7 citations · 12 across the 6 of their papers we have counts for
7 papers
Evolving Dark Energy from the Back-Reaction of Cosmological Perturbations
Vincent Comeau
We argue that the back-reaction of inhomogeneities, when combined with a pure cosmological constant, produces an effective dark energy whose equation of state can evolve with time.…
Gauge-Invariant Scalar-Induced Gravitational Waves from Physical Observables
Vincent Comeau
This paper discusses the gauge issue touching the gravitational waves induced at the second order by the scalar modes of cosmological perturbations. These waves are known to depend…
Perturbative Correction to the Average Expansion Rate of Spacetimes with Perfect Fluids
Vincent Comeau
This paper discusses the leading-order correction induced by cosmological perturbations on the average expansion rate of an expanding spacetime, containing one or many perfect flui…
Back-Reaction of Long-Wavelength Cosmological Fluctuations as Measured by a Clock Field
Vincent Comeau, Robert Brandenberger
We consider the back-reaction of cosmological fluctuations on the local expansion rate averaged over a space-like hypersurface of constant value of a clock field. We show that in t…
Non-linear stability of -corrected Friedmann equations
Heliudson Bernardo, Jan Chojnacki, Vincent Comeau
We study the non-linear stability of fixed-point solutions to the -exact equations from O invariant cosmology, with and without matter perturbations. Previous non-linear…
Clock Fields and Logarithmic Decay of Dark Energy
Robert Brandenberger, Vincent Comeau, Leonardo Fossati +1
We investigate the physical measurability of the infrared instability of a de Sitter phase in the formalism recently proposed by Kitamoto et al.. We find that the logarithmic decay…
Further Results on a Function Relevant for Conformal Blocks
Vincent Comeau, Jean-François Fortin, Witold Skiba
We present further mathematical results on a function appearing in the conformal blocks of four-point correlation functions with arbitrary quasi-primary operators. The -function…