• U A Yajnik

      Articles written in Pramana – Journal of Physics

    • Leptogenesis with left-right domain walls

      U A Yajnik J Cline M Rabikumar

      More Details Abstract Fulltext PDF

      The presence of domain walls separating regions of unbrokenSU(2)L andSU(2)R is shown to provide necessary conditions for leptogenesis which converts later to the observed baryon asymmetry. The strength of lepton number violation is related to the Majorana neutrino mass and hence related to current bounds on light neutrino masses. Thus the observed neutrino masses and the baryon asymmetry can be used to constrain the scale of left-right symmetry breaking.

    • Particle physics implications of Wilkinson microwave anisotropy project measurements

      U A Yajnik

      More Details Abstract Fulltext PDF

      We present an overview of the implications of the WMAP data for particle physics. The standard parameter set ∈, η and ξ characterising the inflaton potential can be related to the power-law indices characterising deviation of the CMB spectrum from the scale invariant form. Different classes of inflation potentials are in turn naturally associated with different unified schemes. At present WMAP does not exclude any but a few simple unified models. In particular, hybrid models favoured by supersymmetric unification continue to be viable. However future improvement in data leading to better determination of the ‘running’ of power-law indices should help to narrow the possibilities for unified models. The main conclusion is that WMAP is consistent with the paradigm of GUT scale (1016 GeV) inflation.

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