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Primordial trispectrum from inflation
Christian T. Byrnes, Misao Sasaki, David Wands
We use the delta N-formalism to describe the leading order contributions to the primordial power spectrum, bispectrum and trispectrum in multiple-field models of inflation at leadi…
Gradient expansion approach to nonlinear superhorizon perturbations
Yoshiharu Tanaka, Misao Sasaki
Using the gradient expansion approach, we formulate a nonlinear cosmological perturbation theory on super-horizon scales valid to , where is the expansion parameter ass…
Constraints on the primordial curvature perturbation from primordial black holes
Ignacio Zaballa, Anne M. Green, Karim A. Malik +1
We calculate the constraints on the primordial curvature perturbation at the end of inflation from the present day abundance of Primordial Black Holes (PBHs), as a function of the…
Classical and quantum radiation from a moving charge in an expanding universe
Hidenori Nomura, Misao Sasaki, Kazuhiro Yamamoto
We investigate photon emission from a moving particle in an expanding universe. This process is analogous to the radiation from an accelerated charge in the classical electromagnet…
Large-scale magnetic fields in the inflationary universe
Kazuharu Bamba, Misao Sasaki
The generation of large-scale magnetic fields is studied in inflationary cosmology. We consider the violation of the conformal invariance of the Maxwell field by dilatonic as well…
Non-Gaussianity and constraints for the variance of perturbations in the curvaton model
Jussi Valiviita, Misao Sasaki, David Wands
Recently, the primordial non-Gaussianity in the curvaton model has been predicted assuming sudden decay of the curvaton. We extend the calculation to non-instantaneous decay by emp…
Gravitational scalar field coupled directly to the Maxwell field and its effect to solar-system experiments
Yasunori Fujii, Misao Sasaki
The effect of the massless gravitational scalar field assumed to couple directly to the Maxwell field to the solar-system experiments is estimated. We start with discussing the the…
Volume stabilization in a warped flux compactification model
Masato Minamitsuji, Wade Naylor, Misao Sasaki
We investigate the stability of the extra dimensions in a warped, codimension two braneworld that is based upon an Einstein-Maxwell-dilaton theory with a non-vanishing scalar field…
Non-Gaussianity of the primordial perturbation in the curvaton model
Misao Sasaki, Jussi Valiviita, David Wands
We use the delta N -formalism to investigate the non-Gaussianity of the primordial curvature perturbation in the curvaton scenario for the origin of structure. We numerically calcu…
Wronskian Formulation of the Spectrum of Curvature Perturbations
Shuichiro Yokoyama, Takahiro Tanaka, Misao Sasaki +1
We present a new formulation for the evaluation of the primordial spectrum of curvature perturbations generated during inflation, using the fact that the Wronskian of the scalar fi…
Critical escape velocity of black holes from branes
Antonino Flachi, Oriol Pujolas, Misao Sasaki +1
In recent work we have shown that a black hole stacked on a brane escapes once it acquires a recoil velocity. This result was obtained in the {\it probe-brane} approximation, {\it…
Dynamics of domain walls intersecting black holes
Antonino Flachi, Oriol Pujolas, Misao Sasaki +1
Previous studies concerning the interaction of branes and black holes suggested that a small black hole intersecting a brane may escape via a mechanism of reconnection. Here we con…