4.4 Article

A dilaton-axion model for string cosmology

期刊

JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 6, 页码 -

出版社

SPRINGER
DOI: 10.1007/JHEP06(2022)001

关键词

String and Brane Phenomenology; Supergravity Models; Cosmology of Theories BSM; Models of Quantum Gravity

资金

  1. MINECO [PID2019-105614GBC21]
  2. STFC [ST/T000694/1]

向作者/读者索取更多资源

This study generalizes the scale-invariant theory of an axion and a dilaton coupled to gravity to a 'universal' one-axion model with two dilatons that reproduces itself under consistent dimensional-reduction/truncation. It shows that flat FLRW cosmologies correspond to trajectories of a three-dimensional autonomous dynamical system and analyzes them with a focus on accelerated cosmic expansion, deriving precise swampland bounds that exclude eternal acceleration.
The generic scale-invariant theory of an axion and a dilaton coupled to gravity in d-dimensions is generalized to a 'universal' one-axion model with two dilatons that reproduces itself under consistent dimensional-reduction/truncation. Flat FLRW cosmologies are shown to correspond to trajectories of a three-dimensional autonomous dynamical system, which we analyse with a focus on accelerated cosmic expansion, deriving the precise swampland bounds that exclude eternal acceleration. We also show that for two sets of values of its three independent parameters, the model is a consistent truncation of maximal 'massive' supergravity theories arising from string/M-theory; for these maximal-supergravity parameter values the FLRW cosmologies include some with a transient de Sitter-like phase, but not the recurring de Sitter-like phase or eternal cosmic acceleration that is possible for other parameter values.

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