New Universal Local Feature in the Inflationary Perturbation Spectrum

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dc.creatorJoy, Minu
dc.creatorSahni, Varun
dc.creatorStarobinsky, Alexei A.
dc.date2007-11-12
dc.date2008-01-28
dc.date.accessioned2026-07-07T12:13:52Z
dc.date.available2026-07-07T12:13:52Z
dc.descriptionA model is developed in which the inflaton potential experiences a sudden small change in its second derivative (the effective mass of the inflaton). An exact treatment demonstrates that the resulting density perturbation has a quasi-flat power spectrum with a break in its slope (a step in n_s). The step in the spectral index is modulated by characteristic oscillations and results in large running of the spectral index localised over a few e-folds of scales. A field-theoretic model giving rise to such behaviour of the inflationary potential is based on a fast phase transition experienced by a second scalar field weakly coupled to the inflaton. Such a transition is similar to that which terminates inflation in the hybrid inflationary scenario. This scenario suggests that the observed running of the spectral index in the WMAP data may be caused by a fast second order phase transition which occurred during inflation.
dc.description4 figures, matches the published version
dc.identifierhttps://arxiv.org/abs/0711.1585
dc.identifierhttp://arxiv.org/abs/0711.1585
dc.identifierPhys.Rev.D77:023514,2008
dc.identifierdoi:10.1103/PhysRevD.77.023514
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/210999
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleNew Universal Local Feature in the Inflationary Perturbation Spectrum
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