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Measurement of Hubble constant with stellar-mass binary black holes
Atsushi Nishizawa
The direct detections of gravitational waves (GW) from merging binary black holes (BBH) by aLIGO have brought us a new opportunity to utilize BBH for a measurement of the Hubble co…
Gravitational Wave Memory: A New Approach to Study Modified Gravity
Song Ming Du, Atsushi Nishizawa
It is well known that two types of gravitational wave memory exist in general relativity (GR): the linear memory and the non-linear, or Christodoulou memory. These effects, especia…
A New Milky Way Satellite Discovered In The Subaru/Hyper Suprime-Cam Survey
Daisuke Homma, Masashi Chiba, Sakurako Okamoto +16
We report the discovery of a new ultra-faint dwarf satellite companion of the Milky Way based on the early survey data from the Hyper Suprime-Cam Subaru Strategic Program. This new…
Constraining stellar binary black hole formation scenarios with eLISA eccentricity measurements
Atsushi Nishizawa, Alberto Sesana, Emanuele Berti +1
A space-based interferometer such as eLISA could observe few to few thousands progenitors of black hole binaries (BHBs) similar to those recently detected by Advanced LIGO. Gravita…
Testing Gravity with Pulsar Scintillation Measurements
Huan Yang, Atsushi Nishizawa, Ue-Li Pen
We propose to use pulsar scintillation measurements to test predictions of alternative theories of gravity. Comparing to single-path pulsar timing measurements, the scintillation m…
eLISA eccentricity measurements as tracers of binary black hole formation
Atsushi Nishizawa, Emanuele Berti, Antoine Klein +1
Up to hundreds of black hole binaries individually resolvable by eLISA will coalesce in the Advanced LIGO/Virgo band within ten years, allowing for multi-band gravitational wave ob…