Probing Smearing Effect by Point-Like Graviton in Plane-Wave Matrix Model

We investigate the interaction between flat membrane and point-like graviton in the plane-wave matrix model. The one-loop effective potential in the large distance limit is computed and is shown to be of r^{-3} type where r is the distance between two objects. This type of interaction has been interpreted as the one incorporating the smearing effect due to the configuration of flat membrane in plane-wave background. Our result supports this interpretation and provides one more evidence about it.Comment: 22 pages, LaTeX2

Conductivity in the anisotropic background

By using the gauge/gravity duality, we investigate the dual field theories of the anisotropic backgrounds, which are exact solutions of Einstein-Maxwell-dilaton theory with a Liouville potential. When we turn on the bulk gauge field fluctuation $A_x$ with a non-trivial dilaton coupling, the AC conductivity of this dual field theory is proportional to the frequency with an exponent depending on parameters of the anisotropic background. In some parameter regions, we find that this conductivity can have the negative exponent like the strange metal. In addition, we also investigate another U(1) gauge field fluctuation, which is not coupled with a dilaton field. We classify all possible conductivities of this system and find that the exponent of the conductivity is always positive.Comment: 22 pages, 13 figures, added some comments and reference

Domain wall cosmology and multiple accelerations

We classify the cosmological behaviors of the domain wall under junctions between two spacetimes in terms of various parameters: cosmological constants of bulk spacetime, a tension of a domain wall, and mass parameters of the black hole-type metric. Especially, we consider the false-true vacuum type junctions and the domain wall connecting between an inner AdS space and an outer AdS Reissner-Nordstr${\rm \ddot{o}}$m black hole. We find that there exist a solution to the junction equations with an inflation at earlier times and an accelerating expansion at later times.Comment: corrected typos, title and sec.

Properties of Holographic Mesons on Dense Medium

We study the energy dispersions of holographic light mesons and their decay constants on dense nuclear medium. As the spatial momenta of mesons along the boundary direction increase, both observables of the mesons not only increase but also split according to the isospin charges. The decay constant of the negative meson is more large than that of the positive meson of the same type due to the chemical potentials of the background nucleons.Comment: 18 pages, 8 Fig. number

Dynamics of false vacuum bubbles with nonminimal coupling

We study the dynamics of false vacuum bubbles. A nonminimally coupled scalar field gives rise to the effect of negative tension. The mass of a false vacuum bubble from outside observer's point of view can be positive, zero, or negative. The interior false vacuum has de Sitter geometry, while the exterior true vacuum background can have geometry depending on the vacuum energy. We show that there exist expanding false vacuum bubbles without the initial singularity in the past.Comment: 17 pages, 13 figure

5,5′-[1,4-Phenyl­enebis(methyl­enesulfanedi­yl)]bis­[1,3,4-thia­diazol-2(3H)-one] dimethyl sulfoxide disolvate

The asymmetric unit of the title compound, C12H10N4O2S4·2C2H6OS, contains one half of the p-xylene mol­ecule and one dimethyl sulfoxide mol­ecule. The p-xylene mol­ecule is located about a crystallographic inversion centre. In the mol­ecule, the thia­diazole and benzene rings are almost perpendicular to one another, with a dihedral angle of 88.95 (6)°. In the crystal, an N—H⋯O hydrogen bond is observed between the two components. The dimethyl sulfoxide mol­ecule is disordered over two orientations with an occupancy ratio of 0.879 (1):0.121 (1)

N-(5-Sulfanyl­idene-4,5-dihydro-1,3,4-thia­diazol-2-yl)acetamide dimethyl sulfoxide disolvate

In the title compound, C4H5N3OS2·2C2H6OS, the five-membered heterocyclic ring and the N—(C=O)—C plane of the acetamide group are essentially co-planar, with a dihedral angle of 1.25 (3)°. Inter­molecular N—H⋯O hydrogen bonds between the acetamide compound and the dimethyl sulfoxide mol­ecules stabilize the crystal structure. The two dimethyl sulfoxide mol­ecules are each disordered over two positions with occupancy ratios of 0.605 (2):0.395 (2) and 0.8629 (18):0.1371 (18)

5-({3-[(5-Amino-1,3,4-thia­diazol-2-yl)sulfanylmeth­yl]benz­yl}sulfan­yl)-1,3,4-thia­diazol-2-amine

In the title compound, C12H12N6S4, the two terminal thia­diazole rings are twisted with respect to the central benzene ring, making dihedral angles of 54.28 (4) and 76.56 (3)°. The dihedral angle between the two thia­diazole rings is 27.77 (4)°. Inter­molecular N—H⋯N hydrogen bonds stabilize the crystal packing, linking the mol­ecules into a tape along the b axis