Inflectionpoint Inflation and Dark Matter Redux
Abstract
We investigate for viable models of inflation that can successfully produce dark matter (DM) from inflaton decay process, satisfying all the constraints from Cosmic Microwave Background (CMB) and from some other observations. In particular, we analyze nearinflectionpoint small field inflationary scenario with nonthermal production of fermionic DM from the decaying inflaton field during the reheating era. To this end, we propose two different models of inflation with polynomial potential. The potential of Model I contains terms proportional to linear, quadratic, and quartic in inflaton; whereas in Model II, the potential contains only even power of inflaton and the highest term is sextic in inflaton. For both the models, we find out possible constraints on the model parameters which lead to proper inflationary parameters from CMB data with a very small tensortoscalar ratio, as expected from a smallfield model. With the allowed parameter space from CMB, we then search for satisfactory relic abundance for DM, that can be produced from inflaton via reheating, to match with the presentday cold dark matter (CDM) relic density for the parameter spaces of the DM $\chi$ mass and Yukawa couplings in the range $10^{9} \gtrsim y_{\chi} \gtrsim 10^{15}$ and $10^3 \text{GeV} \lesssim m_{\chi} \lesssim 10^9 \text{GeV}$. The DM relic is associated with the inflectionpoints in each model via maximum temperature reached in the early universe during its production. Finally, we find out allowed parameter space coming out of combined constraints from stability analysis for both SM Higgs and DM decays from inflaton as well as from BBN and Lyman$\alpha$ bounds.
 Publication:

arXiv eprints
 Pub Date:
 June 2022
 arXiv:
 arXiv:2206.10648
 Bibcode:
 2022arXiv220610648G
 Keywords:

 High Energy Physics  Phenomenology;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 39 pages, 18 figures