Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Oliosi, Michele"'
We study even-parity black hole perturbations in Minimal Theory of Bigravity (MTBG). We consider the Schwarzschild solution written in the spatially-flat coordinates in the self-accelerating branch as the background solution. We clarify the gauge tra
Externí odkaz:
http://arxiv.org/abs/2407.01113
We investigate the possibility of reducing the number of degrees of freedom (d.o.f.) starting from generic metric theories of gravity by introducing multiple auxiliary constraints (ACs), under the restriction of retaining spatial covariance as a gaug
Externí odkaz:
http://arxiv.org/abs/2302.02090
Publikováno v:
Phys. Rev. D 107, 064070 (2023)
In the former part, we study the gravitational collapse of pressureless dust and find special solutions, where, in both the physical and fiducial sectors, the exterior and interior spacetime geometries are given by the Schwarzschild spacetimes and th
Externí odkaz:
http://arxiv.org/abs/2301.00498
We investigate static and spherically symmetric solutions in the Minimal Theory of Bigravity (MTBG). First, we show that a pair of Schwarzschild-de Sitter spacetimes with different cosmological constants and black hole masses written in the spatially
Externí odkaz:
http://arxiv.org/abs/2204.08217
Publikováno v:
JCAP04(2021)015
Following the path of minimalism in alternative theories of gravity, we construct the "Minimal Theory of Bigravity" (MTBG), a theory of two interacting spin-2 fields that propagates only four local degrees of freedom instead of the usual seven ones a
Externí odkaz:
http://arxiv.org/abs/2012.01073
Publikováno v:
Phys. Rev. D 103, 024032 (2021)
Working directly with a general Hamiltonian for the spacetime metric with the $3+1$ decomposition and keeping only the spatial covariance, we investigate the possibility of reducing the number of degrees of freedom by introducing an auxiliary constra
Externí odkaz:
http://arxiv.org/abs/2011.00805
Autor:
Aoki, Katsuki, De Felice, Antonio, Mukohyama, Shinji, Noui, Karim, Oliosi, Michele, Pookkillath, Masroor C.
Publikováno v:
Eur. Phys. J. C 80, 708 (2020)
We study the phenomenology of a class of minimally modified gravity theories called $f(\mathcal{H})$ theories, in which the usual general relativistic Hamiltonian constraint is replaced by a free function of it. After reviewing the construction of th
Externí odkaz:
http://arxiv.org/abs/2005.13972
Publikováno v:
JCAP 03 (2020) 002
The constant-roll inflation with small positive value of the constant-roll parameter $\beta\equiv \frac{\ddot\phi}{H\dot\phi}={\rm const.}$ has been known to produce a slightly red-tilted curvature power spectrum compatible with the current observati
Externí odkaz:
http://arxiv.org/abs/1910.13235
Publikováno v:
Phys. Rev. D 100, 124044 (2019)
This work investigates the possibility of achieving a conformally flat slicing of the Kerr spacetime. We consider a hypersurface of the form $t = F(r,\theta,a)$, where $(t,r,\theta,\phi)$ are the Boyer-Lindquist coordinates, solve for a vanishing Cot
Externí odkaz:
http://arxiv.org/abs/1908.03456
We study cosmology in a class of minimally modified gravity (MMG) with two local gravitational degrees of freedom. We classify modified gravity theories into type-I and type-II: theories of type-I have an Einstein frame and can be recast by change of
Externí odkaz:
http://arxiv.org/abs/1810.01047