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5 papers · 1 filter
Precision calculations of the gravitational wave background spectrum from inflation
Sachiko Kuroyanagi, Takeshi Chiba, Naoshi Sugiyama
The spectrum of the gravitational wave background originating from quantum fluctuations during inflation is calculated numerically for various inflation models over a wide range of…
Status of GRB Observations with the Suzaku Wideband All-sky Monitor
M. S. Tashiro, Y. Terada, Y. Urata +28
The Wide-band All-sky Monitor (WAM) is a function of the large lateral BGO shield of the Hard X-ray Detector (HXD) onboard Suzaku. Its large geometrical area of 800 cm^2 per side,…
A Null Test of the Cosmological Constant
Takeshi Chiba, Takashi Nakamura
We provide a consistency relation between cosmological observables in general relativity with the cosmological constant. Breaking of this relation at any redshift would imply the b…
A Consistency Relation in Cosmology
Takeshi Chiba, Ryuichi Takahashi
We provide a consistency relation between cosmological observables in general relativity without relying on the equation of state of dark energy. The consistency relation should be…
Solar System constraints to general f(R) gravity
Takeshi Chiba, Tristan L. Smith, Adrienne L. Erickcek
It has been proposed that cosmic acceleration or inflation can be driven by replacing the Einstein-Hilbert action of general relativity with a function f(R) of the Ricci scalar R.…