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10 papers · 2 filters
Precise calculation of neutralino relic density in the minimal supergravity model
Takeshi Nihei
We study precise calculation of neutralino relic density in the minimal supergravity model. We compare the exact formula for the thermal average of the neutralino annihilation cros…
Is nonperturbative inflatino production during preheating a real threat to cosmology?
Rouzbeh Allahverdi, Mar Bastero-Gil, Anupam Mazumdar
We discuss toy models where supersymmetry is broken due to non-vanishing time-varying vacuum expectation value of the inflaton field during preheating. We discuss the production of…
Cosmological constraints on a Peccei-Quinn flatino as the lightest supersymmetric particle
Eung Jin Chun, Hang Bae Kim, David H. Lyth
In an interesting class of models, non-renormalizable terms of the superpotential are responsible for the spontanteous breaking of Peccei-Quinn (PQ) symmetry as well as the generat…
The abundance of relativistic axions in a flaton model of Peccei-Quinn symmetry
Eung Jin Chun, Denis Comelli, David H. Lyth
Flaton models of Peccei-Quinn symmetry have good particle physics motivation, and are likely to cause thermal inflation leading to a well-defined cosmology. They can solve the …
Interesting consequences of brane cosmology
Anupam Mazumdar
We discuss cosmology in four dimensions within a context of brane-world scenario.Such models can predict chaotic inflation with very low reheat temperature depending on the brane t…
Lepton Flavor Violation and Bilinear R-parity Violation
Kiwoon Choi, Eung Jin Chun, Kyuwan Hwang
We examine some flavor changing processes such as rare leptonic decays of the long-lived neutral kaon, muon-electron conversion in nuclei and radiative muon decay which are induced…