Skein Algebras of the solid torus and symmetric spatial graphs

We use the topological invariant of spatial graphs introduced by S. Yamada to find necessary conditions for a spatial graph to be periodic with a prime period. The proof of the main result is based on computing the Yamada skein algebra of the solid torus then proving that this algebra injects into the Kauffman bracket skein algebra of the solid torus.Comment: 13 pages, 7 figure

Occurrence of Saurida isarankurai Shindo and Yamada 1972 from the west coast of India

A total of eight species of the genus Saurim, Val. 1849, viz. Saurida tumbil (Bloch, 1795), Saurida gracilis Quay and Gaimard, 1824; Saurida undosquamis (Richardson 1848). Sourido longimonus Norman. 1939; Saurida micropectoralis Shindo and Yamada 1972 Sourido wanieso Shindo and Yamada, 1972, Saurida isarankurai Shindo and Yamada. 1972 and Saurida pseudotumbil Dull and Vidya Sagar, 1981 are known to occur in the seas around India (Day 1877, Munro 1955, Norman 1935, Rao 1977, Dutt and Vidya Sagar 1981, Nanda and Ramamoorthi 1982, Fischer and Whitehead 1974, Waples 1983). Dull and Vidya Sagar (1981) reported S. isarankuurai from India on the basis of material from Visakhapatnam and Kakinada, but did not provide any description. Later Nanda and Ramamoorthi (1982) reported this species again as a new record from India on the basis of one specimen from Porto Novo. While studying the taxonomy and biology of lizardfishes from the wcst coast of lndia, we collected several specimens of S. isarankuura

Book Reviewed by John Marston: Yamada, T. S. (2016). Modern Literature of Cambodia: Transnational Voices of Transformation. Seattle, WA: CreateSpace Independent Publishing Platform. 150 pp. ISBN: 1517435463

Book reviewed by John Marson: from Modern Literature of Cambodia: Transnational Voices of Transformation by Yamada, T. S. (2016)

Oblique Corrections in the MSSM at One Loop. I. Scalars

This paper is devoted to reconsider the one-loop oblique corrections arising from the scalar superpartners in the MSSM, i.e, the squarks, the sleptons and the scalars in Higgs sector. We explicitly present the complete one-loop forms of self-energy corrections to the gauge bosons of SM electroweak gauge groups, as well as their descendants the $S$, $T$ and $U$ parameters, which can be directly applied to constrain the parameter space of the MSSM. Our results about one-loop self energies are found to agree with Drees, Hagiwara, and Yamada (1992), Pierce et al. (1997). Nevertheless, the $S$, $T$ and $U$ parameters aren't in agreement with Dobado, Herrero and Penaranda (1999).Comment: short version to appear in Advances in High Energy Physic

Looking backward: From Euler to Riemann

We survey the main ideas in the early history of the subjects on which Riemann worked and that led to some of his most important discoveries. The subjects discussed include the theory of functions of a complex variable, elliptic and Abelian integrals, the hypergeometric series, the zeta function, topology, differential geometry, integration, and the notion of space. We shall see that among Riemann's predecessors in all these fields, one name occupies a prominent place, this is Leonhard Euler. The final version of this paper will appear in the book \emph{From Riemann to differential geometry and relativity} (L. Ji, A. Papadopoulos and S. Yamada, ed.) Berlin: Springer, 2017

Evolution of non-thermal emission from shell associated with AGN jets

We explore the evolution of the emissions by accelerated electrons in shocked shells driven by jets in active galactic nuclei (AGNs). Focusing on powerful sources which host luminous quasars, we evaluated the broadband emission spectra by properly taking into account adiabatic and radiative cooling effects on the electron distribution. The synchrotron radiation and inverse Compton (IC) scattering of various photons that are mainly produced in the accretion disc and dusty torus are considered as radiation processes. We show that the resultant radiation is dominated by the IC emission for compact sources (< 10kpc), whereas the synchrotron radiation is more important for larger sources. We also compare the shell emissions with those expected from the lobe under the assumption that a fractions of the energy deposited in the shell and lobe carried by the non-thermal electrons are $\epsilon_e \sim 0.01$ and $\epsilon_{e, lobe} \sim 1$, respectively. Then, we find that the shell emissions are brighter than the lobe ones at infra-red and optical bands when the source size is > 10kpc, and the IC emissions from the shell at > 10 GeV can be observed with the absence of contamination from the lobe irrespective of the source size. In particular, it is predicted that, for most powerful nearby sources ($L_j \sim 10^{47} ergs s^{-1}$), TeV gamma-rays produced via the IC emissions can be detected by the modern Cherenkov telescopes such as MAGIC, HESS and VERITAS.Comment: 13 pages, 5 figures, accepted for publication in Ap