83 citations · 313 across the 13 of their papers we have counts for
6 papers · 1 filter
The Degeneracy Problem in Non-Canonical Inflation
Damien A. Easson, Brian A. Powell
While attempting to connect inflationary theories to observational physics, a potential difficulty is the degeneracy problem: a single set of observables maps to a range of differe…
Scalar runnings and a test of slow roll from CMB distortions
Brian A. Powell
A future measurement of cosmic microwave μ-distortions by an experiment with the specifications of PIXIE will provide an equivalent 3-sigma detection of the running of running of t…
Inflaton or Curvaton? Constraints on Bimodal Primordial Spectra from Mixed Perturbations
William H. Kinney, Azadeh Moradinezhad Dizgah, Antonio Riotto
We consider Cosmic Microwave Background constraints on inflation models for which the primordial power spectrum is a mixture of perturbations generated by inflaton fluctuations and…
Optimizing future experimental probes of inflation
Damien A. Easson, Brian A. Powell
The discovery of many novel realizations of the inflationary universe paradigm has led to a degeneracy problem: many different inflationary Lagrangians generate the same perturbati…
Observational Signatures of Gravitational Couplings in DBI Inflation
Damien A. Easson, Shinji Mukohyama, Brian A. Powell
In scalar-tensor theories the scalar fields generically couple nontrivially to gravity. We study the observable properties of inflationary models with non-minimally coupled inflato…
Cosmological Constraints on Rapid Roll Inflation
Takeshi Kobayashi, Shinji Mukohyama, Brian A. Powell
We obtain cosmological constraints on models of inflation which exhibit rapid roll solutions. Rapid roll attractors exist for potentials with large mass terms and are thus of inter…