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Can thick braneworlds be self-consistent?
Masato Minamitsuji, Wade Naylor, Misao Sasaki
We discuss the backreaction of a massless, minimally coupled, quantized scalar field on a thick, two-dimensional de Sitter (dS) brane as an extension of our previous work. We show…
Forming sub-horizon black holes at the end of inflation
David. H Lyth, Karim A. Malik, Misao Sasaki +1
Previous authors have calculated the mass function of primordial black holes only on scales which are well outside the horizon at the end of inflation. Here we extend the calculati…
Graviton emission from a higher-dimensional black hole
A. S. Cornell, Wade Naylor, Misao Sasaki
We discuss the graviton absorption probability (greybody factor) and the cross-section of a higher-dimensional Schwarzschild black hole (BH). We are motivated by the suggestion tha…
Conservation of nonlinear curvature perturbations on super-Hubble scales
Misao Sasaki
We consider general, non-linear curvature perturbations on scales greater than the Hubble horizon scale by invoking an expansion in spatial gradients, the so-called gradient expans…
Post-inflationary behavior of adiabatic perturbations and tensor-to-scalar ratio
Andrei Linde, Viatcheslav Mukhanov, Misao Sasaki
We explain why it is so difficult and perhaps even impossible to increase the cosmological tensor-to-scalar perturbation ratio during the post-inflationary evolution of the univers…
Vacuum destabilization from Kaluza-Klein modes in an inflating brane
Oriol Pujolas, Misao Sasaki
We discuss the effects from the Kaluza-Klein modes in the brane world scenario when an interaction between bulk and brane fields is included. We focus on the bulk inflaton model, w…
A New delta N Formalism for Multi-Component Inflation
Hyun-Chul Lee, Misao Sasaki, Ewan D. Stewart +2
The delta N formula that relates the final curvature perturbation on comoving slices to the inflaton perturbation on flat slices after horizon crossing is a powerful and intuitive…
Gauss-Bonnet dark energy
Shin'ichi Nojiri, Sergei D. Odintsov, Misao Sasaki
We propose the Gauss-Bonnet dark energy model inspired by string/M-theory where standard gravity with scalar contains additional scalar-dependent coupling with Gauss-Bonnet invaria…
Constraining Cosmological Parameters by the Cosmic Inversion Method
Noriyuki Kogo, Misao Sasaki, Jun'ichi Yokoyama
We investigate the question of how tightly we can constrain the cosmological parameters by using the ``cosmic inversion'' method in which we directly reconstruct the power spectrum…
Kaluza-Klein gravitons are negative energy dust in brane cosmology
Masato Minamitsuji, Misao Sasaki, David Langlois
We discuss the effect of Kaluza-Klein (KK) modes of bulk metric perturbations on the second Randall-Sundrum (RS II) type brane cosmology, taking the possible backreaction in the bu…