Zobrazeno 1 - 10
of 118
pro vyhledávání: '"Rigopoulos G"'
Publikováno v:
JCAP 0810:013,2008
We argue that the curvaton decay takes place most naturally by way of a broad parametric resonance. The mechanism is analogous to resonant inflaton decay but does not require any tuning of the curvaton coupling strength to other scalar fields. For lo
Externí odkaz:
http://arxiv.org/abs/0807.0382
Publikováno v:
JCAP 0804:025,2008
We discuss the infrared divergences that appear to plague cosmological perturbation theory. We show that within the stochastic framework they are regulated by eternal inflation so that the theory predicts finite fluctuations. Using the $\Delta N$ for
Externí odkaz:
http://arxiv.org/abs/0802.0395
Publikováno v:
Phys.Rev.D76:083512,2007
After simplifying and improving the non-Gaussian formalism we developed in previous work, we derive a quantitative expression for the three-point correlator (bispectrum) of the curvature perturbation in general multiple-field inflation models. Our re
Externí odkaz:
http://arxiv.org/abs/astro-ph/0511041
Publikováno v:
Phys.Rev.D73:083522,2006
We investigate non-Gaussianity in general multiple-field inflation using the formalism we developed in earlier papers. We use a perturbative expansion of the non-linear equations to calculate the three-point correlator of the curvature perturbation a
Externí odkaz:
http://arxiv.org/abs/astro-ph/0506704
Publikováno v:
Phys.Rev. D73 (2006) 083521
We develop a non-linear framework for describing long-wavelength perturbations in multiple-field inflation. The basic variables describing inhomogeneities are defined in a non-perturbative manner, are invariant under changes of time slicing on large
Externí odkaz:
http://arxiv.org/abs/astro-ph/0504508
Publikováno v:
Phys.Rev. D72 (2005) 083507
We present a simple way to calculate non-Gaussianity in inflation using fully non-linear equations on long wavelengths with stochastic sources to take into account the short-wavelength quantum fluctuations. Our formalism includes both scalar metric a
Externí odkaz:
http://arxiv.org/abs/astro-ph/0410486
Autor:
Rigopoulos, G. I., Shellard, E. P. S.
Publikováno v:
JCAP 0510 (2005) 006
We present a method by which cosmological perturbations can be quantitatively studied in single and multi-field inflationary models beyond linear perturbation theory. A non-linear generalization of the gauge-invariant Sasaki-Mukhanov variables is use
Externí odkaz:
http://arxiv.org/abs/astro-ph/0405185
Autor:
Rigopoulos, G. I., Shellard, E. P. S.
Publikováno v:
Phys.Rev.D68:123518,2003
In this letter we review the separate universe approach for cosmological perturbations and point out that it is essentially the lowest order approximation to a gradient expansion. Using this approach, one can study the nonlinear evolution of inhomoge
Externí odkaz:
http://arxiv.org/abs/astro-ph/0306620
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Akademický článek
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