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

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High Derivative Theories,urbations. 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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Book 2014is 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.

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Introduction to Gravitational Theories and Cosmology,eps objects firmly planted on the surface of the earth. Whilst gravity is the weakest of the fundamental forces, it is gravity which dictates the structure and shape of the universe on a vast range of scales.

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The Effective Action Formalism for Cosmological Perturbations,he geometry and matter content of cold dark matter (CDM)/photons/baryons to describe its constituents. Observations of the cosmic microwave background, supernovae, baryon acoustic oscillations, gravitational lensing and structure formation point to the existence of an additional component dubbed “da

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High Derivative Theories,sistent modifications to the gravitational field equations at perturbed order for modified gravity and dark energy theories from a Lagrangian for perturbations. However, the formalism can be applied in much more diverse systems where relativistic field theories play a central role, such as massive g

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Connections to Massive Gravity,or what has become called .. In this paper we will focus on what is the simplest subset of such theories, in which the dark sector Lagrangian is only a function of the metric (and no extra derivatives thereof) following the approach discussed in [.]