Upper limits on the Peccei-Quinn scale and on the reheating temperature in axino dark matter scenarios
Abstract
Considering axino cold dark matter scenarios with a long-lived charged slepton, we study constraints on the Peccei-Quinn scale f and on the reheating temperature T imposed by the dark matter density and by big bang nucleosynthesis (BBN). For an axino mass compatible with large-scale structure, m≳100 keV, temperatures above 10 GeV become viable for f>3×10 GeV. We calculate the slepton lifetime in hadronic axion models. With the dominant decay mode being two-loop suppressed, this lifetime can be sufficiently large to allow for primordial bound states leading to catalyzed BBN of lithium-6 and beryllium-9. This implies new upper limits on f and on T that depend on quantities which will be probed at the Large Hadron Collider.
- Publication:
-
Physics Letters B
- Pub Date:
- August 2009
- DOI:
- 10.1016/j.physletb.2009.07.047
- arXiv:
- arXiv:0904.3218
- Bibcode:
- 2009PhLB..679..270F
- Keywords:
-
- 98.80.Cq;
- 95.35.+d;
- 12.60.Jv;
- 95.30.Cq;
- Particle-theory and field-theory models of the early Universe;
- Dark matter;
- Supersymmetric models;
- Elementary particle processes;
- High Energy Physics - Phenomenology;
- Astrophysics - Cosmology and Extragalactic Astrophysics
- E-Print:
- 10 pages, 5 figures