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Apr 20, 2017

Extended Gamma-ray Emission from the G25.0+0.0 Region: A Star Forming…

We report a study of extended $\gamma$-ray emission with the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope, which is likely …
Sep 16, 2013
Number Theory

Desingularization of complex multiple zeta-functions, fundamentals of…

This paper deals with a multiple version of zeta- and L-functions both in the complex case and in the p-adic case: [I] Our motivation in the complex …
Jul 12, 2017

Spins of primordial black holes formed in the matter-dominated phase …

Angular momentum plays very important roles in the formation of PBHs in the matter-dominated phase if it lasts sufficiently long. In fact, most colla…
Jan 22, 2019

In this review, we have discussed recent advances in the Horndeski theory [20] and its healthy extensions, i.e., degenerate higher-order scalar-tensor (DHOST) theories [147]. We have reviewed how the Horndeski theory was “rediscovered” in its modern…

Horndeski theory and beyond: a review

This article is intended to review the recent developments in the Horndeski theory and its generalization, which provide us with a systematic underst…
Jul 09, 2015

Time-Dependent Modeling of Gamma-ray Flares in Blazar PKS1510-089

Here we present a new approach for constraining luminous blazars, incorporating fully time-dependent and self-consistent modeling of bright gamma-ray…
Oct 12, 2015
Algebraic Geometry

Degeneration and curves on K3 surfac

This paper studies curves on quartic K3 surfaces, or more generally K3 surfaces which are complete intersection in weighted projective spaces. A folk…
Jul 04, 2007

In this paper, we have analyzed spherically symmetric self-similar spacetimes. We have shown that the metric of these spacetimes is conformally static, with the conformal structure being determined by the form of the velocity function V. The homothe…

Self-similar cosmological solutions with dark energy. I: formulation …

Based on the asymptotic analysis of ordinary differential equations, we classify all spherically symmetric self-similar solutions to the Einstein equ…
Mar 29, 2010
Combinatorics

Roots of Ehrhart polynomials arising from graphs

Several polytopes arise from finite graphs. For edge and symmetric edge polytopes, in particular, exhaustive computation of the Ehrhart polynomials n…
Sep 26, 2016

Expansion measurement of Supernova Remnant RX J1713.7-3946

Supernova remnant (SNR) RX J1713.7-3946 is well known for its bright TeV gamma-ray emission with shell-like morphology. To constrain the hydrodynamic…
Oct 24, 2017

Performance of Complex Langevin Simulation in 0+1 dimensional massive…

Statistical sampling with the complex Langevin (CL) equation is applied to (0+1)-dimensional Thirring model, and its uniform-field variant, at finite…
Feb 03, 2016
Number Theory
Symbolic Computation

A well-known theorem [dwork-geratto-sullivan:Gfunctions, Theorem 6.1] asserts that each extremal point M in the Newton polygon NP(P) of a polynomial P∈K[X] corresponds to a factorization P=AB where the Newton polygon of A (resp. B) is given by the p…

Division and Slope Factorization of p-Adic Polynomials

We study two important operations on polynomials defined over complete discrete valuation fields: Euclidean division and factorization. In particular…
Nov 13, 2017

Extended source effect on microlensing light curves by an Ellis wormh…

We can survey an Ellis wormhole which is the simplest Morris-Thorne wormhole in our galaxy with microlensing. The light curve of a point source micro…
Jul 24, 2016

Strong deflection limit analysis and gravitational lensing of an Elli…

Observations of gravitational lenses in strong gravitational fields give us a clue to understanding dark compact objects. In this paper, we extend a …
Jul 04, 2007

Self-similar cosmological solutions with dark energy. II: black holes…

We use a combination of numerical and analytical methods, exploiting the equations derived in a preceding paper, to classify all spherically symmetri…
Jul 20, 2007

Analytical solutions for black-hole critical behaviour

Dynamical Einstein cluster is a spherical self-gravitating system of counterrotating particles, which may expand, oscillate and collapse. This system…
Jul 07, 2011

Numerical simulation of the $\mathcal{N}=(2,2)$ Landau-Ginzburg model

The two-dimensional $\mathcal{N}=(2,2)$ Wess-Zumino (WZ) model with a cubic superpotential is numerically studied with a momentum-cutoff regularizati…
Aug 21, 2013
Mathematical Physics

G/G gauged WZW-matter model, Bethe Ansatz for q-boson model and Com…

We investigate the correspondence between two dimensional topological gauge theories and quantum integrable systems discovered by Moore, Nekrasov, Sh…
Oct 05, 2010

Collision of an innermost stable circular orbit particle around a Ker…

We derive a general formula for the center-of-mass (CM) energy for the near-horizon collision of two particles of the same rest mass on the equatoria…
Dec 26, 2011

We observed the first unidentified TeV γ-ray source TeV J2032+4130 with Suzaku, and detected two structures of diffuse X-ray emission. The position of the structure 1 is coincident with the GeV γ-ray pulsar. We also detected a hint of diffuse emissi…

Detection of X-Ray Emission from the Unidentified TeV Gamma-Ray Sourc…

We observed the first unidentified TeV gamma-ray source TeV J2032+4130 with Suzaku. Owing to Suzaku's high sensitivity for detection of diffuse X-ray…
Jan 31, 2016
Symbolic Computation

On p-adic differential equations with separation of variables

Several algorithms in computer algebra involve the computation of a power series solution of a given ordinary differential equation. Over finite fiel…
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