Domain walls and other defects in Eddington-inspired Born-Infeld gravity

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

Authors

Avelino, PP (Author) FCUP; Sousa, L (Author) Other

Journal

Title: Physical Review D

Vol. 102

ISSN: 2470-0010

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Other information

Authenticus ID: P-00T-1J3

DOI: 10.1103/physrevd.102.104021

Abstract (EN): We investigate domain wall and other defect solutions in the weak-field limit of Eddington-inspired Born-Infeld gravity as a function of kappa, the only additional parameter of the theory with respect to general relativity. We determine, both analytically and numerically, the internal structure of domain walls, quantifying its dependency on kappa as well as the impact of such dependency on the value of the tension measured by an outside observer. We find that the pressure in the direction perpendicular to the domain wall can be, in contrast to the weak-field limit of general relativity, significantly greater or smaller than zero, depending, respectively, on whether kappa is positive or negative. We further show that the generalized von Laue condition, which states that the average value of the perpendicular pressure is approximately equal to zero in the weak-field limit of general relativity, does not generally hold in Eddington-inspired Born-Infeld gravity not only for domain walls, but also in the case of cosmic strings and spherically symmetric particles. We argue that a violation of the generalized von Laue condition should, in general, be expected in any theory of gravity whenever geometry plays a significant role in determining the defect structure.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9