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Quantum SUSY algebra of <i>Q</i>-lumps in the massive Grassmannian sigma model
Nakajima, Hiroaki,Oh, Phillial,Shin, Sunyoung The Institute of Physics 2009 JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL Vol.42 No.12
<P>We compute the <img SRC='http://ej.iop.org/images/1751-8121/42/12/125401/jpa296117ieqn1.gif' ALIGN='MIDDLE' ALT='\mathcal{N}=2 '/> SUSY algebra of the massive Grassmannian sigma model in (2+1) dimensions. We first rederive the action of the model by using Scherk–Schwarz dimensional reduction from <img SRC='http://ej.iop.org/images/1751-8121/42/12/125401/jpa296117ieqn2.gif' ALIGN='MIDDLE' ALT='\mathcal{N}=1 '/> theory in (3+1) dimensions. Then, we perform canonical quantization by using the Dirac method. We find that a particular choice of the operator ordering yields the quantum SUSY algebra of <I>Q</I>-lumps with central extension.</P>
N=4 instanton calculus in <i>Ω</i> and R–R backgrounds
Ito, Katsushi,Nakajima, Hiroaki,Saka, Takuya,Sasaki, Shin Elsevier 2012 Nuclear physics, B Vol.860 No.2
<P><B>Abstract</B></P><P>We study the instanton calculus for N=4 super Yang–Mills theory in ten-dimensional <I>Ω</I>-background with the R-symmetry Wilson line gauge field. From the ADHM construction of instantons in the background, we obtain the deformed instanton effective action. For a certain case we get the effective action of N=<SUP>2⁎</SUP> theory in the <I>Ω</I>-background. We also study the low-energy effective D(−1)-brane action for the D3/D(−1)-brane system in the R–R 3-form field strength backgrounds and find that the action agrees with the instanton effective action in the <I>Ω</I>-background.</P>
Tomohiro Kondo,Suguru Yoshida,Hiroaki Nagai,Ai Takeshita,Masaki Mino,Hiroshi Morioka,Takayuki Nakajima,Ken Takeshi Kusakabe,Toshiya Okada 대한수의학회 2018 Journal of Veterinary Science Vol.19 No.4
In Mongolian gerbils, bilateral common carotid artery occlusion (BCCAO) for several minutes induces ischemia, due to an incomplete circle of Willis, resulting in delayed neuronal cell death in the Cornet d’Ammon 1 (CA1) region of the hippocampus. Neuronal cell death in the hippocampus and changes in behavior were examined after BCCAO was performed for 5 min in the gerbils. One day after BCCAO, the pyramidal neurons of the CA1 region of the hippocampus showed degenerative changes (clumped chromatin in nuclei). At 5 and 10 days after BCCAO, extensive neuronal cell death was observed in the hippocampal CA1 region. Cognitive performance was evaluated by using the radial maze and passive avoidance tests. In the radial maze test, which examines win-stay performance, the number of errors was significantly higher in ischemic gerbils than in sham-operated gerbils on days 1 and 2 post-operation. In the passive avoidance test, the latency and freezing times were significantly shorter in ischemic gerbils than in sham-operated gerbils on the days 1, 2, and 4–6 post-operation. These results indicate that transient forebrain ischemia impairs cognitive performance, even immediately after the ischemic insult when there are only subtle signs of neuronal cell death.