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10 papers · 2 filters
Energy emission from high curvature region and its backreation
Takafumi Kokubu, Sanjay Jhingan, Tomohiro Harada
A strong gravity naked singular region can give important clues towards understanding classical as well as spontaneous nature of General Relativity. We propose here a model for ene…
The essence of the Blandford-Znajek process
Shunichiro Kinoshita, Takahisa Igata
From a spacetime perspective, the dynamics of magnetic field lines of force-free electromagnetic fields can be rewritten into a quite similar form for the dynamics of strings, i.e.…
Short-range test of the universality of gravitational constant at the millimeter scale using a digital image sensor
K. Ninomiya, T. Akiyama, M. Hata +19
The composition dependence of gravitational constant is measured at the millimeter scale to test the weak equivalence principle, which may be violated at short range through ne…
Extended mimetic gravity: Hamiltonian analysis and gradient instabilities
Kazufumi Takahashi, Tsutomu Kobayashi
We propose a novel class of degenerate higher-order scalar-tensor theories as an extension of mimetic gravity. By performing a noninvertible conformal transformation on "seed" scal…
On the stability of a superspinar
Ken-ichi Nakao, Pankaj S. Joshi, Jun-Qi Guo +5
The superspinar proposed by Gimon and Horava is a rapidly rotating compact entity whose exterior is described by the over-spinning Kerr geometry. The compact entity itself is expec…
Spins of primordial black holes formed in the matter-dominated phase of the Universe
Tomohiro Harada, Chul-Moon Yoo, Kazunori Kohri +1
Angular momentum plays very important roles in the formation of PBHs in the matter-dominated phase if it lasts sufficiently long. In fact, most collapsing masses are bounced back d…