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11 papers · 2 filters
Matter scattering in gravity and unitarity
Yugo Abe, Takeo Inami, Keisuke Izumi +1
We investigate the ultraviolet (UV) behavior of two-scalar elastic scattering with graviton exchanges in higher curvature gravity theory. In the Einstein gravity, matter scattering…
Radiative Kähler moduli stabilization
Tatsuo Kobayashi, Naoya Omoto, Hajime Otsuka +1
We propose a new type of Kähler moduli stabilization mechanisms in type IIB superstring theory on Calabi-Yau manifolds with the positive Euler number. The overall Kähler modulus ca…
Criticality at absolute zero from Ising model on two-dimensional dynamical triangulations
Yuki Sato, Tomo Tanaka
We reconsider the criticality of the Ising model on two-dimensional dynamical triangulations based on the hermitian two-matrix model with the introduction of a loop-co…
Completeness of scattering states of the Dirac Hamiltonian with a step potential
M. Ochiai, H. Nakazato
The completeness, together with the orthonormality, of the eigenfunctions of the Dirac Hamiltonian with a step potential is shown explicitly. These eigenfunctions describe the scat…
Full diffeomorphism and Lorentz invariance in 4D superfield description of 6D SUGRA
Hiroyuki Abe, Shuntaro Aoki, Yutaka Sakamura
We complete the four-dimensional superfield description of six-dimensional supergravity. The missing ingredients in the previous works are the superfields that contain…
Condensate of Massive Graviton and Dark Matter
Katsuki Aoki, Kei-ichi Maeda
We study coherently oscillating massive gravitons in the ghost-free bigravity theory. This coherent field can be interpreted as a condensate of the massive gravitons. We first defi…
On the Flux Vacua in F-theory Compactifications
Yoshinori Honma, Hajime Otsuka
We study moduli stabilization of the F-theory compactified on an elliptically fibered Calabi-Yau fourfold. Our setup is based on the mirror symmetry framework including brane defor…
Supersymmetry preserving and breaking degenerate vacua, and radiative moduli stabilization
Tatsuo Kobayashi, Naoya Omoto, Hajime Otsuka +1
We propose a new type of moduli stabilization scenario where the supersymmetric and supersymmetry-breaking minima are degenerate at the leading level. The inclusion of the loop-cor…
Kähler moduli stabilization in semi-realistic magnetized orbifold models
Hiroyuki Abe, Tatsuo Kobayashi, Keigo Sumita +1
We study Kähler moduli stabilizations in semi-realistic magnetized D-brane models based on toroidal orbifolds. In type IIB compactifications, 3-form fluxes can st…
Cosmological Dynamics of D-BIonic and DBI Scalar Field and Coincidence Problem of Dark Energy
Sirachak Panpanich, Kei-ichi Maeda, Shuntaro Mizuno
We study the cosmological dynamics of D-BIonic and DBI scalar field, which is coupled to matter fluid. For the exponential potential and the exponential couplings, we find a new an…
Brane-localized masses in magnetic compactifications
Makoto Ishida, Kenji Nishiwaki, Yoshiyuki Tatsuta
We discuss effects of the brane-localized mass terms on the fixed points of the toroidal orbifold under the presence of background magnetic fluxes, where multiple lowest…