16 citations · 30 across the 7 of their papers we have counts for
7 papers
Primordial black hole formation in matter domination
Ehsan Ebrahimian, Ali Akbar Abolhasani, Mehrdad Mirbabayi
We study Primordial Black Holes (PBHs) formed by the collapse of rare primordial fluctuations during an early period of Matter Domination. The collapse threshold strongly depends o…
Nearest neighbour analysis as a new probe for fuzzy dark matter
Hamed Manouchehri Kousha, Mohammad Ansarifard, Aliakbar Abolhasani
Fuzzy dark matter (FDM) is a promising candidate for dark matter, characterized by its ultra-light mass, which gives rise to wave effects at astrophysical scales. These effects off…
The Effective Field Theory of Large Scale Structures of a Fuzzy Dark Matter Universe
Hamed Manouchehri Kousha, Sina Hooshangi, Aliakbar Abolhasani
Ultra-light scalar fields and their non-interacting class, the so-called fuzzy dark matter (FDM), are candidates for dark matter, introduced to solve the small-scale problems of th…
Derivative Interactions during Inflation: A Systematic Approach
Aliakbar Abolhasani, Harry Goodhew
We present a systematic prescription for calculating cosmological correlation functions for models with derivative interactions through the wavefunction of the universe and compare…
Spin Alignment of Dark Matter Halos: Mad Halos
E. Ebrahimian, A. A. Abolhasani
We investigate the spin alignment of the dark matter halos by considering a mechanism somewhat similar to tidal locking. We dubbed it Tidal Locking Theory (TLT). While Tidal Torque…
Observable Quantum Loop Effects in the Sky
A. A. Abolhasani, M. M. Sheikh-Jabbari
Expanding on [1], we analyze in detail the single field chaotic inflationary models plus a cosine modulation term, augmented by a light scalar field with inflaton dependent oscilla…
\bf Formalism: A New Approach to Cosmological Perturbation Theory in Anisotropic Inflation
Alireza Talebian-Ashkezari, Nahid Ahmadi, Ali Akbar Abolhasani
We study the evolution of the metric perturbations in a Bianchi background in the long-wavelength limit. By applying the gradient expansion to the equations of motion we exhibit a…