DELTA N FORMALISM IN COSMOLOGICAL PERTURBATION THEORY
Blues: la musica del delta del mississippi
- ISBN: 9789813238756
- Encuadernación: Sin formato definido
Namibie escapade au delta de lokavango 2019 petit fute offr (edición en francés)
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 largescale structures such as clusters of galaxiesCosmological 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 difficultThe 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
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