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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/132335
Title: 
Scalar field description of decaying-Lambda cosmologies
Author(s): 
Institution: 
  • Universidade Estadual Paulista (UNESP)
  • Universidade de São Paulo (USP)
  • Universidade Federal do Rio Grande do Norte (UFRN)
ISSN: 
0556-2821
Abstract: 
The conditions under which cosmologies driven by time-varying cosmological terms can be described by a scalar field coupled to a perfect fluid are discussed. An algorithm to reconstruct potentials dynamically and thermodynamically analogous to given phenomenological λ models is presented. As a working example, the deflationary cosmology which evolves from a pure de Sitter vacuum state to a slightly modified Friedmann-Robertson-Walker cosmology is considered. It is found that this is an example of nonsingular warm inflation with an asymptotic exponential potential. Differences with respect to other scalar field descriptions of decaying vacuum cosmologies are addressed and possible extensions are indicated.
Issue Date: 
15-Apr-2002
Citation: 
Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 65, n. 8 A, p. 835131-835137, 2002.
Time Duration: 
835131-835137
Publisher: 
American Physical Soc
Keywords: 
  • Algorithm
  • Calculation
  • Cosmos
  • Energy
  • Molecular dynamics
  • Thermodynamics
  • Time
  • Vacuum
Source: 
http://dx.doi.org/10.1103/PhysRevD.65.083513
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/132335
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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