Massless (pseudo-)scalar seeds of CMB anisotropy

A primordial stochastic background of very weakly coupled massless (pseudo-)scalars can seed CMB anisotropy, when large-scale fluctuations of their stress-tensor re-enter the horizon during the matter-dominated era. A general relation between multipole coefficients of the CMB anisotropy and the seed...

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Detalles Bibliográficos
Autores principales: Durrer, R., Gasperini, M., Sakellariadou, M., Veneziano, G.
Lenguaje:eng
Publicado: 1998
Materias:
Astrophysics and Astronomy
Acceso en línea:https://dx.doi.org/10.1016/S0370-2693(98)00833-8
http://cds.cern.ch/record/356090
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author Durrer, R.
Gasperini, M.
Sakellariadou, M.
Veneziano, G.
author_facet Durrer, R.
Gasperini, M.
Sakellariadou, M.
Veneziano, G.
author_sort Durrer, R.
collection CERN
description A primordial stochastic background of very weakly coupled massless (pseudo-)scalars can seed CMB anisotropy, when large-scale fluctuations of their stress-tensor re-enter the horizon during the matter-dominated era. A general relation between multipole coefficients of the CMB anisotropy and the seed's energy spectrum is derived. Magnitude and tilt of the observed anisotropies can be reproduced for the nearly scale-invariant axion spectra that are predicted in a particularly symmetric class of string cosmology backgrounds.
id cern-356090
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1998
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spelling cern-3560902023-03-14T17:58:23Zdoi:10.1016/S0370-2693(98)00833-8http://cds.cern.ch/record/356090engDurrer, R.Gasperini, M.Sakellariadou, M.Veneziano, G.Massless (pseudo-)scalar seeds of CMB anisotropyAstrophysics and AstronomyA primordial stochastic background of very weakly coupled massless (pseudo-)scalars can seed CMB anisotropy, when large-scale fluctuations of their stress-tensor re-enter the horizon during the matter-dominated era. A general relation between multipole coefficients of the CMB anisotropy and the seed's energy spectrum is derived. Magnitude and tilt of the observed anisotropies can be reproduced for the nearly scale-invariant axion spectra that are predicted in a particularly symmetric class of string cosmology backgrounds.A primordial stochastic background of very weakly coupled massless (pseudo-)scalars can seed CMB anisotropy, when large-scale fluctuations of their stress-tensor re-enter the horizon during the matter-dominated era. A general relation between multipole coefficients of the CMB anisotropy and the seed's energy spectrum is derived. Magnitude and tilt of the observed anisotropies can be reproduced for the nearly scale-invariant axion spectra that are predicted in a particularly symmetric class of string cosmology backgrounds.astro-ph/9806015DFTT-27-98CERN-TH-98-169CERN-TH-98-169oai:cds.cern.ch:3560901998-06-02
spellingShingle Astrophysics and Astronomy
Durrer, R.
Gasperini, M.
Sakellariadou, M.
Veneziano, G.
Massless (pseudo-)scalar seeds of CMB anisotropy
title Massless (pseudo-)scalar seeds of CMB anisotropy
title_full Massless (pseudo-)scalar seeds of CMB anisotropy
title_fullStr Massless (pseudo-)scalar seeds of CMB anisotropy
title_full_unstemmed Massless (pseudo-)scalar seeds of CMB anisotropy
title_short Massless (pseudo-)scalar seeds of CMB anisotropy
title_sort massless (pseudo-)scalar seeds of cmb anisotropy
topic Astrophysics and Astronomy
url https://dx.doi.org/10.1016/S0370-2693(98)00833-8
http://cds.cern.ch/record/356090
work_keys_str_mv AT durrerr masslesspseudoscalarseedsofcmbanisotropy
AT gasperinim masslesspseudoscalarseedsofcmbanisotropy
AT sakellariadoum masslesspseudoscalarseedsofcmbanisotropy
AT venezianog masslesspseudoscalarseedsofcmbanisotropy

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