Padmanabhan, T. ; Seshadri, T. R. ; Singh, T. P. (1989) Making inflation work: damping of density perturbations due to Planck energy cutoff Physical Review D - Particles, Fields, Gravitation and Cosmology, 39 (8). pp. 2100-2107. ISSN 1550-7998
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Official URL: http://prd.aps.org/abstract/PRD/v39/i8/p2100_1
Related URL: http://dx.doi.org/10.1103/PhysRevD.39.2100
Abstract
In this paper we propose an alternative method for the computation of classical density perturbations from a quantum field in an inflationary scenario. We compute the power spectrum of density perturbations directly from vacuum fluctuations of the "time-time" component of the energy-momentum tensor. We compute the inhomogeneous part of the correlation function <0‖T00(x,t) T00(y,t)‖0> for a massless minimally coupled scalar field in de Sitter space. The Fourier transform of this two-point function leads to the scale-invariant spectrum of perturbations, but is ultraviolet divergent. This expression can be made finite by introducing an (ad hoc) small-distance cutoff in the proper length. We argue that this cutoff should be of the order of the Planck length, and show that, in such a case, the density fluctuations have the acceptable magnitude (∼10-4) for the case of primordial inflation. Thus the inflationary scenario can be made to work without any fine-tuning.
Item Type: | Article |
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Source: | Copyright of this article belongs to The American Physical Society. |
ID Code: | 72456 |
Deposited On: | 29 Nov 2011 05:22 |
Last Modified: | 29 Nov 2011 05:22 |
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