### Conveners

#### Parallel Session 7: B - Collider experiment

- Frank Merritt ()

#### Parallel Session 7: A - Dark matter

- Richard Hill ()

#### Parallel Session 7: C - Inflation, cosmology

- Daniel Holz ()

#### Parallel Session 7: D - Leptogenesis

- Joachim Kopp (Fermilab)

Mr
Ken'ichi Saikawa
(Institute for Cosmic Ray Research, The University of Tokyo)

8/31/11, 2:00 PM

We reargue the axion cosmology which suffers from the domain wall problem. Domain walls are formed after the QCD phase transition, but it may disappear if we introduce a bias in the potential. We perform lattice simulations of domain wall networks and estimate the decay rate of domain walls. Using the result of the numerical study, we give the observational constraints for model parameters. We...

Clemens Lange

8/31/11, 2:00 PM

Mr
Brian Shuve
(Harvard University)

8/31/11, 2:00 PM

We present a new mechanism, "WIMPy Leptogenesis", which explains the near-coincidence of the present-day dark matter and baryon energy densities in a model of symmetric dark matter. In this scenario, WIMP annihilation is the source of the lepton asymmetry, which is generated by CP- and lepton-number-violating annihilations of the dark matter. The WIMP miracle is preserved, and the overall...

Dr
Kuver Sinha
(Texas A&M University)

8/31/11, 2:20 PM

We study inflection point inflation using Singularity Theory, which relates degenerate critical points of functions to their local behavior. This approach illuminates universal features of small-field models and gives analytic control over parametrized families of scalar potentials near inflationary solutions. The behavior of the scalar potential is tied to the number of physical input...

Dr
Frank Deppisch
(University College London)

8/31/11, 2:25 PM

We study the impact of minimal non-supersymmetric models of resonant leptogenesis on charged lepton flavour violation and the neutrino mixing angle theta(13). Possible low-scale flavour realisations of resonant tau-, mu- and e-leptogenesis provide very distinct and predictive frameworks to explain the observed baryon asymmetry in the Universe by sphaleron conversion of an individual tau-, mu-...

Dr
Yanou Cui
(Harvard University, University of Maryland-College Park)

8/31/11, 2:30 PM

We present a new mechanism for transferring a pre-existing lepton or baryon asymmetry to a dark matter asymmetry that relies on mass mixing which is dynamically induced in the early universe. Such mixing can succeed with only generic scales and operators and can give rise to distinctive relationships between the asymmetries in the two sectors. The mixing eliminates the need for the type of...

Prof.
Rouzbeh Allahverdi
(University of New Mexico)

8/31/11, 2:40 PM

We show that in supersymmetry one can obtain inflationary potentials that are sufficiently flat at sub-Planckian field values. Structure of the supersymmetric scalar potential combined with the existence of higher order terms in an effective field theory expansion allows to find potentials where any number of derivatives may vanish at a point below the effective field theory cut off. As an...

Dr
Osamu Seto
(Hokkai-Gakuen University)

8/31/11, 2:50 PM

We show that in a class of two Higgs doublet model, where one Higgs doublet
generates masses of quarks and charged leptons whereas the other Higgs doublet with a tiny vacuum expectation value generates neutrino Dirac masses.
Thermal leptogenesis suitably works at low energy scale.
Its supersymmetric generalization also will be discussed.

Dr
Roman Nevzorov
(University of Hawaii)

8/31/11, 3:00 PM

It is well known that in no--scale supergravity global symmetries
protect local supersymmetry (SUSY) and a zero value for the cosmological constant. The breakdown of these symmetries that ensures the vanishing of the vacuum energy density near the physical vacuum leads to the natural realization of the multiple point principle (MPP) assumption, i.e. results in the set of degenerate vacua with...

Chris Kelso
(University of Illinois at Chicago)

8/31/11, 3:10 PM

This talk will present on an independent analysis of the recent release of the first 15 months of CoGeNT's data. The analysis will focus on the properties of a dark matter particle that are consistent with the spectrum and modulation of the low energy excess of events in the detector. I will also examine the prospects of detecting such a dark matter particle at other experiments.

Dr
Pedro Schwaller
(ANL/UIC)

8/31/11, 3:15 PM

Inflation, dark energy, and early universe physics

Leptogenesis is a well motivated framework to generate the observed baryon asymmetry of the universe. In this talk, I will present novel results on the treatment of flavor and scattering effects in leptogenesis, which affect the final asymmetry. The results are obtained using methods from nonequilibrium quantum field theory, and and go beyond the usual treatment of these effects at the tree level.

Jason Nett
(Texas A&M University)

8/31/11, 3:15 PM

Toyokazu Fukuoka
(Tokai University)

8/31/11, 3:20 PM

We will propose a new modular invariant model with gaugino condensation inspired by heterotic string compactification. We investigate possible parameter ranges for which slow role inflation scenario can apply. As results of these survey, the calculated values of inflation parameters such as power spectrum, spectral index and its tilt coincide with the WMAP observations almost completely. The...

Prof.
Tim Tait
(UC Irvine)

8/31/11, 3:30 PM

I will discuss how effective theory descriptions of dark matter can capture many classes of WIMP models, and allow us to map constraints from colliders into the parameter spaces of other experiments, including direct detection and indirect detection.

Dr
Kunihito Uzawa
(Kindai University)

8/31/11, 3:40 PM

We present time-dependent solutions in the higher-dimensional gravity which are related to supergravity in the particular cases. Here, we consider p-branes with a cosmological constant and the intersections of two and more branes. The dynamical description of p-branes can be naturally obtained as the extension of static solutions. In the presence of a cosmological constant, we find...

Bhupal Dev
(University of Maryland)

8/31/11, 3:40 PM

We discuss leptogenesis within a TeV-scale SUSY Left Right model with inverse seesaw for neutrino masses. Contrary to the conventional TeV-scale type-I gauged seesaw, the constraints on the extra gauge bosons
in these models are rather weak and allow the W_R and Z' mass in the
LHC accessible range.