Easson, Damien A;
Manton, Tucker;
Svesko, Andrew;
(2021)
Cosmic acceleration from string induced Galileons.
Journal of Cosmology and Astroparticle Physics
, 2021
(10)
, Article 076. 10.1088/1475-7516/2021/10/076.
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Abstract
It has been shown a specific Horndeski theory of gravity arises from a consistent Kaluza-Klein reduction of the gravi-dilaton sector of the low-energy effective heterotic string action with a first α' correction. Here we provide a first investigation of the cosmological solutions to the lower dimensional theory by constructing exact solutions to the field equations in various frames. At tree level, in string frame, we find the duality symmetry of the parent theory is unaltered by dimensional reduction, leading to standard bouncing and pre-Big Bang scenario solutions. For α'≠0, we uncover exact models exhibiting cosmic acceleration, where we find interesting physics concerning the number of noncompact dimensions. Certain stability requirements demand the inclusion of a dilaton potential.
| Type: | Article |
|---|---|
| Title: | Cosmic acceleration from string induced Galileons |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/1475-7516/2021/10/076 |
| Publisher version: | https://doi.org/10.1088/1475-7516/2021/10/076 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10143160 |
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