Non-Linear Cosmological Perturbations PDF Download
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Author: Hooshyar Assadullahi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Hooshyar Assadullahi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Román Scoccimarro
Publisher:
ISBN:
Category : Nonlinear theories
Languages : en
Pages : 90
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Author: Samuel Edward David Lawrence
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Diego Blas
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Ali Akbar Abolhasani
Publisher: World Scientific
ISBN: 9813238771
Category : Science
Languages : en
Pages : 182
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Book Description
Early Universe cosmology is an active area of research and cosmic inflation is a pillar of modern cosmology. Among predictions of inflation, observationally the most important one is the generation of cosmological perturbations from quantum vacuum fluctuations that source all inhomogeneous structures in the Universe, not to mention the large-scale structures such as clusters of galaxies.Cosmological perturbation theory is the basic tool to study the perturbations generated from inflation. There are a few different approaches to primordial cosmological perturbations. In the conventional approach one perturbs the field equations and after quantizing the perturbations by the use of the corresponding action, one calculates the power spectrum of cosmological observables. This approach extends to higher order perturbations such as bispectrum etc., but the analysis becomes increasingly difficult.The delta N formalism, the topic of this book, is an alternative approach. The novelty of this approach is that, under the condition that the scale of interest is very large so that the spatial derivatives may be ignored in the dynamics, it can be applied to all orders in perturbation theory and has a rigorous foundation in general relativity. Thanks to the fact that one can evaluate perturbations with only the knowledge of background solutions, it is proved to be much easier than the conventional approach in evaluating higher order effects in many cases.
Author: Stefano Anselmi
Publisher:
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Category :
Languages : en
Pages :
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Author: Andrew Howard Jaffe
Publisher:
ISBN:
Category : Mechanics, Analytic
Languages : en
Pages : 98
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Author: Muhammad Akashi
Publisher:
ISBN:
Category :
Languages : en
Pages : 80
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Author: Claudio Llinares
Publisher:
ISBN: 9789036747608
Category :
Languages : en
Pages :
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Author: Shohei Saga
Publisher: Springer
ISBN: 9811080070
Category : Science
Languages : en
Pages : 143
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This thesis sheds valuable new light on the second-order cosmological perturbation theory, extensively discussing it in the context of cosmic microwave background (CMB) fluctuations. It explores the observational consequences of the second-order vector mode, and addresses magnetic field generation and the weak lensing signatures, which are key phenomena of the vector mode. The author demonstrates that the second-order vector mode, which never appears at the linear-order level, naturally arises from the non-linear coupling of the first-order scalar modes. This leads to the remarkable statement that the vector-order mode clearly contributes to the generation of cosmological magnetic fields. Moreover, the weak lensing observations are shown to be accessible to the vector mode. On the basis of ongoing and forthcoming observations, the thesis concludes that the second-order vector mode is detectable.
