus - 6 Citations

Other information

Authenticus ID: P-00R-KKZ

DOI: 10.1103/physrevd.101.023514

Abstract (EN): We develop a parameter-free velocity-dependent one-scale model for the evolution of the characteristic length L and root-mean-square velocity sigma(v) of standard domain wall networks in homogeneous and isotropic cosmologies. We compare the frictionless scaling solutions predicted by our model, in the context of cosmological models having a power law evolution of the scale factor a as a function of the cosmic time t (a proportional to t(lambda), 0 < lambda < 1), with the corresponding results obtained using field theory numerical simulations. We show that they agree well (within a few %) for root-mean-square velocities sigma(v )smaller than 0.2c (lambda >= 0.9), where c is the speed of light in vacuum, but significant discrepancies occur for larger values of sigma(v) (smaller values of lambda). We identify problems with the determination of L and sigma(v) from numerical field theory simulations which might potentially be responsible for these discrepancies.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7