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18 papers · 1 filter
The Physics of Q-balls
Mitsuo I. Tsumagari
In this thesis we investigate the stationary properties and formation process of a class of nontopological solitons, namely Q-balls. We explore both the quantum-mechanical and clas…
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…
Strong coupling in Horava gravity
Christos Charmousis, Gustavo Niz, Antonio Padilla +1
By studying perturbations about the vacuum, we show that Horava gravity suffers from two different strong coupling problems, extending all the way into the deep infra-red. The firs…
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…
Q-balls in flat potentials
Edmund J. Copeland, Mitsuo I. Tsumagari
We study the classical and absolute stability of Q-balls in scalar field theories with flat potentials arising in both gravity-mediated and gauge-mediated models. We show that the…
On the stability and spectrum of non-supersymmetric AdS(5) solutions of M-theory compactified on Kahler-Einstein spaces
Jonathan E. Martin, Harvey S. Reall
Eleven-dimensional supergravity admits non-supersymmetric solutions of the form AdS(5)xM(6) where M(6) is a positive Kahler-Einstein space. We show that the necessary and sufficien…