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Titlebook: Generalized Perturbations in Modified Gravity and Dark Energy; Jonathan Pearson Book 2014 Springer International Publishing Switzerland 20

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发表于 2025-3-21 20:04:16 | 显示全部楼层 |阅读模式
书目名称Generalized Perturbations in Modified Gravity and Dark Energy
编辑Jonathan Pearson
视频video
概述Nominated as an outstanding Ph.D. thesis by the University of Manchester, UK.Offers a clear and pedagogical introduction to General Relativity, Cosmology and Modified Gravity.Presents physical interpr
丛书名称Springer Theses
图书封面Titlebook: Generalized Perturbations in Modified Gravity and Dark Energy;  Jonathan Pearson Book 2014 Springer International Publishing Switzerland 20
描述When predictions of Einstein‘s theory of General Relativity are compared against observations of our Universe, a huge inconsistency is found. The most popular fix for this inconsistency is to "invent" around 94% of the content of the universe: dark matter and dark energy. The dark energy is some exotic substance responsible for the apparent observed acceleration of the Universe. Another fix is to modify the theory of gravity: it is entirely plausible that Einstein‘s theory of General Relativity breaks down on cosmological scales, just as Newton‘s theory of gravity breaks down in the extreme gravitational field of the Sun. There are many alternative theories of gravity, each with the aim of describing observations of our Universe where General Relativity fails. Whether it is dark energy or some modified theory of gravity, it is clear that there is some "dark sector" in the Universe. In this thesis the author constructs a unifying framework for understanding the observational impact of general classes of dark sector theories, by formulating equations of state for the dark sector perturbations.
出版日期Book 2014
关键词Cosmology; Equations of State for Perturbations; General Relativity on Cosmological Scales; Interfacing
版次1
doihttps://doi.org/10.1007/978-3-319-01210-0
isbn_softcover978-3-319-34748-6
isbn_ebook978-3-319-01210-0Series ISSN 2190-5053 Series E-ISSN 2190-5061
issn_series 2190-5053
copyrightSpringer International Publishing Switzerland 2014
The information of publication is updating

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发表于 2025-3-21 20:35:43 | 显示全部楼层
(Re)Presenting Sherlock Holmes,for parameters which have a “large” effect on observables on “small” scales. It is rather unfortunate, however, that it is most natural for dark sector theories to induce modifications on large scales, since it is only at late times when the dark sector dominates when those large scale modes cross the horizon.
发表于 2025-3-22 01:38:53 | 显示全部楼层
发表于 2025-3-22 06:50:19 | 显示全部楼层
Observational Signatures of Generalized Cosmological Perturbations,for parameters which have a “large” effect on observables on “small” scales. It is rather unfortunate, however, that it is most natural for dark sector theories to induce modifications on large scales, since it is only at late times when the dark sector dominates when those large scale modes cross the horizon.
发表于 2025-3-22 10:45:14 | 显示全部楼层
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发表于 2025-3-22 17:37:11 | 显示全部楼层
https://doi.org/10.1007/978-3-319-72523-9urbations. However, the formalism can be applied in much more diverse systems where relativistic field theories play a central role, such as massive gravities, inflation and even effective theories for quantum gravity.
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发表于 2025-3-23 06:46:58 | 显示全部楼层
The Effective Action Formalism for Cosmological Perturbations,, supernovae, baryon acoustic oscillations, gravitational lensing and structure formation point to the existence of an additional component dubbed “dark energy”, or a modification to gravity, which needs to be introduced to explain the the observed acceleration [1–5].
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