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23
Modified Gravity and Cosmology
, 2012
"... In this review we present a thoroughly comprehensive survey of recent work on modified theories of gravity and their cosmological consequences. Amongst other things, we cover General Relativity, ScalarTensor, EinsteinAether, and Bimetric theories, as well as TeVeS, f(R), general higherorder theo ..."
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In this review we present a thoroughly comprehensive survey of recent work on modified theories of gravity and their cosmological consequences. Amongst other things, we cover General Relativity, ScalarTensor, EinsteinAether, and Bimetric theories, as well as TeVeS, f(R), general higherorder theories, HořavaLifschitz gravity, Galileons, Ghost Condensates, and models of extra dimensions including KaluzaKlein, RandallSundrum, DGP, and higher codimension braneworlds. We also review attempts to construct a Parameterised PostFriedmannian formalism, that can be used to constrain deviations from General Relativity in cosmology, and that is suitable for comparison with data on the largest scales. These subjects have been intensively studied over the past decade, largely motivated by rapid progress in the field of observational cosmology that now allows, for the first time, precision tests of fundamental physics on the scale of the observable Universe. The purpose of this review is to provide a reference tool for researchers and students in cosmology and gravitational physics, as well as a selfcontained, comprehensive and uptodate introduction to the subject as a whole.
Entropy Bound and Causality Violation in Higher Curvature Gravity
, 808
"... Preprint typeset in JHEP style PAPER VERSION arXiv:0808.1919 ..."
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Preprint typeset in JHEP style PAPER VERSION arXiv:0808.1919
EinsteinGaussBonnet metrics: black holes, black strings and a staticity theorem.
, 906
"... Abstract: We find the general solution of the 6dimensional EinsteinGaussBonnet equations in a large class of space and timedependent warped geometries. Several distinct families of solutions are found, some of which include black string metrics, space and timedependent solutions and black holes ..."
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Abstract: We find the general solution of the 6dimensional EinsteinGaussBonnet equations in a large class of space and timedependent warped geometries. Several distinct families of solutions are found, some of which include black string metrics, space and timedependent solutions and black holes with exotic horizons. Among these, some are shown to verify a Birkhoff type staticity theorem, although here, the usual assumption of maximal symmetry on the horizon is relaxed, allowing exotic horizon geometries. We provide explicit examples of such static exotic black holes, including ones whose horizon geometry is that of a Bergman space. We find that the situation is very different from higherdimensional general relativity, where Einstein spaces are admissible black hole horizons and the associated black hole potential is not even affected. In EinsteinGaussBonnet theory, on the contrary, the nontrivial Weyl tensor of such exotic horizons is exposed to the bulk dynamics through the higher order GaussBonnet term, severely constraining the allowed horizon geometries and adding a novel chargelike parameter to the black hole potential. The latter is related to the Euler characteristic of the fourdimensional horizon and provides, in some cases, additional
Higher Curvature Gravity: Entropy Bound and Causality Violation
, 808
"... Preprint typeset in JHEP style PAPER VERSION arXiv:0808.1919 ..."
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Preprint typeset in JHEP style PAPER VERSION arXiv:0808.1919
The Lovelock Black Holes
, 805
"... Lovelock theory is a natural extension of Einstein theory of gravity to higher dimensions, and it is of great interest in theoretical physics as it describes a wide class of models. In particular, it describes string theory inspired ultraviolet corrections to EinsteinHilbert action, while admits th ..."
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Lovelock theory is a natural extension of Einstein theory of gravity to higher dimensions, and it is of great interest in theoretical physics as it describes a wide class of models. In particular, it describes string theory inspired ultraviolet corrections to EinsteinHilbert action, while admits the Einstein general relativiy and the so called ChernSimons theories of gravity as particular cases. Here, we give an introduction to the black hole solutions of Lovelock theory and analyze their most important properties. These solutions can be regarded as generalizations of the BoulwareDeser solution of EinsteinGaussBonnet gravity, which we discuss in detail here. We briefly discuss some recent progress in understading these and other solutions, like topological black holes that represent black branes of the theory, and vacuum thinshell wormholelike geometries that connect two different asymptotically deSitter spaces. We also make some comments on solutions with timelike Lovelock theory is the most general metric theory of gravity yielding conserved second order equations of motion in arbitrary number of dimensions D. In turn, it is the natural generalization
Evolving Black Hole Horizons in General Relativity and Alternative Gravity
 GALAXIES
, 2013
"... ..."
Higher Derivative Corrections, Consistent Truncations, and IIB Supergravity
, 2011
"... To my parents. ii ACKNOWLEDGEMENTS First and foremost I would like to thank my thesis advisor, Jim Liu, for his guidance and support throughout my graduate career. His physical insights and detailed explanations have helped to shape me as a physicist and scientist in general. Secondly, I would like ..."
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To my parents. ii ACKNOWLEDGEMENTS First and foremost I would like to thank my thesis advisor, Jim Liu, for his guidance and support throughout my graduate career. His physical insights and detailed explanations have helped to shape me as a physicist and scientist in general. Secondly, I would like to extend gratitude to my collaborators: Sera Cremonini, Kentaro Hanaki, and Zhichen Zhao; without whom my graduate career would have been much less fruitful. I am particularly grateful for the encouragement and many engaging conversations with Sera Cremonini. Furthermore, I would like to thank professors Leopoldo Pando Zayas, Finn Larsen, Henriette Elvang, Aaron Pierce, Gordon Kane, James Wells, and Ratindranath Akhoury for the physics that I have learned from them both through conversation and in various courses. I also wish to thank my undergraduate advisor Keith Riles for taking me in as a young researcher and giving me a glimpse of the world of experimental gravitational wave physics.
and field redefinitions
, 806
"... Higher derivative corrections to Rcharged AdS5 black holes ..."
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