Volume 129, Number 4, February 2020
|Number of page(s)||7|
|Published online||23 March 2020|
Aspects of axion F(R) gravity
1 ICREA - Passeig Luis Companys, 23, 08010 Barcelona, Spain
2 Institute of Space Sciences (IEEC- CSIC) - C. Can Magrans s/n, 08193 Barcelona, Spain
3 Department of Physics, Aristotle University of Thessaloniki - Thessaloniki 54124, Greece
4 Laboratory for Theoretical Cosmology, Tomsk State University of Control Systems and Radioelectronics (TUSUR) 634050 Tomsk, Russia
5 Tomsk State Pedagogical University - 634061 Tomsk, Russia
Received: 20 February 2020
Accepted: 6 March 2020
We provide a compact review on recent developments on axion F(R) gravity. The axion field is a string-theory–originated theoretical particle that is a perfect candidate for low-mass particle dark matter. In this review we present how a viable inflationary phenomenology and a viable late-time evolution can be described by an axion F(R) gravity theory, in which the F(R) gravity part can drive in a geometric way the inflationary and the late-time era, and the axion field behaves as dark matter, with its energy density behaving as a function of the scale factor as . We also briefly discuss the effect of a non-trivial axion Chern-Simons coupling on the inflationary phenomenology of the R2 model. Finally, we briefly discuss the effects of a non-minimal coupling of the axion field with the curvature on neutron stars, and also the propagation of gravity waves in Chern-Simons axion gravity.
PACS: 04.50.Kd – Modified theories of gravity / 95.36.+x – Dark energy / 98.80.-k – Cosmology
© EPLA, 2020
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.