Stochastic inflation and the lower multipoles in the CMB anisotropies
[EN]We extend the formalism of stochastic inflation, with non-Markovian coloured noise, to describe the gauge-invariant comoving curvature perturbation. We compute the power-spectrum of perturbations in this framework, after constraining the coarse-grained field to vanish when our local patch exited...
| Autores: | , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2004 |
| País: | España |
| Recursos: | Universidad de Salamanca (USAL) |
| Repositorio: | GREDOS. Repositorio Institucional de la Universidad de Salamanca |
| OAI Identifier: | oai:gredos.usal.es:10366/169090 |
| Acesso em linha: | http://hdl.handle.net/10366/169090 |
| Access Level: | acceso abierto |
| Palavra-chave: | Fondo Cósmico de Microondas (teoría) Perturbaciones cosmológicas Inflación Universo primordial |
| Resumo: | [EN]We extend the formalism of stochastic inflation, with non-Markovian coloured noise, to describe the gauge-invariant comoving curvature perturbation. We compute the power-spectrum of perturbations in this framework, after constraining the coarse-grained field to vanish when our local patch exited the Hubble radius, in order to remove the unobservable monopole. We find a blue tilt of the power-spectrum on the largest observable scales, in agreement with CMB data, which show a suppression of the low multipoles of the anisotropy. Our explanation of the anomalous behaviour of the lower multipoles of the CMB anisotropies does not require any ad-hoc new physical ingredients in the theory. |
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