An indirect limit on the amplitude of primordial Gravitational Wave Background from CMB-Galaxy Cross Correlation

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dc.creatorCooray, A.
dc.creatorCorasaniti, P. S.
dc.creatorGiannantonio, T.
dc.creatorMelchiorri, A.
dc.date2005-04-13
dc.date2005-07-18
dc.date.accessioned2026-07-07T10:43:14Z
dc.date.available2026-07-07T10:43:14Z
dc.descriptionWhile large scale cosmic microwave background (CMB) anisotropies involve a combination of the scalar and tensor fluctuations, the scalar amplitude can be independently determined through the CMB-galaxy cross-correlation. Using recently measured cross-correlation amplitudes, arising from the cross-correlation between galaxies and the Integrated Sachs Wolfe effect in CMB anisotropies, we obtain a constraint r < 0.5 at 68% confidence level on the tensor-to-scalar fluctuation amplitude ratio. The data also allow us to exclude gravity waves at a level of a few percent, relative to the density field, in a low - Lambda dominated universe(Omega_Lambda~0.5). In future, joining cross-correlation ISW measurements, which captures cosmological parameter information, with independent determinations of the matter density and CMB anisotropy power spectrum, may constrain the tensor-to-scalar ratio to a level above 0.05. This value is the ultimate limit on tensor-to-scalar ratio from temperature anisotropy maps when all other cosmological parameters except for the tensor amplitude are known and the combination with CMB-galaxy correlation allows this limit to be reached easily by accounting for degeneracies in certain cosmological parameters.
dc.description5 Pages, 1 Figure, revised discussion on cosmic variance limits on the tensor-to-scalar ratio from CMB, matches PRD accepted version
dc.identifierhttps://arxiv.org/abs/astro-ph/0504290
dc.identifierhttp://arxiv.org/abs/astro-ph/0504290
dc.identifierPhys.Rev.D72:023514,2005
dc.identifierdoi:10.1103/PhysRevD.72.023514
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/182167
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.titleAn indirect limit on the amplitude of primordial Gravitational Wave Background from CMB-Galaxy Cross Correlation
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