Non-geometric string backgrounds were proposed to be related to a nonassociative deformation of the space-time geometry. In the flux formulation of double field theory (DFT), the structure of mathematically possible non-associative deformations is analyzed in detail. It is argued that on-shell there should not be any violation of associativity in the effective DFT action. For imposing either th...

We explain in detail how to calculate the gravitational mass and angular momentum multipoles of most general non-extremal four-dimensional black hole with four magnetic electric charges. also these for generic supersymmetric microstate geometries multi-center solutions. Both Kerr holes BPS many vanish. However, if one embeds String Theory slightly deforms them, can an infinite set ratios vanish...

Abstract Pore diameter and arc thickness of propellant are decided by the extrusion mold parameters. Mold needles deform during propellant’s forming process because material’s high viscosity needle’s flexibility, which affects quality products. Based on fluid-structure interaction, we simulated 19-hole nitroguanidine studied influence law structural parameters deformation needles. The results s...

Metric of axially symmetric asymptotically flat black holes in an arbitrary metric theory gravity can be represented the general form which depends on infinite number parameters. We constrain this class metrics by requiring existence additional symmetries, lead to separation variables Hamilton-Jacobi and Klein-Gordon equations, show that once functions change sufficiently moderately some region...

Hole spins in semiconductors are a potential qubit alternative to electron spins. In nuclear-spin-rich host crystals like GaAs, the hyperfine interaction of hole with nuclei is considerably weaker than that for electrons, leading potentially longer coherence times. Here we demonstrate optical pumping and coherent population trapping acceptor-bound holes strained GaAs epitaxial layer. We find $\...

When blasting to enhance permeability in deep-buried soft coal mining face with a hard roof whose gas drainage requirement is higher, the charging hole and control (which doubles as hole) are easy be deformed damaged, seriously affecting implementation effect. Combining stratum characteristics of seam surrounding rock, idea arranging boreholes near rock reduce deformation, inspired by end effec...

We investigate the quantum deformation of Wheeler--DeWitt equation a Schwarzchild black hole. Specifically, deformed hole is quantized model constructed from Heisenberg--Weyl $U_q(h_4)$ group. show that event horizon area and mass are quantized, degenerate, bounded. The degeneracy states indicates entangled hole/white states. Accordingly, provides new framework to examine Einstein--Rosen wormho...

Fuzzy functional dependency (FFD) is a kind of semantic knowledge and can be discovered from a large volume of business data. Sectional FFD and Attribute FFD are discussed so as to reflect semantics of the business world and express useful information that is natural for people to comprehend. The experimental results on an insurance data set show that the proposed method can extract knowledge e...