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gr-qc2023
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…
gr-qc2023
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…
gr-qc2023
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…