Intracluster Supernova as a Possible Extra Energy Source of Clusters

The observed luminosity -- temperature relation of clusters is considerably steeper than that expected from a simple scaling relation. Although extra energy input is a likely solution, its source has not been identified. We propose intracluster supernova as a possible source, and also predict the supernova rate in intracluster space as a critical test.Comment: 3 pages, PASJ in pres

A Calculation of the Viscosity to Entropy Ratio of a Hadronic Gas

We calculate thermodynamic quantities and transport coefficients of a hadronic gas using a Monte Carlo hadronic collision event generator URASiMA. The obtained shear viscosity to entropy density ratio of the hadronic gas is approximately 0.3 -- 0.6 in the range $T$ = 100 -- 180MeV and is quite insensitive to the baryon number density.Comment: 7 pages, 6 figure

Gauge Five-brane Solutions of Co-dimension Two in Heterotic Supergravity

We continue to study the BPS gauge five-brane solutions of codimension two in ten-dimensional heterotic supergravity. The geometry including the dilaton and the NS-NS $B$-field are sourced from the monopole chain in $\mathbb{R}^2 \times S^1$. We find that the geometry is asymptotically Ricci flat and the dilaton is no longer imaginary valued. These properties are contrasted with the smeared counterpart discussed in our previous paper. We perform the T-duality transformations of the solution and find that it never results in a non-geometric object.Comment: 24 pages, 4 figures, typos corrected, version published in JHE

BPS Vortices in Non-relativistic M2-brane Chern-Simons-matter Theory

We study BPS vortices in the mass-deformed non-relativistic {\C N}=6 $U(N)_k\times U(N)_{-k}$ Chern-Simons-matter theory. We focus on the massive deformation that preserves the maximal {\C N}=6 supersymmetry, and consider a non-relativistic limit that carry 14 supercharges. In this non-relativistic field theory we find Jackiw-Pi type exact vortex solutions combined with $S^3$ fuzzy sphere geometry. We analyse their properties and show that they preserve one dynamical, one conformal and five kinematical supersymmetries among the full super Schr\"odinger symmetry.Comment: 22 pages, 3 figures, typos corrected, reference adde