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Gravitino problem in minimal supergravity inflation
Hasegawa, Fuminori,Mukaida, Kyohei,Nakayama, Kazunori,Terada, Takahiro,Yamada, Yusuke North-Holland Pub. Co 2017 Physics letters. Section B Vol.767 No.-
<P><B>Abstract</B></P> <P>We study non-thermal gravitino production in the minimal supergravity inflation. In this minimal model utilizing orthogonal nilpotent superfields, the particle spectrum includes only graviton, gravitino, inflaton, and goldstino. We find that a substantial fraction of the cosmic energy density can be transferred to the longitudinal gravitino due to non-trivial change of its sound speed. This implies either a breakdown of the effective theory after inflation or a serious gravitino problem.</P>
TADASHI HASEGAWA,TAKESHI AKASAKA,YUTAKA MAEDA,MASAHIRO HASHIMOTO,MAKOTO KANDA,TAKAHIRO TSUCHIYA,TAKATSUGU WAKAHARA,YUHEI MIYAUCHI,SHIGEO MARUYAMA,JING LU,SHIGERU NAGASE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2007 NANO Vol.2 No.4
Single-walled carbon nanotubes (SWNTs) synthesized by catalytic decomposition of an alcohol were purified by extraction. The purified SWNTs were characterized on the basis of visible-near infrared (vis-NIR) absorption, photoluminescence and Raman spectroscopic analyses, scanning electron microscopy (SEM) observation, and thermal analysis. Selective extraction of metallic nanotubes was also achieved by the extraction condition.
Fast Circuit Simulation Based on Parallel-Distributed LIM using Cloud Computing System
Inoue, Yuta,Sekine, Tadatoshi,Hasegawa, Takahiro,Asai, Hideki The Institute of Electronics and Information Engin 2010 Journal of semiconductor technology and science Vol.10 No.1
This paper describes a fast circuit simulation technique using the latency insertion method (LIM) with a parallel and distributed leapfrog algorithm. The numerical simulation results on the PC cluster system that uses the cloud computing system are shown. As a result, it is confirmed that our method is very useful and practical.
Fast Circuit Simulation Based on Parallel-Distributed LIM using Cloud Computing System
Yuta Inoue,Tadatoshi Sekine,Takahiro Hasegawa,Hideki Asai 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper describes a fast circuit simulation technique using the latency insertion method (LIM) with a parallel distributed leapfrog algorithm. The numerical simulation results with the cluster that uses the cloud computing system are shown. As a result, it is confirmed that our method is very useful and practical.
Zhu, Yang,Nakanishi, Takahiro,Kanamori, Kazuyoshi,Nakanishi, Kazuki,Ichii, Shun,Iwaida, Kohji,Masui, Yu,Kamei, Toshiyuki,Shimada, Toyoshi,Kumamoto, Akihito,Ikuhara, Yumi H.,Jeon, Mina,Hasegawa, George American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.1
<P>Multifunctional catalysts are of great interest in catalysis because their multiple types of catalytic or functional groups can cooperatively promote catalytic transformations better than their constituents do individually. Herein we report a new synthetic route involving the surface functionalization of nanoporous silica with a rationally designed and synthesized dihydrosilane (3-aminopropylmethylsilane) that leads to the introduction of catalytically active grafted organoamine as well as single metal atoms and ultrasmall Pd or Ag-doped Pd nanoparticles via on-site reduction of metal ions. The resulting nanomaterials serve as highly effective bifunctional dehydrogenative catalysts for generation of H-2 from formic acid.</P>
Fast Circuit Simulation Based on Parallel-Distributed LIM using Cloud Computing System
Yuta Inoue,Tadatoshi Sekine,Takahiro Hasegawa,Hideki Asai 대한전자공학회 2010 Journal of semiconductor technology and science Vol.10 No.1
This paper describes a fast circuit simulation technique using the latency insertion method (LIM) with a parallel and distributed leapfrog algorithm. The numerical simulation results on the PC cluster system that uses the cloud computing system are shown. As a result, it is confirmed that our method is very useful and practical.