Scalar-tensor analysis of an exponential Lagrangian for the gravitational field

O.M. Lecian, G. Montani

Research output: Contribution to conferencePaper

Abstract

Within the scheme of modified gravity, an exponential Lagrangian density will be considered, and the corresponding scalar-tensor description will be addressed for both positive and negative values of the cosmological constant. For negative values of the cosmological term, the potential of the scalar field exhibits a minimum, around which scalar-field equations can be linearized. The study of the deSitter regime shows that a comparison with the modified-gravity description is possible in an off-shell region, i.e., in a region where the classical equivalence between the two formulations is not fulfilled. Furthermore, despite the negative cosmological constant, an accelerating deSitter phase is predicted in the region where the series expansion of the exponential term does not hold. For positive values of the cosmological constant, the quantum regime is analyzed within the framework of Loop Quantum Cosmology. © 2008 American Institute of Physics.
Original languageEnglish
DOIs
Publication statusPublished - 2008
Externally publishedYes
Event4th Italian-Sino Workshop on Relativistic Astrophysics - , Italy
Duration: 1 Jan 2008 → …

Conference

Conference4th Italian-Sino Workshop on Relativistic Astrophysics
CountryItaly
Period1/1/08 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Lecian, O. M., & Montani, G. (2008). Scalar-tensor analysis of an exponential Lagrangian for the gravitational field. Paper presented at 4th Italian-Sino Workshop on Relativistic Astrophysics, Italy. https://doi.org/10.1063/1.2837006