20-24 May 2013
Bonn
Europe/Berlin timezone
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Parallel Session on Cosmology

Place

Location: Bonn
Address: Physikalisches Institut Nussallee 12 53115 Bonn
Date: 21 May 14:00 - 6:00 PM

Conveners

    • Mrs. Covi, Laura
    • Mrs. Covi, Laura

Timetable | Contribution List

Displaying 9 contributions out of 9
I present a model of baryogenesis through leptogenesis, inspired from arXiv:0804.0801, in which a lepton asymmetry is generated by the CP-violating decay of an electroweak scalar triplet. This triplet also gives rise to neutrino Majorana masses through the type II seesaw mechanism. Therefore, there is a very direct link between the CP asymmetry and neutrino parameters, which are already known or c ... More
Presented by Benoit SCHMAUCH on 21/5/2013 at 14:20
We evaluate the modifications to the CMB anisotropy spectrum that result from a semiclassical expansion of the Wheeler–DeWitt equation for a real scalar field coupled to gravity in a spatially flat FLRW universe. Recently, such an investigation has led to the prediction that the power at large scales is suppressed. We make here a more general analysis and show that there is an ambiguity in the c ... More
Presented by Giampiero ESPOSITO on 21/5/2013 at 12:00
I will report on the first numerical 3+1D simulation of a thermal first-order phase transition. The simulation includes a scalar field plus a relativistic fluid. We follow the evolution and collisions of the bubbles related to the phase transition. We compute the generated gravitational wave spectrum, and find that their prime source are sound produced by the colliding bubbles.
Presented by Stephan HUBER on 21/5/2013 at 13:00
The Higgs-Dilaton cosmological model describes simultaneously an inflationary period in the early Universe and a dark energy dominated stage responsible for the present day acceleration. The common origin of both processes gives rise to a non-trivial relation between the spectral tilt of scalar perturbations and the dark energy equation of state. We study the self-consistency of this model from an ... More
Presented by Javier RUBIO on 21/5/2013 at 15:00
Recent LHC results suggest the electroweak vacuum metastability. Although its lifetime is longer than the cosmic age in almost all the parameter space, quantum tunneling to the unwanted true vacuum in the quasi-de Sitter background may occur during inflation. This, in turn, constrains severely high-scale inflation models. In this talk, we discuss how to avoid such tunneling during high-scale infla ... More
Presented by Kohei KAMADA on 21/5/2013 at 15:20
I give a brief overview of a recently proposed mechanism dubbed WIMPy baryogenesis. A stable Weakly Interacting Massive Particle (WIMP) is the Dark Matter (DM) candidate. Via CP-violating annihilations of the WIMP into a quark and an exotic heavy antiquark, one gets not only the right DM thermal relic abundance but also generates the observed baryon asymmetry. I discuss the key ingredients of the ... More
Presented by Lorenzo UBALDI on 21/5/2013 at 15:40
We explain how non-equilibrium methods give rise to NLO corrections to the theory of unflavoured Leptogenesis in the strong washout regime. New LO predictions are made available in the weak washout case (including Leptogenesis from mixing light sterile neutrinos) and for the transition between the flavoured and unflavoured regimes. As a new source of CP-violation, we identify the mixing of active ... More
Presented by Björn GARBRECHT on 21/5/2013 at 12:30
We do a random scan over the parameter space of the two-Higgs-doublet model searching for points with a strong phase transition. The results show that the model is a robust candidate for explaining baryogenesis, especially in the light of the recent results by ATLAS and CMS regarding the properties of the recently discovered scalar.
Presented by Glauber CARVALHO DORSCH on 21/5/2013 at 14:00
We discuss recent progress on supersymmetric tribrid inflation, a variant of hybrid inflation which is particularly suited for connecting inflation with particle physics. Inflation ends with a phase transition near the GUT scale, and the inflaton can be a D-flat combination of charged fields in the matter sector of the particle theory. This relates the inflaton couplings -- which can be constraine ... More
Presented by David NOLDE on 21/5/2013 at 14:40
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