Scalar field, nonminimal coupling, and cosmology
Journal Article
·
· Physical Review, D (Particles Fields); (United States)
- Institute for Theoretical Physics, University of Warsaw, Warsaw (Poland) International Center for Relativistic Astrophysics, Dipartimento di Fisica, Universita di Roma La Sapienza,'' Rome (Italy)
- Dipartimento di Scienze Fisiche (Universita di Napoli) Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Mostra d'Oltremare, pad. 19, 80125 Napoli (Italy)
We study the dynamics of a flat Friedmann-Robertson-Walker universe filled with a self-interacting scalar field nonminimally coupled to the gravitational field. Dynamical equations for the system can be derived from a pointlike Lagrangian. For this system an additional Noether symmetry exists provided that the coupling constant {xi} is equal to 0 or 1/6. When {xi}=1/6 the scalar potential has to be constant. In this case we obtain an exact solution. We also analyze the behavior of the scalar field when {xi}{ne}0, 1/6. Most of the considered solutions are unphysical but there exists a very interesting case in which the effective cosmological constant is rapidly changing, which might lead to inflation.
- OSTI ID:
- 5994435
- Journal Information:
- Physical Review, D (Particles Fields); (United States), Vol. 44:10; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMOLOGY
SCALAR FIELDS
CONFORMAL INVARIANCE
COUPLING CONSTANTS
GRAVITATIONAL FIELDS
KLEIN-GORDON EQUATION
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661310* - Relativity & Gravitation- (1992-)
662110 - General Theory of Particles & Fields- Theory of Fields & Strings- (1992-)
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMOLOGY
SCALAR FIELDS
CONFORMAL INVARIANCE
COUPLING CONSTANTS
GRAVITATIONAL FIELDS
KLEIN-GORDON EQUATION
LAGRANGIAN FUNCTION
SYMMETRY
DIFFERENTIAL EQUATIONS
EQUATIONS
FUNCTIONS
INVARIANCE PRINCIPLES
PARTIAL DIFFERENTIAL EQUATIONS
WAVE EQUATIONS
661310* - Relativity & Gravitation- (1992-)
662110 - General Theory of Particles & Fields- Theory of Fields & Strings- (1992-)