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Delta N Formalism in Cosmological Perturbation Theory, Sasaki Misao, Naruko Atsushi, Abolhasani Ali Akbar


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Автор: Sasaki Misao, Naruko Atsushi, Abolhasani Ali Akbar
Название:  Delta N Formalism in Cosmological Perturbation Theory
ISBN: 9789813238756
Издательство: World Scientific Publishing
Классификация:
ISBN-10: 9813238755
Обложка/Формат: Hardback
Страницы: 184
Вес: 0.41 кг.
Дата издания: 30.01.2019
Серия: Physics
Язык: English
Размер: 159 x 237 x 12
Читательская аудитория: Tertiary education (us: college)
Ключевые слова: Astronomy, space & time, SCIENCE / Physics / Astrophysics,SCIENCE / Physics / Relativity,SCIENCE / Cosmology
Рейтинг:
Поставляется из: Англии
Описание:

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.




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