Jain, Rajeev Kumar ; Chingangbam, Pravabati ; Gong, Jinn-Ouk ; Sriramkumar, L. ; Souradeep, Tarun (2009) Punctuated inflation and the low CMB multipoles Journal of Cosmology and Astroparticle Physics, 2009 (01). Article ID JCAP01(2009)009. ISSN 1475-7516
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Official URL: http://iopscience.iop.org/article/10.1088/1475-751...
Related URL: http://dx.doi.org/10.1088/1475-7516/2009/01/009
Abstract
We investigate inflationary scenarios driven by a class of potentials which are similar in form to those that arise in certain minimal supersymmetric extensions of the standard model. We find that these potentials allow a brief period of departure from inflation sandwiched between two stages of slow roll inflation. We show that such a background behavior leads to a step like feature in the scalar power spectrum. We set the scales such that the drop in the power spectrum occurs at a length scale that corresponds to the Hubble radius today — a feature that seems necessary to explain the lower power observed in the quadrupole moment of the Cosmic Microwave Background (CMB) anisotropies. We perform a Markov Chain Monte Carlo analysis to determine the values of the model parameters that provide the best fit to the recent WMAP 5-year data for the CMB angular power spectrum. We find that an inflationary spectrum with a suppression of power at large scales that we obtain leads to a much better fit (with just one extra parameter, χeff2 improves by 6.62) of the observed data when compared to the best fit reference ΛCDM model with a featureless, power law, primordial spectrum.
Item Type: | Article |
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Source: | Copyright of this article belongs to Institute of Physics. |
ID Code: | 107364 |
Deposited On: | 26 Dec 2017 06:55 |
Last Modified: | 26 Dec 2017 06:55 |
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