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Self-force Regularization in the Schwarzschild Spacetime
Wataru Hikida, Hiroyuki Nakano, Misao Sasaki
We discuss the gravitational self-force on a particle in a black hole space-time. For a point particle, the full (bare) self-force diverges. The metric perturbation induced by a pa…
Quantum Fluctuations for de Sitter Branes in Bulk AdS(5)
Wade Naylor, Misao Sasaki
The vacuum expectation value of the square of the field fluctuations of a scalar field on a background consisting of {\it two} de Sitter branes embedded in an anti-de Sitter bulk a…
A general proof of the conservation of the curvature perturbation
David H. Lyth, Karim A. Malik, Misao Sasaki
Without invoking a perturbative expansion, we define the cosmological curvature perturbation, and consider its behaviour assuming that the universe is smooth over a sufficiently la…
Zeta Functions in Brane World Cosmology
Antonino Flachi, Alan Knapman, Wade Naylor +1
We present a calculation of the zeta function and of the functional determinant for a Laplace-type differential operator, corresponding to a scalar field in a higher dimensional de…
On Detection of Black Hole Quasi-Normal Ringdowns: Detection Efficiency and Waveform Parameter Determination in Matched Filtering
Yoshiki Tsunesada, Nobuyuki Kanda, Hiroyuki Nakano +5
Gravitational radiation from a slightly distorted black hole with ringdown waveform is well understood in general relativity. It provides a probe for direct observation of black ho…
A new analytical method for self-force regularization II. Testing the efficiency for circular orbits
Wataru Hikida, Sanjay Jhingan, Hiroyuki Nakano +3
In a previous paper, based on the black hole perturbation approach, we formulated a new analytical method for regularizing the self-force acting on a particle of small mass orb…
Reconstructing the Primordial Spectrum with CMB Temperature and Polarization
Noriyuki Kogo, Misao Sasaki, Jun'ichi Yokoyama
We develop a new method to reconstruct the power spectrum of primordial curvature perturbations, , by using both the temperature and polarization spectra of the cosmic microw…
Holography in Einstein Gauss-Bonnet Gravity
Sachiko Ogushi, Misao Sasaki
We investigate a holographic relation between Einstein Gauss-Bonnet gravity in dimensions and its dual field theory in () dimensions. We briefly review the AdS/CFT corresp…
Linearized gravity on the de Sitter brane in the Einstein Gauss-Bonnet theory
Masato Minamitsuji, Misao Sasaki
We investigate the linearized gravity on a single de Sitter brane in the anti-de Sitter (AdS) bulk in the Einstein Gauss-Bonnet (EGB) theory. We find that the Einstein gravity is r…
An Improved Search Method for Gravitational Ringing of Black Holes
Hiroyuki Nakano, Hirotaka Takahashi, Hideyuki Tagoshi +1
A black hole has characteristic quasi-normal modes that will be excited when it is formed or when the geometry is perturbed. The state of a black hole when the quasi-normal modes a…
A new calculation of the mass fraction of primordial black holes
Anne M. Green, Andrew R. Liddle, Karim A. Malik +1
We revisit the calculation of the abundance of primordial black holes (PBHs) formed from primordial density perturbations, using a formation criterion derived by Shibata and Sasaki…
Local conservation law and dark radiation in cosmological braneworld
Masato Minamitsuji, Misao Sasaki
In the context of the Randall-Sundrum (RS) single-brane scenario, we discuss the bulk geometry and dynamics of a cosmological brane in terms of the local energy conservation law wh…