Results 1 - 10 of 11,619

Macroscopic strings as heavy quarks in large N gauge theory and Anti-de Sitter supergravity

by Soo-jong Rey, Jung-tay Yee - PHYS. J. C22
"... Maldacena has put forward large N correspondence between superconformal field theories on the brane and anti-de Sitter supergravity in spacetime. We study some aspects of the correspondence between N = 4 superconformal gauge theory on D3-brane and maximal supergravity on adS5 × S5 by introducing mac ..."
Abstract - Cited by 508 (1 self) - Add to MetaCart
potential and again find agreements between the gauge theory and the supergravity results. By turning on Ramond-Ramond zero-form potential, we also study θ vacuum angle dependence of the static potential. We finally discuss dynamical realization of loop equation via turning on local electric field

Charting a Manifold

by Matthew Brand, Matthew Brand - Advances in Neural Information Processing Systems 15 , 2003
"... this paper we use m i ( j ) N ( j ; i , s ), with the scale parameter s specifying the expected size of a neighborhood on the manifold in sample space. A reasonable choice is s = r/2, so that 2erf(2) > 99.5% of the density of m i ( j ) is contained in the area around y i where the manifold i ..."
Abstract - Cited by 206 (7 self) - Add to MetaCart
is expected to be locally linear. With uniform p i and i , m i ( j ) and fixed, the MAP estimates of the GMM covariances are S i = m i ( j ) (y j i )(y j i ) # + ( j i )( j i ) # +S j m i ( j ) . (3) Note that each covariance S i is dependent on all other S j . The MAP estimators

P.: A Comprehensive Physical Model for Light Reflection

by Xiao D. He, Kenneth E, Frangois X. Sillion, Donald P. Greenberg - In Proc. of SIGGRAPH , 1991
"... A new general reflectance model for computer graphics is presented. The model is based on physical optics and describes specular, directional diffuse, and uniform diffuse reflection by a surface. The reflected light pattern depends on wavelength, incidence angle, two surface roughness parameters. an ..."
Abstract - Cited by 191 (7 self) - Add to MetaCart
A new general reflectance model for computer graphics is presented. The model is based on physical optics and describes specular, directional diffuse, and uniform diffuse reflection by a surface. The reflected light pattern depends on wavelength, incidence angle, two surface roughness parameters

Vacuum quantum fluctuations in curved space and the theory of gravitation, Sov

by Academician A. D. Sakharov - 1040 [Dokl. Akad. Nauk Ser. Fiz. 177 (1967) 70] [Sov. Phys. Usp. 34 , 1968
"... In Einstein’s theory of gravitation one postulates that the action of space-time depends on the curvature (R is the invariant of the Ricci tensor): ..."
Abstract - Cited by 117 (0 self) - Add to MetaCart
In Einstein’s theory of gravitation one postulates that the action of space-time depends on the curvature (R is the invariant of the Ricci tensor):

Theta vacuum in different gauges

by C. Adam , 1998
"... In some recent papers it is claimed that the physical significance of the vacuum angle theta for QCD-like theories depends on the chosen gauge condition. We criticise the arguments that were given in support of this claim, and show by explicit construction for the case of QED2 that and why they fail ..."
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In some recent papers it is claimed that the physical significance of the vacuum angle theta for QCD-like theories depends on the chosen gauge condition. We criticise the arguments that were given in support of this claim, and show by explicit construction for the case of QED2 that and why

Seasonal and energy dependence of solar neutrino vacuum oscillations

by V. Barger, K. Whisnant , 1999
"... We make a global vacuum neutrino oscillation analysis of solar neutrino data, including the seasonal and energy dependence of the recent Super–Kamiokande 708day results. The best fit parameters for νe oscillations to an active neutrino are δm 2 = 4.42 × 10 −10 eV 2, sin 2 2θ = 0.93. The allowed mixi ..."
Abstract - Cited by 3 (0 self) - Add to MetaCart
We make a global vacuum neutrino oscillation analysis of solar neutrino data, including the seasonal and energy dependence of the recent Super–Kamiokande 708day results. The best fit parameters for νe oscillations to an active neutrino are δm 2 = 4.42 × 10 −10 eV 2, sin 2 2θ = 0.93. The allowed

Classical Solutions in String Field Theory Around the Tachyon Vacuum

by Leonardo Rastelli , Ashoke Sen , Barton Zwiebach , 2001
"... In a previous paper [hep-th/0012251] we proposed a simple class of actions for string field theory around the tachyon vacuum. In this paper we search for classical solutions describing D-branes of different dimensions using the ansatz that the solutions factorize into the direct product of a matter ..."
Abstract - Cited by 110 (5 self) - Add to MetaCart
In a previous paper [hep-th/0012251] we proposed a simple class of actions for string field theory around the tachyon vacuum. In this paper we search for classical solutions describing D-branes of different dimensions using the ansatz that the solutions factorize into the direct product of a matter

Condensates and Vacuum Structure of

by Adjoint Qcd, T. Fugleberg, I. Halperin, A. Zhitnitsky , 1997
"... We discuss a two dimensional SU(N) Yang-Mills theory coupled to massive adjoint fermions for different worlds classified by the integer k = 0,1,...N − 1. We study the fermion condensate for these unconnected worlds as a function of the parameter k. We show that the condensate as well as the spectrum ..."
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as the spectrum of the theory do depend on this vacuum parameter k. Technically, the value of the fermion condensate is related to the value of the gluon condensate via the Operator Product Expansion. We use this to find the leading dependence (in the limit of a heavy quark) of the fermion condensate 〈k | ¯ ψψ

DECOHERENCE FROM VACUUM FLUCTUATIONS

by Markus B Üttiker , 2001
"... Vacuum fluctuations are a source of irreversibility and decoherence. We investigate the persistent current and its fluctuations in a ring with an in-line quantum dot with an Aharonov-Bohm flux through the hole of the ring. The Coulomb blockade leads to persistent current peaks at values of the gate ..."
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with an average persistent current much larger than the (time-dependent) mean squared fluctuations to a state with a small average persistent current and large mean squared fluctuations. We discuss the spectral density of charge fluctuations and discuss diffusion rates for angle variables characterizing

Rotating vacuum wormhole

by unknown authors , 1998
"... We investigate whether self-maintained vacuum traversible wormhole can exist described by stationary but nonstatic metric. We consider metric being the sum of static spherically symmetric one and a small nondiagonal component which describes rotation sufficiently slow to be taken into account in the ..."
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in the linear approximation. We study semiclassical Einstein equations for this metric with vacuum expectation value of stress-energy of physical fields as the source. In suggestion that the static traversible wormhole solution exists we reveal possible azimuthal angle dependence of angular velocity
Results 1 - 10 of 11,619