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10 papers · 2 filters
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.…
Models of the Primordial Standard Clock
Xingang Chen, Mohammad Hossein Namjoo, Yi Wang
Oscillating massive fields in the primordial universe can be used as Standard Clocks. The ticks of these oscillations induce features in the density perturbations, which directly r…
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 statistical anisotropies of classical and quantum origins
Xingang Chen, Razieh Emami, Hassan Firouzjahi +1
We examine the impact of different anisotropic relics on inflation, in particular the predictions on the density perturbations. These relics can be the source of the large scale an…
Effect of inhomogeneities on high precision measurements of cosmological distances
Austin Peel, M. A. Troxel, Mustapha Ishak
We study effects of inhomogeneities on distance measures in an exact relativistic Swiss-cheese model of the universe, focusing on the distance modulus. The model has LCDM backgroun…
The Intrinsic Alignment of Galaxies and its Impact on Weak Gravitational Lensing in an Era of Precision Cosmology
M. A. Troxel, Mustapha Ishak
The wealth of incoming and future cosmological observations will allow us to map out the structure and evolution of the observable universe to an unprecedented level of precision.…
Fingerprints of Anomalous Primordial Universe on the Abundance of Large Scale Structures
Shant Baghram, Ali Akbar Abolhasani, Hassan Firouzjahi +1
We study the predictions of anomalous inflationary models on the abundance of structures in large scale structure observations. The anomalous features encoded in primordial curvatu…
The TT, TB, EB and BB correlations in anisotropic inflation
Xingang Chen, Razieh Emami, Hassan Firouzjahi +1
The ongoing and future experiments will measure the B-mode from different sky coverage and frequency bands, with the potential to reveal non-trivial features in polarization map. I…
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…
Cross-correlation between cosmic microwave background lensing and galaxy intrinsic alignment as a contaminant to gravitational lensing cross-correlated probes of the universe
M. A. Troxel, Mustapha Ishak
We introduce here a cross-correlation term between CMB lensing and galaxy intrinsic alignment, noted hereby as . This effect acts as a contaminant to the cross-correlation betw…