Studying Gaugino Mass in Semi-Direct Gauge Mediation (2009)
We study gaugino mass generation in the context of semi-direct gauge mediation models, where the messengers are charged under both the hidden sector and the standard model gauge groups while they do...
Strongly Coupled Semi-Direct Mediation of Supersymmetry Breaking (2008)
Strongly coupled semi-direct gauge mediation models of supersymmetry breaking through massive mediators with standard model charges are investigated by means of composite degrees of freedom. Sizable...
Conformal Gauge Mediation and Light Gravitino of Mass m_{3/2} (2008)
Ibe, M., Nakayama, Y., Yanagida, T. T.
We discuss a class of gauge mediated supersymmetry breaking models with conformal invariance above the messenger mass scale (conformal gauge mediation). The spectrum of the supersymmetric particles...
Conformal Supersymmetry Breaking and Dynamical Tuning of the Cosmological Constant (2008)
Ibe, M., Nakayama, Y., Yanagida, T. T.
We propose "conformal supersymmetry breaking" models, which tightly relate the conformal breaking scale (i.e. R-symmetry breaking scale) and the supersymmetry breaking scale. The both scales are...
R-invariant New Inflation Model vs Supersymmetric Standard Model (2007)
We revisit the implications of the R-invariant New Inflation model to the supersymmetric standard model in light of recent discussion of gravitino production processes by the decay of the inflaton or...
Conformal Gauge Mediation (2007)
Ibe, M., Nakayama, Y., Yanagida, T. T.
We propose a one-parameter theory for gauge mediation of supersymmetry (SUSY) breaking. The spectrum of SUSY particles such as squarks and sleptons in the SUSY standard-model and the dynamics of...
Possible Signals of Wino LSP at the Large Hadron Collider (2006)
Ibe, M., Moroi, Takeo, Yanagida, T. T.
We consider a class of anomaly-mediated supersymmetry breaking models where gauginos acquire masses mostly from anomaly mediation while masses of other superparticles are from Kahler interactions,...
A New Inflation Model with Anomaly-mediated Supersymmetry Breaking (2006)
Ibe, M., Shinbara, Y., Yanagida, T. T.
If there are a large number of vacua, multi-inflation may be a more mediocre phenomenon rather than a single inflation. In the multi-inflation scenario, new inflation is most likely the last...
The Polonyi Problem and Upper bound on Inflation Scale in Supergravity (2006)
Ibe, M., Shinbara, Y., Yanagida, T. T.
We reconsider the Polonyi problem in gravity-mediation models for supersymmetry (SUSY) breaking. It has been argued that there is no problem in the dynamical SUSY breaking scenarios, since the...
Eluding the BBN constraints on the stable gravitino (2006)
Buchmuller, W., Hamaguchi, K., Ibe, M., Yanagida, T. T.
We investigate how late-time entropy production weakens the Big-Bang Nucleosynthesis (BBN) constraints on the gravitino as lightest superparticle with a charged slepton as next-to-lightest...
Minimal Supergravity, Inflation, and All That (2006)
Ibe, M., Shinbara, Y., Yanagida, T. T.
We consider an inflationary model in the hidden-sector broken supergravity with an effectively large cutoff. The inflaton decay into right-handed neutrinos naturally causes the observed baryon...
Eluding the BBN Constraints on the Stable Gravitino. (2006)
W. Buchmüller, DESY Forschung Hochenergiephysik, K. Hamaguchi, M. Ibe, T.T. Yanagida
Internal report | Preprint
More on Conformally Sequestered SUSY Breaking (2005)
Ibe, M., Nakayama, Yu, Shinbara, Y., Yanagida, T.
We extend our models for conformal sequestering of dynamical supersymmetry breaking with decoupling vector-like matter in several different ways. These extensions enable us to simplify concrete model...
Conformally Sequestered SUSY Breaking in Vector-like Gauge Theories (2005)
Ibe, M., Nakayama, Yu, Shinbara, Y., Yanagida, T.
We provide, in a framework of vector-like gauge theories, concrete models for conformal sequestering of dynamical supersymmetry (SUSY) breaking in the hidden sector. If the sequestering is...
Dark Matter and Baryon Asymmetry of the Universe in Large-Cutoff Supergravity (2005)
Ibe, M., Moroi, Takeo, Yanagida, T.
We propose a consistent scenario of the evolution of the universe based on the large cutoff supergravity (LCSUGRA) hypothesis of supersymmetry breaking, where the gravitino and sfermion become as...
Realization of Minimal Supergravity (2004)
Minimal supergravity mediation of supersymmetry breaking has attracted much attention due to its simplicity, which leads to its predictive power. We consider how Nature possibly realizes minimal...
If a bosonic partner of a right-handed neutrino dominates the early universe sufficiently before its decay, important ingredients in the present universe are related to physics of the right-handed...
Upper Bound On Gluino Mass From Thermal Leptogenesis (2003)
Fujii, M., Ibe, M., Yanagida, T.
Thermal leptogenesis requires the reheating temperature $T_R \gsim 3\times 10^{9}$ GeV, which contradicts a recently obtained constraint on the reheating temperature, $T_R \lsim 10^6$ GeV, for the...
Thermal Leptogenesis and Gauge Mediation (2003)
Fujii, M., Ibe, M., Yanagida, T.
We show that a mini-thermal inflation occurs naturally in a class of gauge mediation models of supersymmetry (SUSY) breaking, provided that the reheating temperature T_R of the primary inflation is...
Upper Bound of Proton Life-Time in Product-Group Unification (2003)
Models of supersymmetric grand unified theories based on SU(5)_GUT \times U(N)_H gauge group (N = 2,3) have a symmetry that guarantees light two Higgs doublets and absence of dimension-five proton...
Rüthlein, J, Ibe, M, Burghardt, W, Mössner, J, Auer, I O
Acute exacerbations of chronic inflammatory bowel disease (ulcerative colitis and Crohn's disease) are characterised by an increase in immunoglobulin G (IgG) positive cells in the mucosa, whereas...