146 citations · 725 across the 37 of their papers we have counts for
38 papers
The quantum Fokker-Planck equation of stochastic inflation
Hael Collins, Richard Holman, Tereza Vardanyan
We derive the stochastic description of a massless, interacting scalar field in de Sitter space directly from the quantum theory. This is done by showing that the density matrix fo…
Entangled Scalar and Tensor Fluctuations during Inflation
Hael Collins, Tereza Vardanyan
We show how the choice of an inflationary state that entangles scalar and tensor fluctuations affects the angular two-point correlation functions of the , , and modes of…
Renormalizing an initial state
Hael Collins, R. Holman, Tereza Vardanyan
The intricate machinery of perturbative quantum field theory has largely been devoted to the 'dynamical' side of the theory: simple states are evolved in complicated ways. This art…
A Cosmological Slavnov-Taylor Identity
Hael Collins, R. Holman, Tereza Vardanyan
We develop a method for treating the consistency relations of inflation that includes the full time-evolution of the state. This approach relies only on the symmetries of the infla…
Do Mixed States save Effective Field Theory from BICEP?
Hael Collins, R. Holman, Tereza Vardanyan
The BICEP2 collaboration has for the first time observed the B-mode polarization associated with inflationary gravitational waves. Their result has some discomfiting implications f…
Initial state propagators
Hael Collins
It is possible to define a general initial state for a quantum field by introducing a contribution to the action defined at an initial-time boundary. The propagator for this theory…