283 citations · 1.4k across the 45 of their papers we have counts for
7 papers · 1 filter
In-in and calculations of the bispectrum from non-attractor single-field inflation
Xingang Chen, Hassan Firouzjahi, Eiichiro Komatsu +2
In non-attractor single-field inflation models producing a scale-invariant power spectrum, the curvature perturbation on super-horizon scales grows as . This i…
Asymmetric Sky from the Long Mode Modulations
Ali Akbar Abolhasani, Shant Baghram, Hassan Firouzjahi +1
The observed dipole asymmetry in Cosmic Microwave Background radiation may have originated from the modulations of super-horizon long wavelength modes. In this work we unveil diffe…
Fluid Inflation
Xingang Chen, Hassan Firouzjahi, Mohammad Hossein Namjoo +1
In this work we present an inflationary mechanism based on fluid dynamics. Starting with the action for a single barotropic perfect fluid, we outline the procedure to calculate the…
Cosmological Perturbations in Inflationary Models with Anisotropic Space-Time Scaling in Lifshitz Background
Mohsen Alishahiha, Hassan Firouzjahi, Kazuya Koyama +1
Models of inflation in a gravitational background with an anisotropic space-time scaling are studied. The background is a higher-dimensional Lifshitz throat with the anisotropy sca…
Hemispherical Asymmetry and Local non-Gaussianity: a Consistency Condition
Mohammad Hossein Namjoo, Shant Baghram, Hassan Firouzjahi
In this paper we provide a consistency relation between the amplitude of the hemispherical bipolar asymmetry, , and the amplitude of the primordial non-Gaussianity in the squeez…
Large Scale Anisotropic Bias from Primordial non-Gaussianity
Shant Baghram, Mohammad Hossein Namjoo, Hassan Firouzjahi
In this work we study the large scale structure bias in models of anisotropic inflation. We use the Peak Background Splitting method in Excursion Set Theory to find the scale-depen…
Modulated curvaton decay
Hooshyar Assadullahi, Hassan Firouzjahi, Mohammad Hossein Namjoo +1
We study primordial density perturbations generated by the late decay of a curvaton field whose decay rate may be modulated by the local value of another isocurvature field, analog…