Results 41 to 50 of about 2,302,822 (346)

Gravitating $\sigma$ Model Solitons

, 1998
We study axially symmetric static solitons of O(3) nonlinear $\sigma$ model coupled to (2+1)-dimensional anti-de Sitter gravity. The obtained solutions are not self-dual under static metric. The usual regular topological lump solution cannot form a black
A. A. Belavin, A. Achucarro, A. Comtet, A. G. Cohen, A. Staruszkiewicz, A. Vilenkin, A. Vilenkin, B. Linet, C. Kim, D. Garfinkle, D. Harari, E. Witten, F. A. Bais, G. Clement, G. Clement, G. Clément, G. T. Horowitz, G. W. Gibbons, G. W. Gibbons, I. Ichinose, J. D. Brown, J. D. Brown, J. Gott, J. R. Gott III, J. S. F. Chan, K. Arthur, K. C. K. Chan, K. C. K. Chan, K. Ghoroku, K. Kimm, K. Lee, K. Lee, K. Maeda, K. S. Thorne, M. B. Hindmarsh, M. Bañados, M. Bañados, M. E. Ortiz, M. E. Ortiz, M. Natsuume, N. Kaloper, N. Kim, N. Kim, P. Breitenlohner, P. C. Aichelburg, P. Laguna, R. A. Leese, R. Bartnik, R. Gregory, R. L. Davis, S. Carlip, S. Carlip, S. Deser, S. Deser, S. Giddings, S. Hyun, Sei-Hoon Moon, T. Tachizawa, W. Hiscock, Y. Kim, Y. M. Cho, Y. Yang, Yoonbai Kim   +62 more
core   +1 more source

Sigma-model symmetry in orientifold models [PDF]

Journal of High Energy Physics, 2000
We investigate in the simplest compact D=4 N=1 Type IIB orientifold models the sigma-model symmetry suggested by the proposed duality of these models to heterotic orbifold vacua. This symmetry is known to be present at the classical level, and is associated to a composite connection involving untwisted moduli in the low-energy supergravity theory.
Scrucca CA, Serone, Marco
openaire   +6 more sources

Integrable sigma model with generalized F structure, Yang-Baxter sigma model with generalized complex structure and multi-Yang-Baxter sigma model

Nuclear Physics B
We construct an integrable sigma model with a generalized F structure, which involves a generalized Nijenhuis structure J satisfying J3=−J. Utilizing the expression of the generalized complex structure on the metric Lie group manifold G in terms of ...
A. Rezaei-Aghdam, A. Taghavi
doaj   +1 more source

Constraints on inflation revisited: an analysis including the latest local measurement of the Hubble constant

European Physical Journal C: Particles and Fields, 2017
We revisit the constraints on inflation models by using the current cosmological observations involving the latest local measurement of the Hubble constant ( $$H_{0} = 73.00\pm 1.75$$ H 0 = 73.00 ± 1.75  km s $$^{-1}$$ - 1  Mpc $$^{-1}$$ - 1 ).
Rui-Yun Guo, Xin Zhang
doaj   +1 more source

Equilibrium density matrices for the 2D black hole sigma models from an integrable spin chain

Journal of High Energy Physics, 2021
This work concerns the quantum Lorentzian and Euclidean black hole non-linear sigma models. For the Euclidean black hole sigma model an equilibrium density matrix is proposed, which reproduces the modular invariant partition function from the 2001 paper ...
Vladimir V. Bazhanov, Gleb A. Kotousov, Sergei L. Lukyanov   +2 more
doaj   +1 more source

Combined constraints on modified Chaplygin gas model from cosmological observed data: Markov Chain Monte Carlo approach

, 2011
We use the Markov Chain Monte Carlo method to investigate a global constraints on the modified Chaplygin gas (MCG) model as the unification of dark matter and dark energy from the latest observational data: the Union2 dataset of type supernovae Ia (SNIa),
A. Dev, A.C. Pope, A.C.C. Guimaraes, A.G. Riess, A.Y. Kamenshchik, B. Feng, B. Ratra, D. Rapetti, D.J. Eisenstein, D.J. Eisenstein, D.J. Eisenstein, D.N. Spergel, E. Di Pietro, F.C. Santos, H. Spinrad, J. Dunlop, J. Simon, J. Simon, J.B. Lu, J.B. Lu, J.B. Lu, J.B. Lu, J.D. Barrow, J.R. Bond, Jianbo Lu, L. Amendola, L. Perivolaropoulos, L. Samushia, L.A. Nolan, L.X. Xu, Lixin Xu, M. Bouhmadi-Lopez, M. Hicken, M. Li, M. Makler, M. Makler, M. Szydlowski, M.C. Bento, M.C. Bento, M.L. Bedran, Molin Liu, P.T. Silva, P.X. Wu, R. Bean, R. Jimenez, R. Jimenez, R. Jimenez, R.G. Abraham, R.G. Abraham, R.R. Caldwell, S. Li, S. Nesseris, S. Nesseris, S. Nesseris, S. Nesseris, S. Perlmutter, S. Weinberg, S.W. Allen, T. Barreiro, T. Treu, T. Treu, T. Treu, U. Alam, U. Alam, U. Debnath, W. Hu, W. Hu, W. Hu, W.J. Percival, Y.G. Gong, Y.G. Gong, Y.T. Wang, Yabo Wu, Z.H. Zhu, Z.L. Yi, Z.X. Zhai   +75 more
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Grassmannian heterotic sigma model [PDF]

Physical Review D, 2019
21 pages, 6 ...
Kreshchuk, Michael, Kurianovych, Evgeniy, Shifman, Mikhail   +2 more
openaire   +2 more sources

Boundary conditions and the generalized metric formulation of the double sigma model

Nuclear Physics B, 2015
Double sigma model with strong constraints is equivalent to the ordinary sigma model by imposing a self-duality relation. The gauge symmetries are the diffeomorphism and one-form gauge transformation with the strong constraints.
Chen-Te Ma
doaj   +1 more source

Casimir amplitudes in a quantum spherical model with long-range interaction

, 2000
A $d$-dimensional quantum model system confined to a general hypercubical geometry with linear spatial size $L$ and ``temporal size'' $1/T $ ($T$ - temperature of the system) is considered in the spherical approximation under periodic boundary conditions.
Chamati, H., Danchev, D. M., Tonchev, N. S.   +2 more
core   +1 more source

Twistor spaces for HKT manifolds [PDF]

, 1996
We construct the twistor space associated with an HKT manifold, that is, a hyper-K\"ahler manifold with torsion, a type of geometry that arises as the target space geometry in two-dimensional sigma models with (4,0) supersymmetry.
Bonneau, Callan, Delduc, Delduc, G. Papadopoulos, Gates, Gibbons, Gibbons, Hitchin, Howe, Howe, Howe, Howe, Howe, Howe, Hull, Ivanov, Ivanov, P.S. Howe, Papadopoulos, Rossly, Salamon, Salamon, Sen, Spindel, Spindel, Tseytlin   +26 more
core   +2 more sources