437 citations · 6k across the 146 of their papers we have counts for
26 papers · 1 filter
Observational Evidence for Cosmological-Scale Extra Dimensions
Niayesh Afshordi, Ghazal Geshnizjani, Justin Khoury
We present a case that current observations may already indicate new gravitational physics on cosmological scales. The excess of power seen in the Lyman-alpha forest and small-scal…
Hierarchical Phase Space Structure of Dark Matter Haloes: Tidal debris, Caustics, and Dark Matter annihilation
Niayesh Afshordi, Roya Mohayaee, Edmund Bertschinger
Most of the mass content of dark matter haloes is expected to be in the form of tidal debris. The density of debris is not constant, but rather can grow due to formation of caustic…
Extended Limber Approximation
Marilena LoVerde, Niayesh Afshordi
We develop a systematic derivation for the Limber approximation to the angular cross-power spectrum of two random fields, as a series expansion in 1/(\ell+1/2). This extended Limbe…
Gravitational Aether and the thermodynamic solution to the cosmological constant problem
Niayesh Afshordi
Cosmological constant problem (in its various versions) is arguably the deepest gap in our understanding of theoretical physics, the solution to which may very likely require revis…
Primordial non-gaussianity, statistics of collapsed objects, and the Integrated Sachs-Wolfe effect
Niayesh Afshordi, Andrew J. Tolley
Any hint of non-gaussianity in the cosmological initial conditions will provide us with a unique window into the physics of early universe. We show that the impact of a small local…
Does Planck mass run on the cosmological horizon scale?
Georg Robbers, Niayesh Afshordi, Michael Doran
Einstein's theory of general relativity, which contains a universal value of the Planck mass, has been so far successfully invoked to explain gravitational dynamics from sub-millim…