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12 papers · 1 filter
Primordial Trispectrum from Isocurvature Fluctuations
David Langlois, Tomo Takahashi
We study non-Gaussianity generated by adiabatic and isocurvature primordial perturbations. We first obtain, in a very general setting, the non-linear perturbations, up to third ord…
Search for the decay
Y. C. Tung, Y. B. Hsiung, J. K. Ahn +66
We performed a search for the decay with the E391a detector at KEK. In the data accumulated in 2005, no event was observed in the signal region. Based on the…
Measurement of the form factors of the decay B0 -> D*- ell+ nu and determination of the CKM matrix element |Vcb|
W. ~Dungel, C. ~Schwanda, I. ~Adachi +124
This article describes a determination of the Cabibbo-Kobayashi-Maskawa matrix element from the decay using 711 fb of Belle data colle…
On Classification of Models of Large Local-Type Non-Gaussianity
Teruaki Suyama, Tomo Takahashi, Masahide Yamaguchi +1
We classify models generating large local-type non-Gaussianity into some categories by using some "consistency relations" among the non-linearity parameters f_{NL}^{local}, τ_{NL}^…
Cohen-Macaulayness of large powers of Stanley-Reisner ideals
Naoki Terai, Ngo Viet Trung
We prove that for m > 2, the m-th symbolic power of a Stanley-Reisner ideal is Cohen-Macaulay if and only if the simplicial complex is a matroid. Similarly, the m-th ordinary power…
Scale-dependence of Non-Gaussianity in the Curvaton Model
Christian T. Byrnes, Kari Enqvist, Tomo Takahashi
We investigate the scale-dependence of f_NL in the self-interacting curvaton model. We show that the scale-dependence, encoded in the spectral index n_{f_NL}, can be observable by…