Results 101 to 110 of about 674,523 (227)

Tetrakis(1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidin-9-ido-κ2N1,N9)niobium(V) hexafluoridophosphate

Acta Crystallographica Section E, 2008
The title complex, [Nb(C7H12N3)4]PF6, features chelating hpp anions (hpp is 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine) that define a distorted dodecahedral coordination geometry based on an N8 donor set.
Edward R. T. Tiekink, Nattamai Bhuvanesh, Pavel V. Poplaukhin, Carlos A. Murillo, F. Albert Cotton   +4 more
doaj   +1 more source

On hidden symmetries of extremal Kerr-NUT-AdS-dS black holes

, 2010
It is well known that the Kerr-NUT-AdS-dS black hole admits two linearly independent Killing vectors and possesses a hidden symmetry generated by a rank-2 Killing tensor.
Bardeen, Cariglia, Carter, Carter, Castro, Chen, Chen, Emparan, Frolov, Galajinsky, Ghezelbash, Griffiths, Guica, Jørgen Rasmussen, Kashiwada, Kubizňák, Kubizňák, Rasmussen, Tachibana, Walker, Yano   +20 more
core   +1 more source

Weyl Geometry as Characterization of Space-Time

, 2011
Motivated by an axiomatic approach to characterize space-time it is investigated a reformulation of Einstein's gravity where the pseudo-riemannian geometry is substituted by a Weyl one.
Adler R., Salim J. M., Salim J. M., Weyl H.   +3 more
core   +1 more source

Symmetry in toric geometry

, 2020
Families of algebraic varieties that are parametrized by monomials appear in various areas of mathematics, such as statistics, commutative algebra and combinatorics. Such varieties are referred to as toric varieties and they are the structural objects of toric geometry. The ideals defining toric varieties are prime binomial ideals.
openaire   +2 more sources

Gauge symmetry, T-duality and doubled geometry

Journal of High Energy Physics, 2008
String compactifications with T-duality twists are revisited and the gauge algebra of the dimensionally reduced theories calculated. These reductions can be viewed as string theory on T-fold backgrounds, and can be formulated in a `doubled space' in which each circle is supplemented by a T-dual circle to construct a geometry which is a doubled torus ...
Hull, C. M., Reid-Edwards, R. A.
openaire   +2 more sources

The General Linear Cartan Khronon

Universe, 2019
A Cartan geometry of the General Linear symmetry is formulated by dividing out the displacements from the group. The resulting action is quadratic in curvature, polynomial in all the (minimal) variables, and describes an observer space that—in the ...
Tomi Koivisto, Manuel Hohmann, Tom Złośnik   +2 more
doaj   +1 more source

Lie point symmetries of near-horizon geometry equation [PDF]

, 2020
E. Buk, Jerzy Lewandowski, Adam Szereszewski   +2 more
openalex   +1 more source

Symmetry breaking and the geometry of reduced density matrices

New Journal of Physics, 2016
The concept of symmetry breaking and the emergence of corresponding local order parameters constitute the pillars of modern day many body physics. We demonstrate that the existence of symmetry breaking is a consequence of the geometric structure of the ...
V Zauner, D Draxler, L Vanderstraeten, J Haegeman, F Verstraete   +4 more
doaj   +1 more source

Bis(1,10-phenanthroline-κ2N,N′)(sulfato-κ2O,O′)zinc(II) propane-1,3-diol solvate

Acta Crystallographica Section E, 2010
In the title compound, [Zn(SO4)(C12H8N2)2]·C3H8O2, the Zn2+ ion (site symmetry 2) is coordinated by two chelating 1,10-phenanthroline ligands and an O,O′-bidentate sulfate ion (S site symmetry 2), resulting in a distorted cis-ZnO2N4 ...
Jiang-Dong Cui, Kai-Long Zhong, Yan-Yun Liu   +2 more
doaj   +1 more source

A-type Ce2NCl3

Acta Crystallographica Section E, 2011
Cerium(III) nitride chloride, Ce2NCl3, contains trans-edge connected [NCe4]9+ tetrahedra (222 symmetry) forming chains parallel to the c axis that are separated by Cl− anions.
Christian M. Schurz, Thomas Schleid
doaj   +1 more source