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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.
Probes and tests of strongfield gravity with observations in the electromagnetic spectrum. Living Rev. Relativity
"... Neutron stars and black holes are the astrophysical systems with the strongest gravitational fields in the universe. In this article, I review the prospect of probing with observations of such compact objects some of the most intriguing General Relativistic predictions in the strongfield regime: th ..."
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Neutron stars and black holes are the astrophysical systems with the strongest gravitational fields in the universe. In this article, I review the prospect of probing with observations of such compact objects some of the most intriguing General Relativistic predictions in the strongfield regime: the absence of stable circular orbits near a compact object and the presence of event horizons around blackhole singularities. I discuss the need for a theoretical framework within which future experiments will provide detailed, quantitative tests of gravity theories. Finally, I summarize the constraints imposed by current observations of neutron stars on potential deviations from General Relativity. 1 1
Approaches to understanding cosmic acceleration
"... Abstract. Theoretical approaches to explaining the observed acceleration of the universe are reviewed. We briefly discuss the evidence for cosmic acceleration, and the implications for standard General Relativity coupled to conventional sources of energymomentum. We then address three broad methods ..."
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Abstract. Theoretical approaches to explaining the observed acceleration of the universe are reviewed. We briefly discuss the evidence for cosmic acceleration, and the implications for standard General Relativity coupled to conventional sources of energymomentum. We then address three broad methods of addressing an accelerating universe: the introduction of a cosmological constant, its problems and origins; the possibility of dark energy, and the associated challenges for fundamental physics; and the option that an infrared modification of general relativity may be responsible for the largescale behavior of the universe. Approaches to Understanding Cosmic Acceleration 2 1.
From Dark Energy & Dark Matter to Dark Metric by
, 805
"... Abstract: It is nowadays clear that General Relativity cannot be the definitive theory of Gravitation. The attempts to recover it, with respect to the latest observative data, lead in fact to very strange physical entities as the Dark Energy & Dark Matter. On the other hand, the attempts to prod ..."
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Abstract: It is nowadays clear that General Relativity cannot be the definitive theory of Gravitation. The attempts to recover it, with respect to the latest observative data, lead in fact to very strange physical entities as the Dark Energy & Dark Matter. On the other hand, the attempts to produce generalized theories give rise to mathematical difficulties
One gravitational potential or two? Forecasts and tests
"... The metric of a perturbed Robertson–Walker space–time is characterized by three functions: a scalefactor giving the expansion history and two potentials that generalize the single potential of Newtonian gravity. The Newtonian potential induces peculiar velocities and, from these, the growth of matt ..."
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The metric of a perturbed Robertson–Walker space–time is characterized by three functions: a scalefactor giving the expansion history and two potentials that generalize the single potential of Newtonian gravity. The Newtonian potential induces peculiar velocities and, from these, the growth of matter fluctuations. Massless particles respond equally to the Newtonian potential and to a curvature potential. The difference of the two potentials, called the gravitational slip, is predicted to be very small in general relativity, but can be substantial in modified gravity theories. The two potentials can be measured, and gravity tested on cosmological scales, by combining weak gravitational lensing or the integrated Sachs–Wolfe effect with galaxy peculiar velocities or clustering.
On modified gravity
 Proceedings in Mathematics and Statistics 36
, 2013
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Review Conformal Relativity versus Brans–Dicke and Superstring Theories
, 2012
"... entropy ..."
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Review Evolving Black Hole Horizons in General Relativity and Alternative Gravity
, 2013
"... galaxies ..."
Filtering out the cosmological constant in the Palatini formalism of
"... modified gravity ..."
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