SUSY07

Session

Cosmology 4

Cos4

27 Jul 2007, 16:30

Physics Building (Karlsruhe University)

175. Constraints on the very early universe from WIMP dark matter

Dr Mitsuru Kakizaki (Physics Institute, Bonn University)

27/07/2007, 16:30

Cosmology and Astrophysics

Parallel Talk

We investigate the relic density n_\chi of non-relativistic long-lived or stable particles \chi in non-standard cosmological scenarios. We calculate the relic abundance starting from arbitrary initial temperatures of the radiation- dominated epoch, and derive the lower bound on the initial temperature T_0 \geq m_\chi/23, assuming that thermally produced \chi particles account for the...

186. Phenomenology of sub-GUT Supersymmetry Breaking

Pearl Sandick (University of Minnesota)

27/07/2007, 16:50

Cosmology and Astrophysics

Parallel Talk

We study models in which supersymmetry breaking appears at an intermediate scale, M_{in}, below the GUT scale. We assume that the soft supersymmetry-breaking parameters of the MSSM are universal at M_{in}, and study the morphology of the constraints from cosmology and collider experiments on the allowed regions of parameter space as M_{in} is reduced from the GUT scale. We present...

195. The Lightest Higgs Boson and Relic Neutralino in the MSSM with CP Violation

Dr Stefano Scopel (Korea Institute of Advanced Study, Seoul)

27/07/2007, 17:10

Cosmology and Astrophysics

Parallel Talk

We discuss the lower bound to the lightest Higgs boson H_1 in the minimal supersymmetric extension of the standard model with explicit CP violation, and the phenomenology of the lightest relic neutralino in the same scenario. We find that the combination of present experimental constraints favours a region of the parameter space where the mass of H_1 is in the range 7 GeV < M_{H_1} < 10...

249. SUSY-GUTs, SUSY-Seesaw and the Neutralino Dark Matter

Lorenzo Calibbi (Universitat de Valencia)

27/07/2007, 17:30

Cosmology and Astrophysics

Parallel Talk

We will consider a SUSY-$SU(5)$ with one right-handed neutrino with a large top like Yukawa coupling. Assuming universal soft masses at high scale we compute the low-energy spectrum and subsequently the neutralino LSP relic density taking also into consideration $SU(5)$ as well as the see-saw running effects above the gauge coupling unification scale. We found that there exists no...

278. Effect of radiative corrections at order alpha_s to neutralino annihilation processes on the cold dark matter relic density

Mr Björn Herrmann (LPSC Grenoble)

27/07/2007, 17:50

Cosmology and Astrophysics

Parallel Talk

Supersymmetry (SUSY) is the most economical and best studied possible extension of the Standard Model of particle physics. In particular, the lightest of the four neutralinos is a good candidate for the cold dark matter, which accounts for about 25% of our universe and whose nature remains at present unknown. The possibility to compute the neutralino relic density within a given model and...

350. Constraining the mSUGRA parameter space through entropy and abundance criteria

Prof. Myriam Mondragon (Instituto de Fisica, UNAM, Mexico)

27/07/2007, 18:10

Cosmology and Astrophysics

Parallel Talk

We derive an expression for the entropy of a present dark matter halo described by the Navarro-Frenk-White model and a core. The comparison of this entropy with the one of the halo at the freeze-out era allows us to constrain the parameter space in mSUGRA models, when used with the WMAP observations. Moreover, by joning these results with the ones obtained from the usual abundance...