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Thermodynamic behavior of fuzzy membranes in pp-wave matrix model
Shin, Hyeonjoon,Yoshida, Kentaroh Elsevier 2005 Physics letters: B Vol.627 No.1
<P><B>Abstract</B></P><P>We discuss a two-body interaction of membrane fuzzy spheres in a pp-wave matrix model at finite temperature by considering the system that a fuzzy sphere rotates with a constant radius <I>r</I> around the other one sitting at the origin in the SO(6) symmetric space. This system of two fuzzy spheres is supersymmetric at zero temperature and there is no interaction between them. Once the system is coupled to the heat bath, supersymmetries are completely broken and non-trivial interaction appears. We numerically show that the potential between fuzzy spheres is attractive and so the rotating fuzzy sphere tends to fall into the origin. The analytic formula of the free energy is also evaluated in the large <I>N</I> limit. It is well approximated by a polylog function.</P>
Point-like graviton scattering in plane-wave matrix model
Shin, Hyeonjoon,Yoshida, Kentaroh IOP Publishing Ltd 2006 Journal of high energy physics Vol.2006 No.4
In a plane-wave matrix model we discuss a two-body scattering of gravitons in the <I>SO</I>(3) symmetric space. In this case the graviton solutions are point-like in contrast to the scattering in the <I>SO</I>(6) symmetric space where spherical membranes are interpreted as gravitons. We concentrate on a configuration in the 1-2 plane where a graviton rotates with a constant radius and the other one elliptically rotates. Then the one-loop effective action is computed by using the background field method. As the result, we obtain the 1/<I>r</I><SUP>7</SUP>-type interaction potential, which strongly suggests that the scattering in the matrix model would be closely related to that in the light-front eleven-dimensional supergravity.
Membrane fuzzy sphere dynamics in plane-wave matrix model
Shin, Hyeonjoon,Yoshida, Kentaroh Elsevier 2005 Nuclear physics, B Vol.709 No.1
<P><B>Abstract</B></P><P>In plane-wave matrix model, the membrane fuzzy sphere extended in the SO(3) symmetric space is allowed to have periodic motion on a sub-plane in the SO(6) symmetric space. We consider a background configuration composed of two such fuzzy spheres moving on the same sub-plane and the one-loop quantum corrections to it. The one-loop effective action describing the fuzzy sphere interaction is computed up to the sub-leading order in the limit that the mean distance <I>r</I> between two fuzzy spheres is very large. We show that the leading order interaction is of the 1/<SUP>r7</SUP> type and thus the membrane fuzzy spheres interpreted as giant gravitons really behave as gravitons.</P>
Homogeneous Yang–Baxter deformations as generalized diffeomorphisms
Sakamoto, Jun-ichi,Sakatani, Yuho,Yoshida, Kentaroh IOP 2017 JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL Vol.50 No.41
<P>Yang–Baxter (YB) deformations of string sigma model provide deformed target spaces. We propose that homogeneous YB deformations always lead to a certain class of <I>β</I>-twisted backgrounds and represent the bosonic part of the supergravity fields in terms of the classical <I>r</I>-matrix associated with the YB deformation. We then show that various <I>β</I>-twisted backgrounds can be realized by considering generalized diffeomorphisms in the undeformed background. Our result extends the notable relation between the YB deformations and (non-commuting) TsT transformations. We also discuss more general deformations beyond the YB deformations.</P>
Aerosol model evaluation using two geostationary satellites over East Asia in May 2016
Goto, Daisuke,Kikuchi, Maki,Suzuki, Kentaroh,Hayasaki, Masamitsu,Yoshida, Mayumi,Nagao, Takashi M.,Choi, Myungje,Kim, Jhoon,Sugimoto, Nobuo,Shimizu, Atsushi,Oikawa, Eiji,Nakajima, Teruyuki Elsevier 2019 Atmospheric research Vol.217 No.-
<P><B>Abstract</B></P> <P>This study newly applies measurements from two geostationary satellites, the Advanced Himawari Imager (AHI) onboard the geostationary satellite Himawari-8 and the Geostationary Ocean Color imager (GOCI) onboard the geostationary satellite COMS, to evaluate a unique regional aerosol-transport model coupled to a non-hydrostatic icosahedral atmospheric model (NICAM) at a high resolution without any nesting technique and boundary conditions of the aerosols. Taking advantage of the unique capability of these geostationary satellites to measure aerosols with unprecedentedly high temporal resolution, we focus on a target area (115°E-155°E, 20°N-50°N) in East Asia in May 2016, which featured the periodic transport of industrial aerosols and a very heavy aerosol plume from Siberian wildfires. The aerosol optical thickness (AOT) fields are compared among the AHI, GOCI, MODIS, AERONET and NICAM data. The results show that both AHI- and GOCI-retrieved AOTs were generally comparable to the AERONET-retrieved ones, with high correlation coefficients of approximately 0.7 in May 2016. They also show that NICAM successfully captured the detailed horizontal distribution of AOT transported from Siberia to Japan on the most polluted day (18 May 2016). The monthly statistical metrics, including correlation between the model and either AHI or GOCI, are estimated to be >0.4 in 42–49% of the target area. With the aid of sensitivity model experiments with and without Siberian wildfires, it was found that a long-range transport of aerosols from Siberian wildfires (from as far as 3000 km) to Japan influenced the monthly mean aerosol levels, accounting for 7–35% of the AOT, 26–49% of the surface PM2.5 concentrations, and 25–66% of the aerosol extinction above 3 km in height over Japan. Therefore, the air pollutants from Siberian wildfire cannot be ignored for the spring over Japan.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A high resolution model generally produces an observed aerosol distribution. </LI> <LI> Next-generation geostationary satellites are applied for aerosol model evaluation. </LI> <LI> Multiple measurement helped to understand the 4-dimensional aerosol structure. </LI> <LI> Siberian wildfires strongly affected the aerosol levels over Japan in May 2016. </LI> </UL> </P>
Conformal twists, Yang–Baxter <i>σ</i>-models & holographic noncommutativity
Araujo, Thiago,Bakhmatov, Ilya,Colgá,in, Eoin Ó,Sakamoto, Jun-ichi,Sheikh-Jabbari, Mohammad M,Yoshida, Kentaroh IOP 2018 JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL Vol.51 No.23
<P>Expanding upon earlier results (Araujo <I>et al</I> 2017 <I>Phys. Rev</I>. D <B>95</B> 105006), we present a compendium of <I>σ</I>-models associated with integrable deformations of AdS<SUB>5</SUB> generated by solutions to homogenous classical Yang–Baxter equation. Each example we study from four viewpoints: conformal (Drinfeld) twists, closed string gravity backgrounds, open string parameters and proposed dual noncommutative (NC) gauge theory. Irrespective of whether the deformed background is a solution to supergravity or generalized supergravity, we show that the open string metric associated with each gravity background is undeformed AdS<SUB>5</SUB> with constant open string coupling and the NC structure Θ is directly related to the conformal twist. One novel feature is that Θ exhibits ‘holographic noncommutativity’: while it may exhibit non-trivial dependence on the holographic direction, its value everywhere in the bulk is uniquely determined by its value at the boundary, thus facilitating introduction of a dual NC gauge theory. We show that the divergence of the NC structure Θ is directly related to the unimodularity of the twist. We discuss the implementation of an outer automorphism of the conformal algebra as a coordinate transformation in the AdS bulk and discuss its implications for Yang–Baxter <I>σ</I>-models and self-T-duality based on fermionic T-duality. Finally, we comment on implications of our results for the integrability of associated open strings and planar integrability of dual NC gauge theories.</P>
Misaki Hanaoka,HIDEHIRO KANEDA,SHINKI OYABU,Yasuki Hattori,Kotomi Tanaka,Sota Ukai,Kazuyuki Shichi,Takehiko Wada,Toyoaki Suzuki,Kentaroh Watanabe,Koichi Nagase,Shunsuke Baba,Chihiro Kochi 한국천문학회 2017 天文學論叢 Vol.32 No.1
To realize large-format compact array detectors covering a wide far-infrared wavelength range up to 200 $\mu$m, we have been developing Blocked-Impurity-Band (BIB) type Ge detectors with the room-temperature surface-activated wafer bonding technology provided by Mitsubishi Heavy Industries. We fabricated various types of $p^+$-$i$ junction devices which possessed a BIB-type structure, and evaluated their spectral response curves using a Fourier transform spectrometer. From the Hall effect measurement, we also obtained the physical characteristics of the $p^+$ layers which constituted the $p^+$-$i$ junction devices. The overall result of our measurement shows that the $p^+$-$i$ junction devices have a promising applicability as a new far-infrared detector to cover a wavelength range of 100--200 μm.