530 citations · 2k across the 27 of their papers we have counts for
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Instabilities in tensorial nonlocal gravity
Henrik Nersisyan, Yashar Akrami, Luca Amendola +3
We discuss the cosmological implications of nonlocal modifications of general relativity containing tensorial structures. Assuming the presence of standard radiation- and matter-do…
Cosmology Beyond Einstein
Adam R. Solomon
The accelerating expansion of the Universe poses a major challenge to our understanding of fundamental physics. One promising avenue is to modify general relativity and obtain a ne…
Bimetric gravity is cosmologically viable
Yashar Akrami, S. F. Hassan, Frank Könnig +2
Bimetric theory describes gravitational interactions in the presence of an extra spin-2 field. Previous work has suggested that its cosmological solutions are generically plagued b…
The nature of spacetime in bigravity: two metrics or none?
Yashar Akrami, Tomi S. Koivisto, Adam R. Solomon
The possibility of matter coupling to two metrics at once is considered. This appears natural in the most general ghost-free, bimetric theory of gravity, where it unlocks an additi…