Cosmological consequences of Yukawa-unified SUSY with mixed axion/axino cold and warm dark matter

Baer, Howard
Haider, Markus
Kraml, Sabine
Sekmen, Sezen
Summy, Heaya
Supersymmetric models with t - b - tau Yukawa unification at M-GUT qualitatively predict a sparticle mass spectrum including first and second generation scalars at the 3-15 TeV scale, third generation scalars at the (few) TeV scale and gluinos in the sub-TeV range. The neutralino relic density in these models typically turns out to lie far above the measured dark matter abundance, prompting the suggestion that instead dark matter is composed of an axion/axino mixture. We explore the axion and thermal and non-thermal axino dark matter abundance in Yukawa-unified SUSY models. We find in this scenario that (i) rather large values of Peccei-Quinn symmetry breaking scale f(a) similar to 10(12) GeV are favored and (ii) rather large values of GUT scale scalar masses similar to 10 - 15 TeV allow for the re-heat temperature T-R of the universe to be T-R greater than or similar to 10(6) GeV. This allows in turn a solution to the gravitino/Big Bang Nucleosynthesis problem while also allowing for baryogenesis via non-thermal leptogenesis. The large scalar masses for Yukawa-unified models are also favored by data on b -> s gamma and B-s -> mu(+)mu(-) decay. Testable consequences from this scenario include a possible axion detection at axion search experiments, but null results from direct and indirect WIMP search experiments.


Double-lepton polarization asymmetries and branching ratio of the B -> gamma l(+)l(-) transition in universal extra dimension
We study the radiative dileptonic B ->gamma l(+)l(-) transition in the presence of a universal extra dimension in the Applequist-Cheng-Dobrescu model. In particular, using the corresponding form factors calculated via light cone QCD sum rules, we analyze the branching ratio and double lepton polarization asymmetries related to this channel and compare the results with the predictions of the standard model. We show how the results deviate from predictions of the standard model at lower values of the compacti...
Rare B -> l(+)l(-)gamma decay and new physics effects
Alıyev, Tahmasıb; Özpineci, Altuğ; Savcı, Mustafa (2001-11-08)
Using the most general, model independent form of the effective Hamiltonian rare decays B --> l(+)l(-)gamma (l = mu, tau) are studied. The sensitivity of the photon energy distribution and branching ratio to the new Wilson coefficients is investigated.
Constraining four generation Standard Model with b->sy and b->sg
Alıyev, Tahmasıb; Pak, NK (1996-12-05)
Using the experimental result on b --> s gamma and theoretical result on b --> sg, a four generation Standard Model (SM) is analysed to constrain the rephasing-invariant combinations of the CKM matrix and masses of the fourth generation quarks.
Neutrino masses in the effective rank-5 subgroups of E-6. II. Supersymmetric case
Frank, M; Sher, M; Turan, İsmail (2005-06-01)
We present a complete analysis of the neutral fermion sector of supersymmetric E-6-inspired low-energy models containing an extra SU(2), concentrating on the alternative left-right and inert models. We show that the R-parity conserving scenario always exhibits a large Dirac mass for nu(L) with maximal mixing with an isosinglet neutrino, and that R-parity violating scenarios do not change the picture other than allowing further mixing with another isosinglet. In order to recover standard model phenomenology,...
Unified theory of linear instability of anisotropic surfaces and interfaces under capillary, electrostatic, and elastostatic forces: The regrowth of epitaxial amorphous silicon
Ogurtani, Tarik Omer (American Physical Society (APS), 2006-10-01)
The first-order unified linear instability analysis (LISA) of the governing equation for the evolution of surfaces and interfaces under capillary, electromigration (EM), and elastostatic forces is developed. A formal treatment of the thermomigration (Soret effect) driven by the nonuniform temperature distribution caused by exothermic phase transformation (growth) at the surface and interfacial layers is presented and its apparent influence on the capillary force in connection with the stability is also esta...
Citation Formats
H. Baer, M. Haider, S. Kraml, S. Sekmen, and H. Summy, “Cosmological consequences of Yukawa-unified SUSY with mixed axion/axino cold and warm dark matter,” JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, pp. 0–0, 2009, Accessed: 00, 2020. [Online]. Available: