77 citations · 186 across the 6 of their papers we have counts for
6 papers
A Direct Probe of the Evolutionary History of the Primordial Universe
Xingang Chen, Mohammad Hossein Namjoo, Yi Wang
Since Hubble and Lamaitre's discovery of the expanding universe using galaxies till the recent discovery of the accelerating universe using standard candles, direct measurements of…
Expected dipole asymmetry in CMB polarization
M. H. Namjoo, A. A. Abolhasani, H. Assadullahi +3
We explore the hemispherical asymmetry predicted in cosmic microwave background polarization when there is an asymmetry in temperature anisotropies due to primordial perturbations.…
CMB hemispherical asymmetry from non-linear isocurvature perturbations
Hooshyar Assadullahi, Hassan Firouzjahi, Mohammad Hossein Namjoo +1
We investigate whether non-adiabatic perturbations from inflation could produce an asymmetric distribution of temperature anisotropies on large angular scales in the cosmic microwa…
CMB Hemispherical Asymmetry: Long Mode Modulation and non-Gaussianity
Mohammad Hossein Namjoo, Ali Akbar Abolhasani, Shant Baghram +1
The observed hemispherical asymmetry in CMB map can be explained by modulation from a long wavelength super horizon mode which non-linearly couples to the CMB modes. We address the…
Jump in fluid properties of inflationary universe to reconcile scalar and tensor spectra
Hassan Firouzjahi, Mohammad Hossein Namjoo
The recent detection of the primordial gravitational waves from the BICEP2 observation seems to be in tension with the upper bound on the amplitude of tensor perturbations from the…
Standard Clock in Primordial Density Perturbations and Cosmic Microwave Background
Xingang Chen, Mohammad Hossein Namjoo
Standard Clocks in the primordial epoch leave a special type of features in the primordial perturbations, which can be used to directly measure the scale factor of the primordial u…