Title  Generalized perturbations in modified gravity and dark energy 
Author(s)  Jonathan Pearson 
Description  1 online resource (xix, 200 pages) : illustrations (some color) 
Abstract Note  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 
Contents Note  Gravitational theories and cosmology  The effective action formalism for cosmological perturbations  Metric only and first order scalar field theory  High derivative theories  Explicit theories  Connections to massive gravity  Generalized fluid description  Observational signatures of generalized cosmological perturbations  Discussion and final remarks 
Notes  Includes bibliographical references 
Keyword(s)  1. Classical and Quantum Gravitation, Relativity Theory
2. COSMOLOGY
3. Dark energy (Astronomy)
4. EBOOK
5. EBOOK  SPRINGER
6. GENERAL RELATIVITY (PHYSICS)
7. GRAVITATION
8. Mathematical Applications in the Physical Sciences
9. PERTURBATION (ASTRONOMY)
10. PHYSICS
11. SCIENCE / Astronomy

Item Type  eBook 