Natural inflation at the GUT scale

Natural inflation driven by Pseudo-Nambu-Goldstone bosons have a problem that the nearly scale invariant spectrum of density perturbations is attained only when the symmetry breaking scale is of the order of Planck scale. We show here that if one couples the PNGB to a thermal bath as in warm inflation models, the amplitude and spectral index which agrees with the WMAP data is obtained with the symmetry breaking in the GUT scale. We give a GUT model of PNGB arising out of spontaneously broken lepton number at the GUT scale which gives rise to heavy Majorana masses for the right handed neutrinos which is needed in see-saw models. This model also generates a lepton asymmetry because of the derivative coupling of the PNGB to the lepton current. A characteristic feature of this model is the prediction of large non-gaussianity which may be observed in the forthcoming PLANCK experiment.Comment: Final version, published in Physical Review

A Ward-by-Ward Approach to Eliminating Open Defecation: Experience from Visakhapatnam, India

The Government of India launched the Swachh Bharat Mission (SBM) in 2014 with the ambitious aim to ensure hygiene, waste management and sanitation across the nation by the 150th anniversary of Gandhi's birth in October 2019. This document aims to build on existing knowledge by detailing how the challenge of achieving universal sanitation and Open Defecation Free (ODF) status has been approached by Visakhapatnam in Andhra Pradesh, presenting nine stepping stones which together constitute a pathway towards citywide ODF status