U A Yajnik
Articles written in Pramana – Journal of Physics
Volume 62 Issue 3 March 2004 pp 771-773
The presence of domain walls separating regions of unbroken
Volume 63 Issue 6 December 2004 pp 1317-1330
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.
Volume 93 | Issue 6
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