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5 papers · 2 filters
Bound on largest from sub-Planckian excursions of inflaton
Arindam Chatterjee, Anupam Mazumdar
In this paper we will discuss the range of large tensor to scalar ratio, , obtainable from a sub-Planckian excursion of a {\it single}, {\it slow roll} driven inflaton field. In…
Effect of transitions in the Planck mass during inflation on primordial power spectra
Amjad Ashoorioon, Carsten van de Bruck, Peter Millington +1
We study the effect of sudden transitions in the effective Planck mass during inflation on primordial power spectra. Specifically, we consider models in which this variation result…
Generating $\fnl$ at $\ell\lsim 60$
David H. Lyth
The CMB anisotropy at $\ell\lsim 60$ seems to have some special features which include (i) a dipole modulation and (ii) a decrease in power. It is known that both of these effects…
Negative Running of the Spectral Index, Hemispherical Asymmetry and the Consistency of Planck with Large
John McDonald
Planck favours a negative running of the spectral index, with the likelihood being dominated by low multipoles and no preference for running at higher . A negati…
Hemispherical Power Asymmetry from a Space-Dependent Component of the Adiabatic Power Spectrum
John McDonald
The hemispherical power asymmetry observed by Planck and WMAP can be interpreted as due to a spatially-varying and scale-dependent component of the adiabatic power spectrum. We der…