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Topic: Nonsymmetric Gravitational Theory

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Modified Newtonian dynamics

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	Dark matter - Wikipedia, the free encyclopedia
		Another important tool for future dark matter observations is gravitational lensing, in particular a technique called weak lensing that allows astrophysicists to characterize the distribution of dark matter by statistical means.
		However, constructing a relativistic MOND theory has been troublesome, and it is not clear how the theory can be reconciled with gravitational lensing measurements of the deflection of light around galaxies.
		The leading relativistic MOND theory, proposed by Milgrom's colleague Professor Bekenstein in 2004 is called "TeVeS" for Tensor-Vector-Scalar and solves many of the problems of earlier attempts.
	en.wikipedia.org /wiki/Dark_matter (2117 words)

	Re: A critique of Moffat's nonsymmetric gravitational theory?
		Re: A critique of Moffat's nonsymmetric gravitational theory?
		We show that under the assumption of this nonminimal coupling, spacetime is birefringent in the presence of such a gravitational field.
		Moffat's theory is parameterised by a parameter $k$, which has dimensions of length.
	www.lns.cornell.edu /spr/2004-06/msg0061635.html (385 words)

	[No title]
		The field equations of the non-symmetric gravitational theory are derived by considering the presence of electromagnetic magnetic field by adopting a non-minimal coupling, which ensures the validity of equivalance principle.
		Soon after establishing the NGT, Moffat studied the field produced by an electric charge [2] adopting a minimal coupling of the electromagnetic field to gravitation.
		In this paper we have studied the field of a charge particle in a non-symmetric gravitational theory, by using the Lagrangian given by Mann et al[4] and Ragusa [5].
	www.physics.uc.edu /~jarrell/COURSES/ELECTRODYNAMICS/Student_Projects/saydur/saydur.tex (852 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		We start making the observation, that the gravitational field $ g_{\mu\nu}$ and the nonsymmetric gauge field $ A_{\mu\nu}$ arising in the low energy limit in the string theory are exactly the same two basic fields used in four dimensions in nonsymmetric gravity.
		We argue, that this connection between nonsymmetric gravity and string theory at the level of the gauge fields $ g_{\mu\nu}$ and $ A_{\mu\nu}$ is not, however, reflected at the level of the corresponding associated actions.
		In an effort to find a connection between such an actions we discover a new gravitational action, which suggests an alternative version of the bosonic string in which the target and the world-volume metrics are unified.
	www.thphys.uni-heidelberg.de /cgi-bin/abstracts/hep-th:9610160 (168 words)

	Citebase - Nonsymmetric Gravitational Theory as a String Theory (Site not responding. Last check: 2007-10-21)
		It is shown that the new version of nonsymmetric gravitational theory (NGT) corresponds in the linear approximation to linear Einstein gravity theory and antisymmetric field equations with a non-conserved string source current.
		We impose in the nonsymmetric gravitational theory, by means of Lagrange multiplier fields in the action, a set of covariant constraints on the antisymmetric tensor field.
		The massive nonsymmetric gravitational theory is shown to posses a linearisation instability at purely GR field configurations, disallowing the use of the linear approximation in these situations.
	citebase.eprints.org /cgi-bin/citations?id=oai%3AarXiv%2Eorg%3Ahep%2Dth%2F9512018 (686 words)

	A gravitationally powered oscillatory pulsar model
		Until the gravitational and electrical fields are unified it is doubtful that a satisfactory theoretical basis exists for explaining the pulsars.
		It is the conventional conclusion that the antisymmetric terms do not occur in nature, but there is the consideration that the general theory is not a theory of electricity.
		The existing nonsymmetric gravitational theories are not well enough developed that they can be used to obtain a persuasive pulsar solution, while without observational evidence that the pulsars are oscillators there is no compelling need to develop them.
	www.s-4.com /pulsar (1270 words)

	Citebase - Nonsymmetric Gravitational Theory (Site not responding. Last check: 2007-10-21)
		Einstein used the nonsymmetric field structure to derive a unified field theory of gravitation and electromagnetism.
		We use the nonsymmetric field structure to descibe a non-Riemannian theory of gravitation.
		In the weak field approximation, the nonsymmetric gravitational theory has, in addition to the Newtonian gravitational potential, a Yukawa potential produced by the exchange of a spin $1^+$ boson between fermions.
	citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:gr-qc/9411006 (1096 words)

	Citebase - On Gravitational Collapse in the Nonsymmetric Gravitational Theory (Site not responding. Last check: 2007-10-21)
		Assuming that the exterior solution in gravitational collapse is a small, time dependent perturbation of the static solution for a non-zero, generic NGT source ($s\not=0$) and mass density, it is shown that the matching of the interior and exterior solutions will not lead to fl hole event horizons.
		We establish the formalism in the nonsymmetric gravitational theory (NGT) for stellar equilibrium and gravitational collapse.
		The time-dependent, spherically symmetric, Wyman sector of the Unified Field Theory is shown to be equivalent to a self-gravitating scalar field with a positive-definite, repulsive self-interaction potential.
	citebase.eprints.org /cgi-bin/citations?id=oai%3AarXiv%2Eorg%3Aastro%2Dph%2F9510068 (931 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		The dynamics of a class of nonsymmetric gravitational theories are presented in Hamiltonian form.
		The derivation begins with the first-order action, treating the generalized connection coefficients as the canonical coordinates and the densitized components of the inverse of the fundamental tensor as conjugate momenta.
		The phase space of the symmetric sector is enlarged over that of conventional treatments of general relativity by a canonical pair that represents the metric density and its conjugate, removable by imposing strongly an associated pair of second-class constraints and introducing Dirac brackets.
	dx.doi.org /10.1142/S0217751X97001420 (149 words)

	Citebase - Modified Gravitational Theory and Galaxy Rotation Curves
		The nonsymmetric gravitational theory predicts an acceleration law that modifies the Newtonian law of attraction between particles.
		The equations of motion for test particles reduce for weak gravitational fields to the GR equations of motion and the predictions for the solar system and the binary pulsar PSR 1913+16 agree with the observations.
		A covariant scalar-tensor-vector gravity theory is developed which allows the gravitational constant $G$, a vector field coupling $\omega$ and the vector field mass $\mu$ to vary with space and time.
	citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:gr-qc/0404076 (1036 words)

	Astrology Dictionary (Site not responding. Last check: 2007-10-21)
		Many astrologers do not believe that gravitational or tidal forces are the mechanism behind astrology supposedly working, but, the idea that tidal forces affect biological organisms in some way has some scientific support.
		Astrology does not offer any testable explanation of how gravitational pull comes to affect personality, why we are especially susceptible to gravitation during birth nor how the gravitational influences at one point in the past affects our outlook for the future.
		If direction and strength of the gravitational field is important, then surely nearby massive objects (cars, mountains, houses) and the birthing position would play a far greater role than distant planets.
	www.astrology.dictionaries.ro /index.php?title=Dark_matter (3833 words)

	A critique of Moffat's nonsymmetric gravitational theory? - Information Technology Services (Site not responding. Last check: 2007-10-21)
		Melroy - A critique of Moffat's nonsymmetric gravitational theory?
		puppet_sock@hotmail.com - A critique of Moffat's nonsymmetric gravitational theory?
		The theory has had a few different forms.\nBut basically, its got an issue that is both a source of annoyance\nand a source of resilliance.
	www.physicsforums.com /archive/t-29634 (2012 words)

	Field theory: Why have some physicists abandoned it? -- Jackiw 95 (22): 12776 -- Proceedings of the National Academy of ...
		But these shortcomings are actually symptoms of a deeper lack of understanding that has to do with symmetry and symmetry breaking.
		theory models are notoriously difficult to solve and also explicit
		field theory is due to a failure of imagination or whether indeed
	www.pnas.org /cgi/content/full/95/22/12776 (1703 words)

	Heisenberg Durr Schroedinger Bohm
		The rejection of spin-zero theories of gravitation is made on the basis of the gravitational behavior of binding energies.
		A theory of Schroedinger is described in a 29 January 1947 AP newspaper article in part as follows:
		As noted by Rey, and by Horowitz and Susskind, that theory may have a 27-dimensional M-theory, related to the 27-dimensional Jordan algebra J3(O) and its 26-dimensional traceless subalgebra J3(O)o.
	www.tony5m17h.net /HeisHist.html (3256 words)

	A Nonsymmetric Metric
		The behavior of light rays in the Schwarzschild gravitational solution can be represented by a refractive index model [4].
		The solution is only valid from the perspective of a distant observer, which corresponds to the perspective of a potential theory.
		The primary objective of these calculations is to provide some justification for the perspective, then to proceed on to the nonlinear terms.
	www.s-4.com /tensor (536 words)

	A critique of Moffat's nonsymmetric gravitational theory?
		This means that it is fairly hard to predict stuff, but also fairly hard to kill off the theory.
		(This is similar to the situation for like Brans-mode theory with $\omega$ very large.) Since Moffat's theory's experimental/observational predictions can be made arbitrarily close to those of GR by making $k$ sufficently small, Moffat's theory can never be disproved by observations consistent with general relativity.
		The interesting thing which he mentioned in this paper is that his theory can explain both flat rotation curves of spiral galaxies as well as acceleration of the universe (thus avoiding the need for dark matter and dark energy).
	www.science-one.com /new-3483811-4259.html (1266 words)

	Citebase - Gravitational Theory, Galaxy Rotation Curves and Cosmology without Dark Matter (Site not responding. Last check: 2007-10-21)
		The fits assume that the galaxies are not dominated by exotic dark matter and that the effective gravitational constant G runs with distance scale.
		We show that the longitudinal magnetic mode of the nonsymmetric metric tensor theory of gravitation develops a nearly scale invariant spectrum on subhubble scales, and hence may be of relevance for cosmological observations.
		Assuming that Quantum Einstein Gravity (QEG) is the correct theory of gravity on all length scales we use analytical results from nonperturbative renormalization group (RG) equations as well as experimental input in order to characterize the special RG trajectory of QEG which is realized in Nature...
	citebase.eprints.org /cgi-bin/citations?id=oai%3AarXiv%2Eorg%3Aastro%2Dph%2F0412195 (1330 words)

	References > M (Site not responding. Last check: 2007-10-21)
		"The postulates of gravitational thermodynamics" gq/9609048, PRD [>gr-therm].
		"Quantization of gauge theories" APA Suppl XXIII (1981) 491 [>gt-qm].
		"Gravitational instantons and quantization of the cosmological constant" PLB 283 (1992) 52-4 [>inst].
	www.phy.olemiss.edu /~luca/Refs/m.html (11181 words)

	Re: A critique of Moffat's nonsymmetric gravitational theory?
		They usually called it NGT for non-symmetric gravity theory.
		But basically, its got an issue that is both a source of annoyance and a source of resilliance.
		So there's NGT solar system, NGT star formation and gravitational collapse, NGT cosmology, NGT gravity waves, and so on.
	www.lns.cornell.edu /spr/2004-06/msg0061689.html (841 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		Expanded discussion of Seiberg-Witten map included Report-no: TUHEP-TH-03145 Journal-ref: Eur.Phys.J. In the nonsymmetric gravitational theory (NGT) the space-time metric $g_{\mu\nu}$ departs from the flat-space Minkowski form $\eta_{\mu\nu}$ such that it is no longer symmetric, $i.e.$ $g_{\mu\nu} \ne g_{\nu\mu}$.
		This can be expected from the Seiberg-Witten map which has recently been interpreted as equating gauge theories on noncommutative spacetimes with those in a field dependent gravitational background.
		In particular, in scattering processes such as the pair annihilation $e^+e^- \to \gamma\gamma$, both theories make the same striking prediction that the azimuthal cross section oscillates in $\phi$.
	www.thphys.uni-heidelberg.de /cgi-bin/abstracts/hep-ph:0312230 (206 words)

	Untitled
		However, the theoretical possibility that scalar couplings be naturally driven toward zero by the cosmological expansion suggests that the present agreement between Einstein's theory and experiment might be compatible with the existence of a long-range scalar contribution to gravity (such as the dilation field, or a moduli field, of string theory).
		Abstract: Gauge field theories may quite generally be defined as describing the coupling of a matter-field to an interaction-field, and they are suitably represented in the mathematical framework of fiber bundles.
		Abstract: The mass of bodies with appreciable gravitational self-energy vary in time at a rate proportional to any time variation of the gravitational coupling parameter G. As a result of these mass variations, gravitationally compact bodies will experience anomalous accelerations proportional to their motion relative to the cosmological rest frame in which G = G(t).
	cfa-www.harvard.edu /poem/docs/Literature/papers.htm (14060 words)

	Nonsymmetric Gravitational Theory (NGT) - Information Technology Services (Site not responding. Last check: 2007-10-21)
		Nonsymmetric Gravitational Theory (NGT) - Information Technology Services
		Moffat has been developing NGT for about 25 years as a modification of General Relativity.
		He is able to explain away dark matter and dark energy with his theory (astro-ph/0403266 on archXiv is his most recent paper, see also gr-qc/9411006).
	www.physicsforums.com /archive/t-43577_Nonsymmetric_Gravitational_Theory_(NGT).html (64 words)

	new articles (Site not responding. Last check: 2007-10-21)
		Baki P., Malo J.O. Gauchy Analysis of the Linearized Skew Sector of the Massive Nonsymmetric Gravitational Theory.
		Jona-Lasinio G., Marchetti F.M. On the Pairing Structure of the Vacuum Induced by a Magnetic Field in 2+1-dimensional Dirac Field Theory.
		Zhao W-Z. Gauge Theory of the Diffeomorphism Subgroup of the Torus Membrane.
	lib.jinr.ru /arch99/sw4243.html (3347 words)

	Nonsymmetric Gravitational Theory as a String Theory (ResearchIndex) (Site not responding. Last check: 2007-10-21)
		Abstract: It is shown that the new version of nonsymmetric gravitational theory (NGT) corresponds in the linear approximation to linear Einstein gravity theory and antisymmetric tensor potential field equations with a non-conserved string source current.
		The Hamiltonian for the antisymmetric field equations is bounded from below and describes the exchange of a spin 1 + massive vector boson between open strings.
		The non-Riemannian geometrical theory is formulated in terms of a nonsymmetric fundamental...
	citeseer.ist.psu.edu /178250.html (302 words)

	APPM Preprints
		On Symmetric and Nonsymmetric Blow-up for a Weakly Quasilinear Heat Equation, Bebernes, J. W., Bressan, A. and Galaktionov, V. October 1994.
		Multiresolution quantum chemistry: basic theory and initial applications, Harrison, R., Fann, G., Yanai, T., Gan, Z. and Beylkin, G., December 1, 2003.
		Theory of Magnetodynamics Induced by Spin Torque in Perpendicularly Magnetized Thin Films, Hoefer, M. A., Ablowitz, M. J., Ilan, B., Pufall, M. and Silva, T. June 30, 2005.
	amath.colorado.edu /activities/preprints (8918 words)

	Nonsymmetric Gravitational Theory Definition / Nonsymmetric Gravitational Theory Research (Site not responding. Last check: 2007-10-21)
		Nonsymmetric Gravitational Theory Definition / Nonsymmetric Gravitational Theory Research
		Nonsymmetric Gravitational Theory is a modification of Einstein's theory of General Relativity that tries to explain the mystery of Dark Matter.
		The theory is similar to Modified Newtonian Dynamics (MOND) in suggesting that there is no Dark Matter.
	www.elresearch.com /Nonsymmetric_Gravitational_Theory (99 words)

	► » A critique of Moffat's nonsymmetric gravitational theory? (Site not responding. Last check: 2007-10-21)
		► » A critique of Moffat's nonsymmetric gravitational theory?
		Subject: A critique of Moffat's nonsymmetric gravitational theory?
		Moffat's theory is parameterised by a parameter $k$, which has dimensions
	www.science-one.org /A-critique-of-Moffats-nonsymmetric-gravitational-theory-3483811.html (938 words)

	References > J
		"Introduction to the Yang-Mills quantum theory" RMP 52 (1980) 661-73 [>gt-quant].
		w J Kijowski "On theories of gravitation with nonlinear Lagrangians" PRD 37 (1988) 1406-9 [>grav; *].
		w J Kijowski "On theories of gravitation with nonsymmetric connection" JMP 30 (1989) 1077-80 [>grav].
	www.phy.olemiss.edu /~luca/Refs/j.html (2497 words)

	Martian Spiders
		Re: 'Coronal Heating' Could Be Explained by Solar Gravitation
		The best theory about the Martian-spider ravines (Kieffer's theory) is that they were etched into the surface by pressurized gas rushing to escape holes in the CO2 icecap during seasonal icecap evaporations.
		While frozen water melts into liquid, CO2 ice vaporizes into gas that builds under the icecap as it evaporates during its annual recession.
	www.science-one.com /new-3483931-4259.html (452 words)

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