Cosmological constraints in the presence of ionizing and resonance radiation at recombination

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dc.creatorBean, Rachel
dc.creatorMelchiorri, Alessandro
dc.creatorSilk, Joe
dc.date2007-01-09
dc.date.accessioned2026-07-07T10:21:26Z
dc.date.available2026-07-07T10:21:26Z
dc.descriptionWith the recent measurement of full sky cosmic microwave background polarization from WMAP, key cosmological degeneracies have been broken, allowing tighter constraints to be placed on cosmological parameters inferred assuming a standard recombination scenario. Here we consider the effect on cosmological constraints if additional ionizing and resonance radiation sources are present at recombination. We find that the new CMB data significantly improve the constraints on the additional radiation sources, with $\log_{10}[ε_α] < -0.5$ and $\log_{10}[ε_{i}] <-2.4$ at 95% c.l. for resonance and ionizing sources respectively. Including the generalized recombination scenario, however, we find that the constraints on the scalar spectral index $n_s$ are weakened to $n_s=0.98\pm0.03$, with the $n_s=1$ case now well inside the 95% c.l.. The relaxation of constraints on tensor modes, scale invariance, dark energy and neutrino masses are also discussed.
dc.description6 Pages, 7 Figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0701224
dc.identifierhttp://arxiv.org/abs/astro-ph/0701224
dc.identifierPhys.Rev.D75:063505,2007
dc.identifierdoi:10.1103/PhysRevD.75.063505
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/175171
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.titleCosmological constraints in the presence of ionizing and resonance radiation at recombination
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