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8 papers · 2 filters
Primordial non-Gaussianities of gravitational waves beyond Horndeski
Yuji Akita, Tsutomu Kobayashi
We clarify the features of primordial non-Gaussianities of tensor perturbations in Gao's unifying framework of scalar-tensor theories. The general Lagrangian is given in terms of t…
Correspondences between WZNW models and CFTs with W-algebra symmetry
Thomas Creutzig, Yasuaki Hikida, Peter B. Ronne
We study theories with W-algebra symmetries and their relation to WZNW models on (super-)groups. Correlation functions of the WZNW models are expressed in terms of correlators of C…
Suppressing the primordial tensor amplitude without changing the scalar sector in quadratic curvature gravity
Kohji Yajima, Tsutomu Kobayashi
We address the question of how one can modify the inflationary tensor spectrum without changing at all the successful predictions on the curvature perturbation. We show that this i…
Higgs phenomenon for higher spin fields on AdS_3
Thomas Creutzig, Yasuaki Hikida
In a previous work, a marginal deformation of 2d coset type model with N=3 superconformal symmetry was studied, and it was interpreted as a change of boundary conditions for bulk f…
On the singlet projector and the monodromy relation for psu(2, 2|4) spin chains and reduction to subsectors
Yoichi Kazama, Shota Komatsu, Takuya Nishimura
As a step toward uncovering the relation between the weak and the strong coupling regimes of the super Yang-Mills theory beyond the specral level, we have developed…
Galilean Creation of the Inflationary Universe
Tsutomu Kobayashi, Masahide Yamaguchi, Jun'ichi Yokoyama
It has been pointed out that the null energy condition can be violated stably in some non-canonical scalar-field theories. This allows us to consider the Galilean Genesis scenario…