نتایج جستجو برای: quasi einstein
تعداد نتایج: 109570 فیلتر نتایج به سال:
Starting with a Gaussian variational ansatz, we predict anisotropic bright solitons in quasi-2D Bose-Einstein condensates consisting of atoms with dipole moments polarized perpendicular to the confinement direction. Unlike isotropic solitons predicted for the moments aligned with the confinement axis [Phys. Rev. Lett. 95, 200404 (2005)10.1103/PhysRevLett.95.200404], no sign reversal of the dipo...
We develop a framework for understanding the existence of asymptotically flat solutions to the static vacuum Einstein equations on M = R \ B with geometric boundary conditions on ∂M ' S. A partial existence result is obtained, giving a partial resolution of a conjecture of Bartnik on such static vacuum extensions. The existence and uniqueness of such extensions is closely related to Bartnik’s d...
We examine an effectively attractive quasi-one-dimensional Bose-Einstein condensate of atoms confined in a rotating toroidal trap, as the magnitude of the coupling constant and the rotational frequency are varied. Using both a variational mean-field approach, as well as a diagonalization technique, we identify the phase diagram between a uniform and a localized state and we describe the system ...
The weakly coupled quasi-one-dimensional spin ladder compound (CH3)2CHNH3CuCl3 is studied by neutron scattering in magnetic fields exceeding the critical field of Bose-Einstein condensation of magnons. Commensurate long-range order and the associated Goldstone mode are detected and found to be similar to those in reference to spin-dimer materials. However, for the upper two massive magnon branc...
We present a countably infinite number of new explicit co-homogeneity one Sasaki–Einstein metrics on S × S, in both the quasi-regular and irregular classes. These give rise to new solutions of type IIB supergravity which are expected to be dual to N = 1 superconformal field theories in four dimensions with compact or non-compact R-symmetry and rational or irrational central charges, respectivel...
We describe a shielding mechanism for charged black hole immersed in background involving matter fields, solely arising from the Einstein-Maxwell field equations. In particular, we consider generalization of Einstein cluster, that is surrounded by an effective fluid model partially dust cloud. show mechanism, thereof, generic and appears different parametrization problem as well. this process, ...
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