2 papers
astro-ph.CO2026
NANOGrav 15-year gravitational-wave signals from binary supermassive black-holes seeded by primordial black holes, and implications for the origins of Little Red Dots
Mikage U. Kobayashi, Kazunori Kohri
In this paper, we explain the recently reported a nHz-band gravitational-wave background from NANOGrav 15-year through the merger of binary super-massive black holes with masses of…
astro-ph.CO2026
Blue-tilted Runnings and the JWST Early Galaxy Tension
Mikage U. Kobayashi, Gen Chiaki, Kazutaka Kimura +4
The recent James Webb Space Telescope (JWST) observations reported the unexpectedly large abundance of massive galaxies with stellar masses of at high reds…