Mohanty, Subhendra Sahni, Varun Chakraborty, S. Goyal, Ashok Dutta, Sukanta Choudhury, Debajyoti Mahajan, Shobhit Mukherjee, Amitabha Widyan, Hatem Yajnik, Urjit
...
Published in
Pramana

The astroparticle physics working group witnessed intense discussion and activity covering a broad range of topics ranging from supergravity and baryogenesis to compact stars and the large scale structure of the Universe. A summary of some of the subject areas in which collaborations were initiated during WHEPP-5 is presented below.

Liu, Yong Sarkar, Utpal

The CP violation required in leptogenesis may have different origin, but in an effective theory they all are related to the rephasing invariant CP violating measure in the mixing matrix of the leptonic sector. We point out that the maximum amount of CP violation in some models can be estimated with our present knowledge of the neutrino mixing angle...

Elfgren, Erik

This Master of Science thesis treats the hypercharge axion, which is a hypothetical pseudo-scalar particle with electroweak interactions. First, the theoretical context and the motivations for this study are discussed. In short, the hypercharge axion is introduced to explain the dominance of matter over antimatter in the universe and the existence ...

Guth, Alan

The Early Universe provides an introduction to modern cosmology. The first half deals with the development of the big-bang theory from 1915 to 1980, and latter half with recent impact of particle theory.

Orloff, Jean

présenté par J. Orloff

Ealet, Anne

la physique des particules s'appuie sur une théorie dont les prédictions sont mesurables dans les grands collisionneurs. Les résultats obtenus confortent cette theorie electrofaible de basse énergie mais aucune déviation aujourd'hui n'annonce de la nouvelle physique. Ce qui devient étonnant, c'est qu'aucun des résultats ne confortent les observatio...

Akhmedov, Evgeny Blennow, Mattias Hällgren, Tomas Konstandin, Thomas Ohlsson, Tommy

We analyze the left-right symmetric type I+II seesaw mechanism, where an eight-fold degeneracy among the mass matrices of heavy right-handed neutrinos M-R is known to exist. Using the stability property of the solutions and their ability to lead to successful baryogenesis via leptogenesis as additional criteria, we discriminate among these eight so...

Frigerio, Michele

We discuss a source of light neutrino masses and leptogenesis in SO(10) unification theories, that was not previously recognized. It is present when the light lepton doublets belong (at least partially) to dimension‐10 matter multiplets. At odds with previous leptogenesis scenarios, the CP asymmetry depends only on the low energy flavour parameters...

Fidler, Christian

Polarisation and Nongaussianity are expected to play a central role in future studies of the cosmic microwave background radiation. Polarisation can be split into a divergence-like E-mode and a curl-like B-mode, of which the later can only be induced by primordial gravitational waves (tensor uctuations of the metric) at leading order. Nongaussiaity...

Wainwright, Carroll Livingston

I explore the theory and computation of early-Universe finite-temperature phase transitions involving scalar fields. I focus primarily on the electroweak phase transition, but some of the methods I develop are applicable to any scalar-field cosmological phase transition (such as the computation of the lifetime of zero-temperature metastable vacua)....