114 citations · 282 across the 7 of their papers we have counts for
7 papers
On the full quantum trispectrum in multi-field DBI inflation
Shuntaro Mizuno, Frederico Arroja, Kazuya Koyama
We compute the leading order connected four-point function of the primordial curvature perturbation coming from the four-point function of the fields in multi-field DBI inflation m…
Lorentz boost and non-Gaussianity in multi-field DBI-inflation
Shuntaro Mizuno, Frederico Arroja, Kazuya Koyama +1
We show that higher-order actions for cosmological perturbations in the multi-field DBI-inflation model are obtained by a Lorentz boost from the rest frame of the brane to the fram…
On the four-dimensional effective theories in brane-worlds
Frederico Arroja
Models with extra dimensions have attracted much interest recently because they may provide the solution for long standing problems in physics. One interesting and very attractive…
Non-gaussianity from the trispectrum in general single field inflation
Frederico Arroja, Kazuya Koyama
We compute the fourth order action in perturbation theory for scalar and second order tensor perturbations for a minimally coupled single field inflationary model, where the inflat…
Low energy effective theory on a regularized brane in 6D gauged chiral supergravity
Frederico Arroja, Tsutomu Kobayashi, Kazuya Koyama +1
We derive the low energy effective theory on a brane in six-dimensional chiral supergravity. The conical 3-brane singularities are resolved by introducing cylindrical codimension o…
On the 4D effective theory in warped compactifications with fluxes and branes
Kazuya Koyama, Kayoko Koyama, Frederico Arroja
We present a systematic way to derive the four-dimensional effective theories for warped compactifications with fluxes and branes in the ten-dimensional type IIB supergravity. The…