179 citations · 1.2k across the 42 of their papers we have counts for
7 papers · 1 filter
Cosmological gravity probes: connecting recent theoretical developments to forthcoming observations
Shun Arai, Katsuki Aoki, Yuji Chinone +20
Since the discovery of the accelerated expansion of the present Universe, significant theoretical developments have been made in the area of modified gravity. In the meantime, cosm…
Some disquisitions on cosmological 2-form dualities
Katsuki Aoki, Jose Beltrán Jiménez, David Figueruelo
In this work we study different aspect of self-interacting 2-form fields with special emphasis in their cosmological applications. We provide the explicit construction of how massl…
Highly compact Proca stars with quartic self-interactions
Katsuki Aoki, Masato Minamitsuji
We study self-gravitating bound states of a complex vector field, known as Proca stars, with a new type of quartic-order self-interaction which does not exist in the case of either…
Unitarity and unstable-particle scattering amplitudes
Katsuki Aoki
Unitarity is the fundamental property of the S-matrix while its usage for a scattering of unstable particles has been subtle as unstable particles do not appear in the asymptotic s…
Spin-2 dark matter from anisotropic Universe in bigravity
Yusuke Manita, Katsuki Aoki, Tomohiro Fujita +1
Bigravity is one of the natural extensions of general relativity and contains an additional massive spin-2 field which can be a good candidate for dark matter. To discuss the produ…
Resolving the pathologies of self-interacting Proca fields: A case study of Proca stars
Katsuki Aoki, Masato Minamitsuji
It has been argued that a self-interacting massive vector field is pathological due to a dynamical formation of a singular effective metric of the vector field, which is the onset…