Results 31 to 40 of about 18,006 (157)

On 4-Manifolds, Folds and Cusps

, 2012
We study simple wrinkled fibrations, a variation of the simplified purely wrinkled fibrations introduced by Williams, and their combinatorial description in terms of surface diagrams.
Behrens, Stefan
core   +1 more source

Singular unitary representations and indefinite harmonic theory

Journal of Functional Analysis, 1983
AbstractSquare-integrable harmonic spaces are defined and studied in a homogeneous indefinite metric setting. In the process, Dolbeault cohomologies are unitarized, and singlar unitary representations are obtained and studied.
Rawnsley, John, Schmid, Wilfried, Wolf, Joseph A   +2 more
openaire   +1 more source

Superstring Theory on pp Waves with ADE Geometries

, 2005
We study the BMN correspondence between certain Penrose limits of type IIB superstrings on pp-wave orbifolds with $ADE$ geometries, and the set of four-dimensional $\mathcal{N}=2$ superconformal field theories constructed as quiver gauge models ...
Abounasr, Raja, Belhaj, Adil, Rasmussen, Jorgen, Saidi, El Hassan   +3 more
core   +1 more source

Thermodynamics of (3+1)-dimensional black holes with toroidal or higher genus horizons [PDF]

, 1997
We examine counterparts of the Reissner-Nordstrom-anti-de Sitter black hole spacetimes in which the two-sphere has been replaced by a surface Sigma of constant negative or zero curvature.
A. Ashtekar, A. Ashtekar, A. Chamblin, B. Bertotti, B. Carter, B. Carter, B. F. Whiting, B. F. Whiting, C. A. Allendoerfer, C. G. Huang, C. W. Misner, D. Kramer, D. N. Page, D. R. Brill, D. R. Brill, D. R. Brill, Dieter R. Brill, G. Galloway, H. Nariai, H. W. Braden, I. Robinson, J. A. Wolf, J. D. Brown, J. D. Brown, J. D. Brown, J. L. Friedman, J. Louko, J. Louko, J. Louko, J. Louko, J. P. S. Lemos, J. P. S. Lemos, J. P. S. Lemos, J. W. York, Jorma Louko, K. A. Bronnikov, K. Lake, L. E. Reichl, L. F. Abbott, M. Bañados, M. Bañados, M. Henneaux, M. Spivak, M. Walker, P. C. W. Davies, P. C. W. Davies, P. T. Chrusciel, Peter Peldán, R. B. Mann, R. M. Wald, R.-G. Cai, S. Bose, S. Carlip, S. Nag, S. W. Hawking, S. W. Hawking, S. Åminneborg, T. Jacobson, T. Levi-Civita   +58 more
core   +2 more sources

Periodic Solutions of a Singular Equation With Indefinite Weight

Advanced Nonlinear Studies, 2010
AbstractMotivated by some relevant physical applications, we study the existence and uniqueness of T-periodic solutions for a second order differential equation with a piecewise constant singularity which changes sign. Other questions like the stability and robustness of the periodic solution are considered.
Bravo, José Luis, Torres, Pedro J.
openaire   +2 more sources

Modification rule of monodromies in R_2-move

, 2012
An R_2-move is a homotopy of wrinkled fibrations which deforms images of indefinite fold singularities like Reidemeister move of type II. Variants of this move are contained in several important deformations of wrinkled fibrations, flip and slip for ...
Akbulut, Donaldson, Earle, Earle, Fadell, Farb, Gompf, Kenta Hayano   +7 more
core   +1 more source

Singular Sturm?Liouville problems with nonnegative and indefinite weights

Monatshefte f�r Mathematik, 1984
This article is concerned with the oscillatory properties of the eigenfunctions of a class of singular Sturm-Liouville problems \(- (py')'+qy=\lambda wy\) on (a,b), where the weight function w vanishes on a subinterval of positive measure, or where the weight function w changes sign on (a,b).
Kaper, H.G., Kwong, M.K., Zettl, A.
openaire   +2 more sources

A geometric representation of improper indefinite affine spheres with singularities [PDF]

Journal of Geometry, 2011
Given a pair of planar curves, one can define its generalized area distance, a concept that generalizes the area distance of a single curve. In this paper, we show that the generalized area distance of a pair of planar curves is an improper indefinite affine spheres with singularities, and, reciprocally, every indefinite improper affine sphere in $\R^3$
Craizer, Marcos, Teixeira, Ralph Costa, Silva, Moacyr Alvim Horta Barbosa da   +2 more
openaire   +4 more sources

Indefinite Sturm–Liouville operators with the singular critical point zero [PDF]

Proceedings of the Royal Society of Edinburgh: Section A Mathematics, 2008
We present a new necessary condition for similarity of indefinite Sturm-Liouville operators to self-adjoint operators. This condition is formulated in terms of Weyl-Titchmarsh $m$-functions. Also we obtain necessary conditions for regularity of the critical points 0 and $\infty$ of $J$-nonnegative Sturm-Liouville operators.
Karabash, Illya M., Kostenko, Aleksey S.
openaire   +2 more sources

A Counterexample for Singular Equations with Indefinite Weight

Advanced Nonlinear Studies, 2017
Abstract We construct a second-order equation x ¨ =
openaire   +2 more sources