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Prescription for Cosmic Information Extraction from Multiple Sky Maps
Steven Gratton
This paper presents a prescription for distilling the information contained in the cosmic microwave background radiation from multiple sky maps that also contain both instrument no…
Prospects for Constraining Neutrino Mass Using Planck and Lyman-Alpha Forest Data
Steven Gratton, Antony Lewis, George Efstathiou
In this paper we investigate how well Planck and Lyman-Alpha forest data will be able to constrain the sum of the neutrino masses, and thus, in conjunction with flavour oscillation…
Conditions for Generating Scale-Invariant Density Perturbations
Steven Gratton, Justin Khoury, Paul J. Steinhardt +1
We analyze the general conditions on the equation of state required for quantum fluctuations of a scalar field to produce a scale-invariant spectrum of density perturbations, i…
Steady-State Eternal Inflation
Anthony Aguirre, Steven Gratton
Since the advent of inflation, several theorems have been proven suggesting that although inflation can (and generically does) continue eternally into the future, it cannot be exte…
Closed Universes from Cosmological Instantons
Steven Gratton, Antony Lewis, Neil Turok
Current observational data is consistent with the universe being slightly closed. We investigate families of singular and non-singular closed instantons that could describe the beg…
An Observational Test of Quantum Cosmology
Steven Gratton, Thomas Hertog, Neil Turok
We compute the tensor CMB anisotropy power spectrum for singular and non-singular instantons describing the beginning of an open universe according to the Euclidean no boundary pro…