Kokeyama, Keiko, Sato, Shuichi, Nishizawa, Atsushi, Kawamura, Seiji, Chen, Yanbei, Sugamoto, Akio
The displacement- and frequency-noise-free interferometer (DFI) is a multiple laser interferometer array for gravitational-wave detection free from both the displacement noise of optics and laser...
Number theory is considered, by proposing quantum mechanical models and string-like models at zero and finite temperatures, where the factorization of number into prime numbers is viewed as the decay...
Kawazoe, Fumiko, Sugamoto, Akio, Leonhardt, Volker, Sato, Shuichi, Yamazaki, Toshitaka, Fukushima, Mitsuhiro, ...
Some next-generation gravitational-wave detectors, such as the American Advanced LIGO project and the Japanese LCGT project, plan to use power recycled resonant sideband extraction (RSE)...
Kawazoe, Fumiko, Fukushima, Mitsuhiro, Kawamura, Seiji, Leonhardt, Volker, Miyakawa, Osamu, Morioka, Tomoko, ...
Some next-generation gravitational-wave detectors, such as the American Advanced LIGO project and the Japanese LCGT project, plan to use power recycled resonant sideband extraction (RSE)...
Kawazoe, Fumiko, Sugamoto, Akio, Leonhardt, Volker, Sato, Shuichi, Yamazaki, Toshitaka, Fukushima, Mitsuhiro, ...
Some next-generation gravitational-wave detectors, such as the American Advanced LIGO project and the Japanese LCGT project, plan to use power recycled resonant sideband extraction (RSE)...
Kawazoe, Fumiko, Sato, Shuichi, Leonhardt, Volker, Miyakawa, Osamu, Morioka, Tomoko, Nishizawa, Atsushi, ...
LCGT plans to use tuned RSE as the optical configuration for its interferometer. A tuned RSE interferometer has five degrees of freedom that need to be controlled in order to operate a...
Baryogenesis by Quantum Gravity (2007)
Hamada, Ken-ji, Minamizaki, Azusa, Sugamoto, Akio
A novel mechanism of baryogenesis is proposed on the basis of the phase transition from the conformal invariant space-time to the Einstein space-time in quantum gravity. Strong-coupling gravitational...
Can the Baryon Number Density and the Cosmological Constant be interrelated? (2007)
Minamizaki, Azusa, Sugamoto, Akio
A toy model is proposed in which the cosmological constant and the baryon number density of the universe are interrelated. The model combines the mechanism of Dimopoulos and Susskind in which the...
An Exotic Approach to Hadron Physics (2007)
Bando, Masako, Fukase, Yoko, Shock, Jonathan, Sugamoto, Akio, Terunuma, Sachiko
An exotic approach to hadrons is discussed. It is based on the recently developed open-closed string duality explicitly conjectured as the AdS/CFT correspondence. Mesons as well as pentaquarks are...
Meson Strings and Flavor Branes (2006)
Bando, Masako, Sugamoto, Akio, Terunuma, Sachiko
In a QCD-like string model based on D6 flavor branes in the presence of D4 color branes wrapping one of the compactified dimension on an $S^1$, the shape of meson strings in the five dimensional...
Sakata, Shihori, Sato, Shuichi, Somiya, Kentaro, Fukushima, Mitsuhiro, Kawamura, Seiji, Sugamoto, Akio
We developed a control scheme of homodyne detection. To operate the homodyne detector as easy as possible, a simple Michelson interferometer is used. Here a motivation that the control scheme of the...
Distributed Spin in a String Picture of Hadrons (2005)
In a string picture of hadrons, spins are distributed over the whole configuration of string. According to this picture, spin of hadron is discussed in a dual gravity theory of QCD, towards realistic...
Dynamical Origin of Duality between Gauge Theory and Gravity (2004)
Noguchi, Akiko, Sugamoto, Akio
Dynamical origin of duality between gauge theory and gravity is studied using the dual transformation and the formation of graviton as a collective excitation of dual gauge bosons. In this manner,...
Singular Gauge Transformation in Non-Commutative U(2) Gauge Theory (2004)
A method developed by Polychronakos to study singular gauge transformations in 1+2 dimensional non-commutative Chern-Simons gauge theory is generalized from U(1) group to U(2) group. The method...
Pentaquark Baryons in String Theory (2004)
Bando, Masako, Kugo, Taichiro, Sugamoto, Akio, Terunuma, Sachiko
The recently observed pentaquark baryons $\Theta^{+}$ and $\Xi^{--}$ are studied in the dual gravity theory of QCD. By developing a general formulation useful for studying the branched string web in...
'TeV Gamma-ray Crisis' and an Anisotropic Space Model (2004)
Cho, Gi-Chol, Kamoshita, Jun-ichi, Matsunaga, Mariko, Sugamoto, Akio, Watanabe, Isamu
To solve the `TeV gamma crisis', we examine a model whose one spatial direction is discretized at a high energy scale. Assuming the standard extra-galactic IR photon distribution, we evaluate the...
An Attempt to Study Pentaquark Baryons in String Theory (2004)
An attempt to study recently observed Pentaquark baryons is performed in the dual string theory of QCD. Mass formulae for Pentaquark baryons are naively estimated in the Maldacena's prototype model...
Accelerating cosmology in modified gravity with scalar field (2004)
Shaido, Yulia A., Sugamoto, Akio
The modified gravity with 1/R term (R being scalar curvature) and the Einstein-Hilbert term is studied by incorporating the phantom scalar field. A number of cosmological solutions are derived in the...
Nojiri, Shin'ichi, Odintsov, Sergei D., Sugamoto, Akio
There exists a freedom in a class of four-dimensional electroweak theories proposed by Arkani-Hamed et al. relying on deconstruction and Coleman-Weinberg mechanism. The freedom comes from the winding...
Stabilization and radion in de Sitter brane-world (2002)
Nojiri, Shin'ichi, Odintsov, Sergei D., Sugamoto, Akio
We consider the stabilization of de Sitter brane-world. The scalar field bulk-brane theory produces the non-trivial minimum of modulus potential where temporal radion is realized. The hierarchy...
Exciton in Matrix Formulation of Quantum Hall Effect (2002)
Kobashi, Yuko, Mandal, Bhabani Prasad, Sugamoto, Akio
The quantum Hall effect is studied by introducing two different matrix variables for electrons and holes, having Chern-Simons type interactions. By generalizing the constraint condition proposed by...
CERN LEP2 constraint on 4D QED having dynamically generated spatial dimension (2001)
Cho, Gi-Chol, Izumi, Etsuko, Sugamoto, Akio
We study 4D QED in which one spatial dimension is dynamically generated from 3D action, following the mechanism proposed by Arkani-Hamed, Cohen and Georgi. In this model, the generated fourth...
Old Fashioned Duality for D-brane and String (2001)
Endo, Rika, Seo, Koichi, Sugamoto, Akio
Old fashioned duality used to derive the closed string field theory for magnetic vortex from the gauge theory with Higgs scalar, is applied to the string theories. The bosonic sring theory coupled to...
Mixing Matrix of Quarks Having Natural Twisting in E_6 Grand Unified Model (2001)
Obara, Midori, Cho, Gi-Chol, Nagashima, Makiko, Sugamoto, Akio
Mass matrix of quarks is studied in the Supersymmetric $E_6$ Grand Unified Theory (GUT). The fundamental representation $\textbf{27}$ in $E_6$ which corresponds to one generation contains two sets of...
Inclusive dileptonic rare B decays with an extra generation of vector-like quarks (2001)
Ahmady, Mohammad R., Nagashima, Makiko, Sugamoto, Akio
We investigate the leading effects of extending the Standard Model of electroweak interactions by an extra iso-singlet up- and down- type quark pair on various distributions and total branching ratio...
4d Gauge Theory and Gravity Generated from 3d Ones at High Energy (2001)
Dynamical generation of 4d gauge theories and gravity at low energy from the 3d ones at high energy is studied, based on the fermion condensation mechanism recently proposed by Arkani-Hamed, Cohen...
$B\to \pi \pi, K \pi$ Decays in QCD Improved Factorization Approach (2000)
Muta, Taizo, Sugamoto, Akio, Yang, Mao-Zhi, Yang, Ya-Dong
Motivated by recent measurements, we investigate $B\to \pi \pi, K \pi$ decay modes in the framework of QCD improved factorization, which was recently proposed by Beneke $et al$. We find that all the...
Contributions of vector-like quarks to radiative B meson decay (2000)
Aoki, Mayumi, Asakawa, Eri, Nagashima, Makiko, Oshimo, Noriyuki, Sugamoto, Akio
We study the decay B\to X_s\gamma in a minimal extension of the standard model with extra up- and down-type quarks whose left- and right-handed components are both SU(2) singlets. Constraints on the...
Production of CP-even and CP-odd Higgs bosons at Muon colliders (2000)
Asakawa, Eri, Watanabe, Isamu, Sugamoto, Akio
In the $s$-channel Higgs-boson-exchange processes, the interference between the amplitudes for CP-even and CP-odd Higgs bosons is sizable, if the helicities of initial and final particles are...
Asakawa, Eri, Kamoshita, Jun-ichi, Sugamoto, Akio, Watanabe, Isamu
We present the effects of heavy CP-even (H) and CP-odd (A) Higgs bosons on the production cross section of the process $\gamma\gamma$ $\to t\bar{t}$ at the energy around the mass poles of the Higgs...
Yamaguchi, Azusa, Sugamoto, Akio
Applying Genetic Algorithm for the Lattice Gauge Theory is formed to be an effective method to minimize the action of gauge field on a lattice. In 4 dimensions, the critical point and the Wilson loop...
The annihilation decay B_c \to eta' l \nu (1999)
We first investigate the semileptonic annihilation decay B_c \to \eta' l\nu in QCD. We find that the $\eta'$ momentum distribution is peaked within its small recoil region due to the loop effects....
CP-odd WWZ couplings induced by vector-like quarks (1999)
Asakawa, Eri, Marui, Miho, Oshimo, Noriyuki, Saito, Tomomi, Sugamoto, Akio
A minimal extension of the standard model includes extra quarks with charges 2/3 and/or -1/3, whose left-handed and right-handed components are both SU(2) singlets. This model predicts new...
D0-brane description of the charged black hole (1998)
Kato, Yuriko, Nojiri, Shin'ichi, Sugamoto, Akio
The charged black hole is considered from the viewpoint of D0-brane in the Matrix theory. It can be obtained from the Kaluza-Klein mechanism by boosting the Schwarzschild black hole in a circle,...
Baryon asymmetry and neutron EDM (1998)
Aoki, Mayumi, Oshimo, Noriyuki, Sugamoto, Akio
Baryon asymmetry of the universe can be generated by new sources of $CP$ violation intrinsic in supersymmetric extension of the standard model. This scenario predicts the neutron electric dipole...
Asakawa, Eri, Kamoshita, Jun-ichi, Sugamoto, Akio
We examine the stop production scenario for the anomalous excess of high $Q^2$ events observed at HERA, by taking into account the constraints coming from the leptoquark search at Tevatron and the...
Electroweak Baryogenesis and Neutron Electric Dipole Moment from Supersymmetry (1998)
Aoki, Mayumi, Oshimo, Noriyuki, Sugamoto, Akio
Baryogenesis at the electroweak phase transition is discussed within the framework of the supersymmetric standard model. Implications of baryon asymmetry for the electric dipole moment of the neutron...
A Rule of Thumb Derivation of Born-Infeld Action for D-branes (1998)
Endo, Rika, Kuriki, Rie, Nojiri, Shin'ichi, Sugamoto, Akio
A rule of thumb derivation of the Dirac-Born-Infeld action for D-branes is studied \`a la Fradkin and Tseytlin, by simply integrating out of the superstring coordinates in a narrow strip attached to...
CP-odd Anomalous W-boson Couplings from Supersymmety (1997)
Kitahara, Minako, Marui, Miho, Oshimo, Noriyuki, Saito, Tomomi, Sugamoto, Akio
The supersymmetric standard model contains a new CP-violating phase in the mass matrices for charginos and neutralinos, which could induce CP-odd anomalous couplings for the WWZ and WW\gamma vertices...
Vacuum polarization of supersymmetric D-brane in the constant electromagnetic field (1997)
Kadoyoshi, Tomoko, Nojiri, Shin'ichi, Odintsov, Sergei D., Sugamoto, Akio
We study the vacuum polarization of supersymmetric toroidal D-brane placed in the constant electromagnetic field. Explicit calculation of the one-loop effective potential is performed for membrane...
Intermediate psuedoscalar resonance contributions to B->X_s photon photon (1997)
Ahamdy, Mohammad R., Kou, Emi, Sugamoto, Akio
We calculate the decay rate B-> X_s photon photon via intermediate psuedoscalar charmonium eta_c. This process is thought to be the main long-distance contribution which dominates the corresponding...
Study of CP Violation: Electroweak Baryogenesis and Anomalous W-Boson Couplings (1997)
Sugamoto, Akio, Aoki, Mayumi, Kadoyoshi, Tomoko, Marui, Miho, Oshimo, Noriyuki, Saito, Tomomi, ...
The contributions from the Ochanomizu CP Study Group to the KEK meetings on "CP violation and its origin" (1993-1997) are summarized on electroweak baryogenesis and anomalous W-boson couplings. We...
Electric Dipole Moments of Neutron and Electron in Supersymmetric Model (1997)
Aoki, Mayumi, Kadoyoshi, Tomoko, Sugamoto, Akio, Oshimo, Noriyuki
The electric dipole moments (EDMs) of the neutron and the electron are reviewed within the framework of the supersymmetric standard model (SSM) based on grand unified theories coupled to N=1...
Implications of baryon asymmetry for the electric dipole moment of the neutron (1997)
Aoki, Mayumi, Sugamoto, Akio, Oshimo, Noriyuki
We study baryogenesis at the electroweak phase transition of the universe within the framework of the supersymmetric standard model (SSM) based on N=1 supergravity. This model contains a new source...
Electroweak baryogenesis from chargino transport in the supersymmetric model (1996)
Aoki, Mayumi, Oshimo, Noriyuki, Sugamoto, Akio
We study the baryon asymmetry of the universe in the supersymmetric standard model (SSM). At the electroweak phase transition, the fermionic partners of the charged SU(2) gauge bosons and Higgs...
Old-fashioned dualities revisited (1996)
In the lectures given at '96 Kashikojima Summer Institute, Amagi-Highland Seminars, and Yukawa Institute Workshop, the old-fashioned dualities and the theory of extended objects are reviewed,...
Baryogenesis with vector-like quark model in charge transport mechanism (1996)
Uesugi, Tomoko, Sugamoto, Akio, Yamaguchi, Azusa
The electroweak baryogenesis is studied in the charge transport mechanism with the vector-like quark model. Introducing an extra vector-like up-type quark and a singlet Higgs scalar with the mass of...
Being Fascinated by Strings and Membranes: Is Kikkawa-Type Physics Possible at Ochanomizu? (1996)
On the occasion of the 60th birthday of Professor Keiji Kikkawa, Kikkawa-type physics performed at Ochanomizu was personally reviewed, and the generation of the metric is discussed with the...
Stringy and Membranic Theory of Swimming of Micro-organisms (1996)
Kawamura, Masako, Nojiri, Shin'ichi, Sugamoto, Akio
When the swimming of micro-organisms is viewed from the string and membrane theories coupled to the velocity field of the fluid, a number of interesting results are derived; 1) importance of the area...
Collective Motion of Micro-organisms from Field Theoretical Viewpoint (1995)
Nojiri, Shin'ichi, Kawamura, Masako, Sugamoto, Akio
We analyze the collective motion of micro-organisms in the fluid and consider the problem of the red tide. The red tide is produced by the condensation of the micro-organisms, which might be a...
Is the Condensation of Strings the Origin of Einstein Gravity ? (1995)
KATSUKI, Miyuki, KUBOTANI, Hiroto, NOJIRI, Shin'ichi, SUGAMOTO, Akio
A mechanism of generating the metric is proposed, where the Kalb-Ramond symmetry existing in the topological BF theory is broken through the condensation of the string fields which are so introduced...
Two-Form Gravity and the Generation of Space-Time (1995)
KATSUKI, Miyuki, NOJIRI, Shin'ichi, SUGAMOTO, Akio
In the framework of the two-form gravity, which is classically equivalent to the Einstein gravity, the one-loop effective potential for the conformal factor of metric is calculated in the finite...
Baryon Asymmetry: Evidence of CP Violation and Phase Transition in the Early Universe ? (1995)
A talk was given on the baryon asymmetry of our universe within the electroweak energy scale which was the theme for the 23rd INS Symposium. It was intended for non-experts by a non-expert speaker. A...
Quantum Mechanics for the Swimming of Micro-Organism in Two Dimensions (1994)
Nojiri, Shin'ichi, Kawamura, Masako, Sugamoto, Akio
In two dimensional fluid, there are only two classes of swimming ways of micro-organisms, {\it i.e.}, ciliated and flagellated motions. Towards understanding of this fact, we analyze the swimming...
Electroweak Baryogenesis and the Phase Transition Dynamics (1994)
Yamaguchi, Azusa, Sugamoto, Akio
The baryogenesis is reanalyzed based on the model by A.G.Cohen et al., in which the lepton number, generated by the neutrinos' scattering from the bubble walls appearing in the development of the...
Swimming of Microorganism and the String- and Membrane- like Algebra (1994)
Kawamura, Masako, Sugamoto, Akio, Nojiri, Shin'ichi
Swimming of microorganisms is further developed from a viewpoint of strings and membranes swimming in the incompressible fluid of low Reynolds number. In our previous paper the flagellated motion was...
Swimming of Microorganisms Viewed from String and Membrane Theories (1993)
Kawamura, Masako, Sugamoto, Akio, Nojiri, Shin'ichi
Swimming of microorganisms is studied from a viewpoint of extended objects (strings and membranes) swimming in the incompressible f luid of low Reynolds number. The flagellated motion is analyzed in...