Stability of mass varying particle lumps

• Type: Article in International Scientific Journal
• Date: 2009

Authors

bernardini, ae (Author) Other; bertolami, o (Author) Other

Journal

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

Vol. 80

ISSN: 1550-7998

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 13 Citations

Scopus - 14 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-003-E5W

DOI: 10.1103/physrevd.80.123011

Abstract (EN): The theoretical description of compact structures that share some features with mass varying particles allows for a simple analysis of the equilibrium and stability for massive stellar bodies. We investigate static, spherically symmetric solutions of Einstein equations for a system composed by nonbaryonic matter (neutrinos or dark matter) which forms stable structures through attractive forces mediated by a background scalar field (dark energy). Assuming that the dark matter, or massive neutrinos, consists of a gas of weakly interacting particles, the coupling with the scalar field is translated into an effective dependence of the mass of the compounding particle on the radial coordinate of the curved spacetime. The stability analysis reveals that these static solutions become dynamically unstable for different Buchdahl limits of the ratio between the total mass energy and the stellar radius, M/R. We also find regular solutions that for an external observer resemble Schwarzschild black holes. Our analysis leaves unanswered the question whether such solutions, which are both regular and stable, do exist.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11