214 citations · 1.6k across the 81 of their papers we have counts for
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Gravitational entanglement witness through Einstein ring image
Youka Kaku, Yasusada Nambu
We investigate the interplay between quantum theory and gravity by exploring gravitational lensing and Einstein ring images in a weak gravitational field induced by a mass source i…
Hawking radiation in quantum Hall system with an expanding edge: application of anomaly method
Riku Yoshimoto, Yasusada Nambu
The relationship between gravitational anomalies and Hawking radiation of black holes was revealed by Wilczek and Robinson. In this study, we apply their method to an analogue de S…
Second-Order Coherence as an Indicator of Quantum Entanglement of Hawking Radiation in Moving-Mirror Models
Masanori Tomonaga, Yasusada Nambu
The second-order coherence of light is a widely recognized physical quantity used to assess the quantum characteristics of light, and its properties have been extensively investiga…
Stochastic inflation and entropy bound in de Sitter spacetime
Hiromasa Tajima, Yasusada Nambu
We investigate the entropy dynamics of de Sitter spacetime during the inflationary phase. The cosmological horizon in de Sitter spacetime, which limits the causally accessible regi…
The final burst of the moving mirror is unrelated to the partner mode of analog Hawking radiation
Yuki Osawa, Kuan-Nan Lin, Yasusada Nambu +2
Flying mirrors with appropriate trajectories have been recognized as an analog system that mimics black hole Hawking evaporation and have been widely investigated. It has recently…
Large violation of Leggett-Garg inequalities with coherent-state projectors for a harmonic oscillator and chiral scalar field
Tomoya Hirotani, Akira Matsumura, Yasusada Nambu +1
We investigate violations of Leggett-Garg inequalities (LGIs) for a harmonic oscillator and a (1+1)-dimensional chiral scalar field with coherent-state projectors, which is equival…