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Topic: Brans-Dicke theory

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Brans Gravitational Radiation. In The Einstein, Brans-dicke And Rosen Bi-metric Theories. Joseph H. Tay Conformal relativity versus Brans-Dicke and superstring theories Conformal relativity versus Brans-Dicke and superstring theories Conformal relativity theory which is also known as Hoyle-Narlikar theory has recently been given some new. Black hole area in Brans-Dicke theory Black hole area in Brans-Dicke theory We have shown that the dynamics of the scalar field OE(x) = "G Gamma1 (x)" in BransDicke theories of gravity makes the surface area of the black hole horizon. Get essential info about this lawyer - biography, background, education etc. Black hole area in Brans-Dicke theory. www.99hosted.com /names6177.html

ASP: A Radical in Tweeds: Robert H. Dicke and the General Theory of Relativity Robert H. Dicke, professor of physics at Princeton University, is by no means a crank, but one of the foremost experimentalists of his time, and by the mid-1950s he had become very skeptical about the empirical evidence for Einstein's General Theory of Relativity. Dicke decided to reexamine the most convincing proof of the Theory, its exact prediction of the anomalous precession of Mercury's orbit. If Dicke ever feels disappointed in not finding flaws in General Relativity, he can look back with satisfaction on a career that sparked intense interest in experimental relativity, that created a theoretical framework in which all relativistic theories might be compared, and that trained a corp of brilliant experimentalists. www.astrosociety.org /pubs/mercury/9404/dicke.html

Physics department making headway at the speed of light Such structures seem to be forbidden by Einstein's standard theory, but may be possible in the one suggested by Brans and Dicke. The data collected suggested that the Brans-Dicke theory was not valid in its original form. In addition to performing research on scalar-tensor theories, Brans, along with Duane Randall, professor in Loyola's math department and recipient of the Rev. John F. Keller, S.J., Distinguished Professorship, are investigating the possible physical significance of recent mathematical discoveries in differential topology. www.loyno.edu /newsandcalendars/loyolatoday/2000/11/physicsdept.html

Gravitational radiation in the Einstein, Brans-Dicke and Rosen bi-metric theories The essential feature of the Brans-Dicke theory is that the gravitational "constant" G is in fact not a constant but is determined by the totality of matter in the universe through an auxiliary scalar field equation.   While the gravitational constant does not vary with space-time position as in the Brans-Dicke theory, the energy-momentum tensor in the field equations is scaled by the square-root of the ratio of the determinants of the two metrics. Brans and R. Dicke, Phys, Rev., 124, 925 (1961). www.davis-inc.com /relativity

Brans dicke Brans - Dicke theory may explain the present accelerated expansion of the... Brans and Dicke (1961) have formulated a scalar-tensor theory. feature of the Brans - Dicke theory is that the gravitational "constant" G is in... adult-toplist.net /brans-dicke.html

GR and Mercury's Orbital Precession The Brans-Dicke scalar-tensor theory of gravity could handle the discrepancy, via its adjustable parameter. Dicke and Goldenberg claimed to have detected a much larger bulge than solar models predicted, large enough to destroy the agreement between GR and Mercury's orbit, but not large enough to permit a Newtonian explanation. 343, 526 (1989), which is cited by Will in the 1993 revision of his more technical book, "Theory and experiment in gravitational physics". www2.corepower.com:8080 /~relfaq/mercury_orbit.html

Jordan-Brans-Dicke Quantum Wormholes and Coleman's Mechanism -- from Mathematica Information Center We consider the quantum gravity and cosmology of a Jordan-Brans-Dicke theory, predicted by string effective actions. Following Coleman's mechanism, we find a probability distribution which is strongly peaked at zero cosmological constant and infinite Brans-Dicke parameter. That is, we recover general relativity as the effective low energy theory of gravity. library.wolfram.com /infocenter/Articles/3352

Could someone explain Brans-Dicke theory? - Information Technology Services It's a fairly tunable theory, so it's hard to distinguish its predictions experimentally from the predictions of GR; as far as existing experiments are concerned, either theory could be right (but Brans-Dicke is more complicated, and the scalar field needed to comply with experiment seems kind of artificial). Brans-Dicke theory is "Machian" in the "Mach1" sense of that paper: Newton's gravitational constant is not really constant, but is a dynamical field. In particular, I believe that scalar-tensor theories can account for the expansion of the universe without resorting to dark matter, but they run into problems with at least one of the other phenomena. www.physicsforums.com /archive/t-7894_Could_someone_explain_Brans-Dicke_theory?.html

Observational and Experimental Evidence Bearing on General Relativity Theory of Slowly Varying Fields: in general, this restriction reduces a relativistic classical field theory (with a Lorentz-covariant field equation) to a simpler nonrelativistic classical field theory, which a field equation which is not Lorentz-covariant. Theory of Source-Free Fields: in general, this restriction reduces a relativistic classical field theory, with a Lorentz-covariant and possibly nonlinear field equation, to a simpler relativistic classical field theory, with a field equation which is Lorentz-covariant and also linear. For example, Maxwell's theory of electromagnetism, which is a relativistic classical field theory, is known to be the classical limit of quantum electrodynamics (QED), a relativistic QFT which is often cited as the most accurate physical theory of all time. math.ucr.edu /home/baez/RelWWW/tests.html

Loyola University New Orleans professor and Harahan resident does research in Germany - Loyola University New Orleans Brans is known for his research in Einstein’s General Relativity and in the Brans-Dicke theory, an extension of the Einstein theory. (New Orleans)—Professor of Physics at Loyola University New Orleans Carl H. Brans is pursuing research on Relativity, Gravitation and Computer Algebra at the Institute for Theoretical Physics in Germany. Particularly, his research focuses on the role of scalar fields in physics and the implications of differential topology for space-time geometry. www.loyno.edu /newsandcalendars/release.php?id=337

Gamma-Ray Bursts in Brans-Dicke theory Gamma-Ray Bursts (GRBs) production is discussed in the framework of the Brans-Dicke (BD) theory of gravity. Constraints on parameters entering the BD theory are fixed in order to reproduce the typical outputs energy of GRBs. We derive the effective potential and the acceleration of a scalar particle propagating in a gravitational field described by BD theory. www.edpsciences.org /articles/epl/abs/2002/14/7180/7180.html

Astron. Astrophys. 325, 893-897 (1997) Age of the universe constrained from the primordial nucleosynthesis in the Brans-Dicke theory with a varying cosmological term and a parameter characteristic to the Brans-Dicke theory. Characteristic feature of the Brans-Dicke theory with a varying aa.springer.de /papers/7325003/2300893/small.htm

What Makes A Theory Scientific? The theory is falsifiable: If things were not the way they are, it would be proven false. The big question about a theory is whether it's right or wrong. If they didn't, then his theory would be falsified. www.don-lindsay-archive.org /creation/falsify.html

Spring 2003 The course is intended as an introduction to the theory of General Relativity. No prior knowledge of General Relativity will be assumed, but some knowledge of special relativity and vector analysis is required; undergraduate and first year graduate students require consent of the instructor. aeneas.ps.uci.edu /hamber/cour_255.htm

Unification Field Theory and Cosmology BRST quantization of vector and axial-vector gauge theory (Dae Sung Hwang and Chang-Yeong Lee) Phys. Thermodynamics of non-relativistic scattering theory (Changrim Ahn, Kong-Ju-Bok Lee and Soonkeon Nam) J. Korean Phys. Virasoro invariance and theory of internal string (Y.M. Cho and S.W. Zoh) Phys. ctp.snu.ac.kr /unified

Recent Papers The theory is based upon variational determination of a correlated density matrix suitable for description of both normal and superfluid phases, within an approach that extends to finite temperatures the very successful correlated wave-functions theory of the ground state and elementary excitations at zero temperature. We study gravitational theory in 1+2 spacetime dimensions which is determined by the Lagrangian constructed as a sum of the Einstein-Hilbert term plus the two (translational and rotational) gravitational Chern-Simons terms. The color-flavor transformed theory is expressed in terms of gauge singlets, the meson fields, organized into sectors distinguished by the distribution of baryonic flux. www.thp.uni-koeln.de /Research/papers.html

Citebase - Quintessence Problem and Brans-Dicke Theory It has been shown that Brans-Dicke (BD) theory in anisotropic cosmological model can alone solve the quintessence problem and we have accelerated expanding universe without any quintessence matter. Based on the argument that any consistent effective theory of spacetime must be invariant under the one-parameter group of transformations of the units of length, time and... The bubbles are given in terms of an exact, spherically symmetric thin shell solution to the Einstein equations in a Weyl-Dirac theory... citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:gr-qc/0306040

[No title] 1) the reason why we write a paper only in Brans-Dicke This project is an extension of the equilibrium study of boson stars in scalar-tensor theory (Greg Comer and HS). Formation of boson stars in Brans-Dicke theory 6. We find that the dynamical behavior of boson stars in BD theory is quite similar to those in general relativity (GR), and the scalar wave emission from the system is slightly supressed. wugrav.wustl.edu /research/projects/old_cocoboard/S-T/00003

Entry Johri:1978:ESB from jmathphys1975.bib Dicke, Brans-, 18(2) 289, 19(2) 442, 19(6) 1423, 20(1) 23, 20(7) 1494, 20(9) 1908, 20(11) 2280 Brans, 18(2) 289, 19(2) 442, 19(6) 1423, 20(1) 23, 20(7) 1494, 20(9) 1908, 20(11) 2280 Dicke, 17(9) 1617, 18(1) 17, 18(2) 289, 18(10) 1966, 19(2) 442, 19(6) 1423, 20(1) 23, 20(7) 1494, 20(9) 1908, 20(11) 2280 www.math.utah.edu /ftp/pub/tex/bib/idx/jmathphys1975/19/5/987-990.html

Neutron Star Grand Challenge, Final Report ``Dynamical Evolution of Boson Stars in Brans-Dicke Theory", Jayashree Balakrishna and Hisa-aki Shinkai, Phys. Unlike linear theory, the convergence of a non-linear problem depends on which solution we are looking at, and at what spacetime point. General Relativistic Astrophysics--astrophysics that involves strong and dynamical gravitational fields requiring the Einstein theory of relativity for its understanding--is becoming an exciting area of research, due to the large amount of data in high energy astronomy, and to the great promise of gravitational wave astronomy. wugrav.wustl.edu /Relativ/nsgc.html

Directory of open access journals The gravitational field of a stationary circular cosmic string loop, externally supported against collapse, is investigated in the context of Brans-Dicke theory in the weak field approximation of the field equations. The solution is quasi-conformally related to the corresponding solution in Einstein's General Relativity(GR) and goes over to the corresponding solution in GR when the Brans-Dicke parameter omega becomes infinitely large. www.doaj.org /abstract?id=36011&toc=y

Astron. Astrophys. 325, 893-897 (1997) = 1, the original Brans-Dicke theory is obtained. The basic equations of the Brans-Dicke theory with a This is an extension of the original form given by Brans and Dicke (1961). aa.springer.de /papers/7325003/2300893/sc2.htm

Bubbles in Brans-Dicke theory Using the thin-wall approximation the authors develop a scheme to describe the evolution of true vacuum bubbles in Jordan-Brans-Dicke theory. The type of bubbles and the time of nucleation determines whether the bubbles recollapse or grow and ultimately expand with the speed of light, which in turn depends on the particle theory and the nucleation process. The big bubbles problem of extended inflation is solved in the case where bubbles recollapse or where the nucleation radius is comparable to the horizon size. stacks.iop.org /0264-9381/10/1507

Bianchi V inflation in the Brans-Dicke theory? Some exact solutions in the Brans-Dicke (BD) theory are shown for a Bianchi V metric having the properties of inflationary expansion, graceful exit and asymptotic evolution to a Friedmann-Robertson-Walker open model. However, the horizon and flatness problems cannot be solved within the standard BD theory because the inflationary period is severely restricted by the value of the BD parameter It is remarkable that inflationary behaviour can occur, even without a cosmological potential or constant. stacks.iop.org /0264-9381/16/3903

Gravitational Astrophysics Group O'Neill's dissertation topic involved a systematic investigation of the Hamiltonian structure of collisionless matter in the context of general relativity and two alternative theories of gravity, namely the Brans-Dicke theory and Kibble's tetrad theory. A paper on the Brans-Dicke theory was recently submitted to Physics Review D. Christos V. Siopis received his Ph. He is also a member of the Institute for Fundamental Theory at the University of Florida, an interdisciplinary program which includes Professors and Postdoctoral Fellows from the Departments of Astronomy, Mathematics, and Physics. www.astro.ufl.edu /%7Egalaxy/group

Mach's principle - Art History Online Reference and Guide There have been attempts to formulate a theory which is more fully Machian, such as Brans-Dicke theory, but none have been completely successful. According to Mach's principle, which is an example of a relational theory, a single object (for example, the Earth) in an otherwise empty Universe would feel no inertial forces. Mach's principle was never developed into a quantitative physical theory that would explain a mechanism by which the stars can have such an effect. www.arthistoryclub.com /art_history/Mach%27s_principle

Citebase - Bound monopoles in Brans-Dicke theory We consider axially symmetric SU(2) Yang-Mills-Higgs (YMH) multimonopoles in Brans-Dicke theory for winding number n > 1. We study gravitating monopoles and non-abelian black holes of SU(2) Einstein-Yang-Mills-Higgs theory coupled to a massless dilaton. We construct monopole solutions in SU(2) Einstein-Yang-Mills-Higgs theory, carrying magnetic charge n. citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:hep-th/0206252

Directory of open access journals To be specific, we construct a cosmological model with varying G, using the Brans-Dicke theory. We compute the primordial abundance of helium as function of the gravitational coupling, using a semi-analytical method, in order to track the influence of G in the primordial nucleosynthesis. www.doaj.org /abstract?id=36018&toc=y

IngentaConnect Quantum violation of the equivalence principle in Brans - Dicke t... We show that quantum fluctuations should violate the weak equivalence principle in the Brans - Dicke theory, which implies that the Jordan frame can no longer be interpreted as physical. Quantum violation of the equivalence principle in Brans - Dicke theory In the Pauli frame the violation of the equivalence principle could be attributed to the existence of the dilatonic fifth force. api.ingentaconnect.com /content/iop/cqg/1997/00000014/00000010/art00022

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