Topic
Gravitation
About: Gravitation is a research topic. Over the lifetime, 29306 publications have been published within this topic receiving 821510 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the Schrodinger-type equation for odd-parity perturbations on a background geometry has been extended to the even-PARITY perturbation, which should greatly simplify the analysis for calculations of gravitational radiation from stars and from objects falling into black holes.
Abstract: The Schr\"odinger-type equation for odd-parity perturbations on a background geometry has been extended to the even-parity perturbations. This should greatly simplify the analysis for calculations of gravitational radiation from stars and from objects falling into black holes.
918 citations
Book•
01 Jan 2003TL;DR: The scalar-tensor theory of gravitation is one of the most popular alternatives to Einstein's theory of gravity as mentioned in this paper, and it has been studied extensively in cosmology, gravitation and astronomy.
Abstract: The scalar-tensor theory of gravitation is one of the most popular alternatives to Einstein's theory of gravitation. This book provides a clear and concise introduction to the theoretical ideas and developments, exploring scalar fields and placing them in context with a discussion of Brans-Dicke theory. Topics covered include the cosmological constant problem, time variability of coupling constants, higher dimensional space-time, branes and conformal transformations. The authors emphasize the physical applications of the scalar-tensor theory and thus provide a pedagogical overview of the subject, keeping more mathematically detailed sections for the appendices. This book is suitable for graduate courses in cosmology, gravitation and relativity. It will also provide a valuable reference for researchers.
917 citations
TL;DR: The present acceleration of the Universe strongly indicated by recent observational data can be modeled in the scope of a scalar-tensor theory of gravity by determining the structure of this theory along with the present density of dustlike matter from two observable cosmological functions.
Abstract: The present acceleration of the Universe strongly indicated by recent observational data can be modeled in the scope of a scalar-tensor theory of gravity. We show that it is possible to determine the structure of this theory along with the present density of dustlike matter from two observable cosmological functions: the luminosity distance and the linear density perturbation in the dustlike matter component as functions of redshift. Explicit results are presented in the first order in the small inverse Brans-Dicke parameter ${\ensuremath{\omega}}^{\ensuremath{-}1}$.
912 citations
TL;DR: A review of the state of the art in the field of modified gravity can be found in this article, where the authors identify the guiding principles for rigorous and consistent modifications of the standard model, and discuss the prospects for empirical tests.
909 citations
TL;DR: In this article, the authors measured the time delays between transmission of radar pulses towards either of the inner planets (Venus or Mercury) and detection of the echoes and showed that the speed of a light wave depends on the strength of the gravitational potential along its path, and that these time delays should be increased by almost 2x10$^{-4}$ sec when the radar pulses pass near the sun.
Abstract: Recent advances in radar astronomy have made possible a fourth test of Einstein's theory of general relativity. The test involves measuring the time delays between transmission of radar pulses towards either of the inner planets (Venus or Mercury) and detection of the echoes. Because, according to the general theory, the speed of a light wave depends on the strength of the gravitational potential along its path, these time delays should thereby be increased by almost 2x10$^{-4}$ sec when the radar pulses pass near the sun. Such a change, equivalent to 60 km in distance, could now be measured over the required path length to within about 5 to 10% with presently obtainable equipment.
906 citations