Souradeep, Tarun ; Sahni, Varun
(1992)
*Density perturbation, garvity waves and the cosmic microwave background*
Modern Physics Letters A, 7
(38).
pp. 3541-3551.
ISSN 0217-7323

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Official URL: http://www.worldscinet.com/mpla/07/0738/S021773239...

Related URL: http://dx.doi.org/10.1142/S0217732392002950

## Abstract

We assess the contribution to the observed large scale anisotropy of the cosmic microwave background radiation, arising from both gravity waves as well as adiabatic density perturbations, generated by a common inflationary mechanism in the early Universe. We find that for inflationary models predicting power law primordial spectra |δ_{k}|^{2}∝k^{n}, the relative contribution to the quadrupole anisotropy from gravity waves and scalar density perturbations, depends crucially upon n. For n<0.84, gravity waves perturb the CMBR by a larger amount than density perturbations, whereas for n>0.84 the reverse is true. Normalizing the amplitude of the density perturbation spectrum at large scales, using the observed value of the COBE quadrupole, we determine (δM/M)_{16}-the rms density contrast on scales ∼ 16h_{50}^{−1} Mpc, for cosmological models with cold dark matter. We find that for n>0.75, a large amount of biasing is required in order to reconcile theory with observations. We also determine the value of the inflationary Hubble parameter and the COBE-normalized amplitude and spectrum of gravity waves from inflation.

Item Type: | Article |
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Source: | Copyright of this article belongs to World Scientific Publishing Company. |

Keywords: | PACS Numbers: 98.70.Vc, 04.30+x, 98.80, 98.60.Ac |

ID Code: | 46258 |

Deposited On: | 04 Jul 2011 11:09 |

Last Modified: | 04 Jul 2011 11:09 |

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