155 citations · 428 across the 5 of their papers we have counts for
5 papers
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…
Integrated Sachs-Wolfe effect in massive bigravity
Jonas Enander, Yashar Akrami, Edvard Mortsell +2
We study the integrated Sachs-Wolfe (ISW) effect in ghost-free, massive bigravity. We focus on the infinite-branch bigravity (IBB) model which exhibits viable cosmic expansion hist…
Cosmic expansion histories in massive bigravity with symmetric matter coupling
Jonas Enander, Adam R. Solomon, Yashar Akrami +1
We study the cosmic expansion history of massive bigravity with a viable matter coupling which treats both metrics on equal footing. We derive the Friedmann equation for the effect…
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…
Power asymmetry in WMAP and Planck temperature sky maps as measured by a local variance estimator
Y. Akrami, Y. Fantaye, A. Shafieloo +4
We revisit the question of hemispherical power asymmetry in the WMAP and Planck temperature sky maps by measuring the local variance over the sky and on disks of various sizes. For…