Conveners
Cosmology III
- Nobuchika Okada
Mr
Sungwoo Hong
(University of Maryland at College Park)
5/5/15, 2:00 PM
parallel talk
We consider theories where dark matter is composed of a thermal relic of weak scale mass, whose
couplings to the Standard Model (SM) are however too small to give rise to the observed abundance.
Instead, the abundance is set by annihilation to hidden sector states that carry no charges under
the SM gauge interactions. In such a scenario the constraints from direct and indirect...
Jeff Kost
(University of Arizona)
5/5/15, 2:15 PM
parallel talk
Light scalar fields such as string moduli, axions, and other possible dark-matter candidates play an important role in early-universe cosmology. However, a number of disparate considerations can significantly impact the late-time cosmological abundances of these fields. For example, in cases where the potentials (and therefore the masses) for such fields are generated dynamically --- such as...
Akshay Ghalsasi
(University of Washington)
5/5/15, 2:30 PM
parallel talk
We propose a model with a heavy O(TeV) coloured scalar which couples to the quarks via a singlet majorana fermion. After the chiral phase transition the heavy scalar binds with the SM quarks to form mesinos and anti mesinos. The mesino and antimesino undergo oscillations mediated via the singlet and these oscillations are the source of CP violation. The colored scalar then decays in a baryon...
Louis Lello
(University of Pittsburgh)
5/5/15, 2:45 PM
parallel talk
We study the production of sterile neutrinos in the early universe from $\pi \rightarrow l \nu_s$ shortly after the QCD phase transition in the absence of a lepton asymmetry while including finite temperature corrections to the $\pi$ mass and decay constant $f_{\pi}$. Sterile neutrinos with masses $ \lesssim 1 MeV$ produced via this mechanism freeze-out at $T_f \simeq 10 MeV$ with a...
Harikrishnan Ramani
(Yang Institute Of Theoretical Physics)
5/5/15, 3:00 PM
parallel talk
The standard model cannot provide a first order Electro-weak phase transition needed to explain Baryogenesis. Extensions to the standard model need to take into account break down of perturbation theory at high temperatures. An all-order resummation is performed via "Ring corrections" to take into account "Daisy diagrams" but this is usually carried out in the high temperature small coupling...
Ms
Kaori Fuyuto
(Nagoya University)
5/5/15, 3:15 PM
parallel talk
We revisit an electroweak phase transition in the scale-invariant two Higgs doublet model in light of 125 GeV Higgs boson. The analysis is conducted by using the finite temperature one-loop effective potential with thermal resummation. We also discuss its impact on the
Higgs boson couplings. We find that the so-called sphaleron decoupling condition is more severe than the conventional one by...
Lauren Pearce
(University of Minnesota)
5/5/15, 3:30 PM
parallel talk
The recent observation of a relatively light Higgs boson at the LHC suggests that the Standard Model potential rises relatively slowly at large vacuum expectation values, and may even develop a second minimum. In such cases, the Higgs boson may develop a large vacuum expectation value during inflation; subsequently, it will relax to its equilibrium value. During this epoch, the...
