530 citations · 2k across the 27 of their papers we have counts for
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Cosmological viability of massive gravity with generalized matter coupling
Adam R. Solomon, Jonas Enander, Yashar Akrami +3
There is a no-go theorem forbidding flat and closed FLRW solutions in massive gravity on a flat reference metric, while open solutions are unstable. Recently it was shown that this…
Inflationary power asymmetry from primordial domain walls
Sadra Jazayeri, Yashar Akrami, Hassan Firouzjahi +2
We study the asymmetric primordial fluctuations in a model of inflation in which translational invariance is broken by a domain wall. We calculate the corrections to the power spec…
Stable and unstable cosmological models in bimetric massive gravity
Frank Könnig, Yashar Akrami, Luca Amendola +2
Nonlinear, ghost-free massive gravity has two tensor fields; when both are dynamical, the mass of the graviton can lead to cosmic acceleration that agrees with background data, eve…
Linear growth of structure in massive bigravity
Adam R. Solomon, Yashar Akrami, Tomi S. Koivisto
The ghost-free theory of massive gravity with two dynamical metrics has been shown to produce viable cosmological expansion, where the late-time acceleration of the Universe is due…
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…