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11 papers · 2 filters
On the number of terms in the Lovelock products
Xavier Lachaume
In this short note we wonder about the explicit expression of the expanding of the -th Lovelock product. We use the 1990's works of S. A. Fulling et al. on the symmetries of the…
Hairy Schwarzschild-(A)dS black hole solutions in DHOST theories beyond shift symmetry
Jibril Ben Achour, Hongguang Liu
We derive the general conditions for a large family of shift symmetry breaking degenerate higher order scalar-tensor (DHOST) theories to admit stealth black hole solutions. Such bl…
Shape dependence of spontaneous scalarization
Hayato Motohashi, Shinji Mukohyama
Spontaneous scalarization is an interesting mechanism for modification of gravity by nonminimal coupling of a scalar field to matter or curvature invariants in the context of scala…
Asymptotic analysis of spin foam amplitude with timelike triangles
Hongguang Liu, Muxin Han
The large asymptotic behavior of -dimensional spin foam amplitude is investigated for the extended spin foam model (Conrady-Hnybida extension) on a simplicial complex. We st…
Phenomenology in type-I minimally modified gravity
Katsuki Aoki, Antonio De Felice, Chunshan Lin +2
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: th…
Inflationary models that generalize the constant roll constraint
B. Boisseau, H. Giacomini
Recently a class of inflationary models satisfying the constant rate of roll constraint, , has been studied and compared with the latest cosmological observat…