Evolution of primordial perturbations and a fluctuating decay rate
نویسندگان
چکیده
منابع مشابه
Primordial perturbations from inflation
I review the standard analysis of adiabatic scalar and tensor perturbations produced by slow-roll inflation driven by a single scalar field, before going on to discuss recent work on the role of non-adiabatic modes during and after inflation. Isocurvature perturbations correlated with adiabatic modes may be produced during multi-field inflation and would give valuable information about the phys...
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The promotion of cosmology from an area of speculation to an area of observation and measurement is one of the most remarkable developments in the history of human knowledge. Starting at an ‘initial’ temperature of a few MeV, the observable Universe is understood in considerable detail (we are setting ~ = c = kB = 1). At the initial epoch the expanding Universe is an almost isotropic and homoge...
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We suggest here a mechanism for the seeding of the primordial density fluctuations. We point out that a process like reheating at the end of inflation will inevitably generate perturbations, even on superhorizon scales, by the local diffusion of energy. Provided that the reheating temperature is of order the GUT scale, the density contrast δR for spheres of radius R will be of order 10 −5 at ho...
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چکیده ندارد.
15 صفحه اولScalar perturbations in a primordial inflationary scenario
We compute the spectral index for scalar perturbations generated in a primordial inflationary model. In this model, the transition of the inflationary phase to the radiative era is achieved through the decay of the cosmological term leading a second order phase transition and the characteristics of the model allow to implement a set of initial conditions where the perturbations display a therma...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2003
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2003.08.053