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pro vyhledávání: '"Comeau, Vincent"'
Autor:
Comeau, Vincent
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 on the gauge used for their calculation. In this paper, we propose a
Externí odkaz:
http://arxiv.org/abs/2309.14624
Autor:
Comeau, Vincent
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 fluids. The calculation is carried out up to the second order in the pertu
Externí odkaz:
http://arxiv.org/abs/2304.14187
Autor:
Comeau, Vincent, Brandenberger, Robert
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 the infrared limit, the fluctuations lead to a decrease in the average
Externí odkaz:
http://arxiv.org/abs/2302.05873
We study the non-linear stability of fixed-point solutions to the $\alpha'$-exact equations from O$(d,d)$ invariant cosmology, with and without matter perturbations. Previous non-linear analysis in the literature is revisited, and its compatibility w
Externí odkaz:
http://arxiv.org/abs/2212.11392
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 of the effective cosmological constant is only measurable if an addit
Externí odkaz:
http://arxiv.org/abs/2201.08824
Publikováno v:
SIGMA 16 (2020), 124, 15 pages
We present further mathematical results on a function appearing in the conformal blocks of four-point correlation functions with arbitrary quasi-primary operators. The $H$-function was introduced in a previous article and it has several interesting p
Externí odkaz:
http://arxiv.org/abs/1902.08598
Autor:
Comeau, Vincent1 (AUTHOR), Brandenberger, Robert1,2 (AUTHOR) rhb@physics.mcgill.ca
Publikováno v:
European Physical Journal C -- Particles & Fields. Mar2024, Vol. 84 Issue 3, p1-7. 7p.
Publikováno v:
Galaxies (2075-4434); Oct2024, Vol. 12 Issue 5, p56, 11p
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