Deflation of Vacuum Energy During Inflation Due to Bulk-Brane Interaction
arXiv:2006.11517 · doi:10.1088/1475-7516/2020/10/050
Abstract
We consider a brane world inflationary model in which inflation is driven by dynamics of a self-interacting scalar field living in the five-dimensional bulk. The scalar field is non-minimally coupled to matter fields on the brane and acts as an inflaton which induces a slow-roll inflation. We show that although the Friedmann equation is modified at early times due to effects of the extra dimension, the slow-roll condition is the same as that of the four-dimensional case. Due to the non-minimal coupling of matter with the bulk scalar, there is an energy transfer between the two components. We investigate the conditions under which the direction of this energy transfer can be from matter onto the bulk scalar. There are at least two advantages in this case: 1) It establishes a mechanism by which a large effective cosmological term on the brane is deflated during the inflation period. 2) The energy flow onto the bulk inflaton gives a more strongly damped evolution of the scalar field in the slow-roll region for a given potential. We then show that our results are supported by numerical estimations with quadratic and exponential potentials.
10 pages, 6 figures
References in corpus (9)
- Cosmological implications of baryon acoustic oscillation (BAO) measurements
- Whipped inflation
- Gravity localization and mass hierarchy in scalar-tensor branes
- Coupled quintessence and vacuum decay
- Brane Cosmology with a Non-Minimally Coupled Bulk-Scalar Field
- Localization and mass spectra of various matter fields on scalar-tensor brane
- Effect of the Chameleon Scalar Field on Brane Cosmological Evolution
- Deflation of the cosmological constant associated with inflation and dark energy
- Cosmological Constant in Chameleon Brans-Dicke Theory