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Anisotropies of gravitational-wave standard sirens as a new cosmological probe without redshift information
Toshiya Namikawa, Atsushi Nishizawa, Atsushi Taruya
Gravitational waves (GWs) from compact binary stars at cosmological distances are promising and powerful cosmological probes, referred to as the GW standard sirens. With future GW…
Universally Valid Error-Disturbance Relations in Continuous Measurements
Atsushi Nishizawa, Yanbei Chen
In quantum physics, measurement error and disturbance were first naively thought to be simply constrained by the Heisenberg uncertainty relation. Later, more rigorous analysis show…
Weak value amplification and beyond the standard quantum limit in position measurements
Atsushi Nishizawa
In a weak measurement with post-selection, a measurement value, called the weak value, can be amplified beyond the eigenvalues of the observable. However, there are some controvers…
Search for an emission line of a gravitational wave background
Atsushi Nishizawa, Naoki Seto
In the light of the history of researches on electromagnetic wave spectrum, a sharp emission line of gravitational-wave background (GWB) would be an interesting observational targe…