117 citations · 1k across the 40 of their papers we have counts for
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gr-qc2022★ 13 cited
No Smooth Spacetime in Lorentzian Quantum Cosmology and Trans-Planckian Physics
Hiroki Matsui, Shinji Mukohyama, Atsushi Naruko
In minisuperspace quantum cosmology, the Lorentzian path integral formulations of the no-boundary and tunneling proposals have recently been analyzed. But it has been pointed out t…
gr-qc2022★ 18 cited
Ostrogradsky mode in scalar-tensor theories with higher-order derivative couplings to matter
Atsushi Naruko, Ryo Saito, Norihiro Tanahashi +1
A metric transformation is a tool to find a new theory of gravity beyond general relativity. The gravity action is guaranteed to be free from a dangerous Ostrogradsky mode as long…