Vacuum energy sequestering and cosmic dynamics

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Avelino, PP (Author) FCUP

Journal

Title: Physical Review D - Particles, Fields, Gravitation and Cosmology

Vol. 90 No. 4

ISSN: 1550-7998

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 6 Citations

Scopus - 6 Citations

Other information

Authenticus ID: P-009-Z6Y

DOI: 10.1103/physrevd.90.103523

Abstract (EN): We explicitly compute the dynamics of closed homogeneous and isotropic universes permeated by a single perfect fluid with a constant equation-of-state parameter w in the context of a recent reformulation of general relativity, proposed by Kaloper and Padilla [Phys. Rev. Lett. 112, 091304 (2014)], which prevents the vacuum energy from acting as a gravitational source. This is done using an iterative algorithm, taking as an initial guess the background cosmological evolution obtained using standard general relativity in the absence of a cosmological constant. We show that, in general, the impact of the vacuum energy sequestering mechanism on the dynamics of the universe is significant, except for the w = 1/3 case where the results are identical to those obtained in the context of general relativity with a null cosmological constant. We also show that there are well-behaved models in general relativity that do not have a well-behaved counterpart in the vacuum energy sequestering paradigm studied in this paper, highlighting the specific case of a quintessence scalar field with a linear potential.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6