Masato Arai

Hyperkähler sigma models on cotangent bundles of Hermitian symmetric spaces using projective superspace

Kahler manifolds have a natural hyperkahler structure associated with (part of) their cotangent bundles. Using projective superspace, we construct four-dimensional N=2 models on the tangent bundles ...

Polar supermultiplets, hermitian symmetric spaces and hyperkähler metrics

We address the construction of four-dimensional {} = 2 supersymmetric nonlinear sigma models on tangent bundles of arbitrary Hermitian symmetric spaces starting from projective superspace. Using a systematic way of solving the (infinite number of) auxiliary field equations along with the requirement of supersymmetry, we are able to derive a closed form for the Lagrangian on the tangent bundle and to dualize it to give the hyperkahler potential on the cotangent bundle. As an application, the case of the exceptional symmetric space E6/SO(10) × U(1) is explicitly worked out for the first time.

Hyper-Kähler sigma models on (co)tangent bundles with SO ( n ) isometry

Abstract We construct N = 2 supersymmetric nonlinear sigma models whose target spaces are tangent as well as cotangent bundles over the quadric surface Q n − 2 = SO ( n ) / [ SO ( n − 2 ) × U ( 1 ) ] . We use the projective superspace framework, which is an off-shell formalism of N = 2 supersymmetry.

Top quark spin correlations in the Randall-Sundrum model at the CERN Large Hadron Collider

In the Randall-Sundrum model, we study top-antitop pair production and top spin correlations at the Large Hadron Collider. In addition to the standard model processes, there is a new contribution to the top-antitop pair production process mediated by graviton Kaluza-Klein modes in the s-channel. We calculate the density matrix for the top-antitop pair production including the new contribution. With a reasonable parameter choice in the Randall-Sundrum model, we find a sizable deviation of the top-antitop pair production cross section and the top spin correlations from those in the standard model. In particular, resonant productions of the graviton Kaluza-Klein modes give rise to a remarkable enhancement of such a deviation.

Meta-stable Vacuum in Spontaneously Broken N=2 Supersymmetric Gauge Theory

We consider an

Dynamical supersymmetry breaking from meta-stable vacua in an = 1 supersymmetric gauge theory

\mathcal{N}=2

A non-commutative version of the minimal supersymmetric standard model

supersymmetric

Non-anticommutative supersymmetric field theory and quantum shift

SU(2)\ifmmode\times\else\texttimes\fi{}U(1)

Projective superspace and hyperkahler sigma models on cotangent bundles of Hermitian symmetric spaces

gauge theory with

Influence of graviton on top-antitop production at the LHC

{N}_{f}=2