1k citations · 1.3k across the 28 of their papers we have counts for
14 papers · 1 filter
Cosmic Microwave Background Anisotropy numerical solution (CMBAns) I: An introduction to calculation
Santanu Das, Anh Phan
Cosmological Boltzmann codes are often used by researchers for calculating the CMB angular power spectra from different theoretical models, for cosmological parameter estimation, e…
Joint Bayesian analysis of large angular scale CMB temperature anomalies
Shabbir Shaikh, Suvodip Mukherjee, Santanu Das +2
Cosmic microwave background measurements show an agreement with the concordance cosmology model except for a few notable anomalies: Power Suppression, the lack of large scale power…
SIToolBox : A package for Bayesian estimation of the isotropy violation in the CMB sky
Santanu Das
The standard model of cosmology predicts a statistically isotropic (SI) CMB sky. However, the SI violation signals are always present in an observed sky-map. Different cosmological…
Estimating SI violation in CMB due to non-circular beam and complex scan in minutes
Nidhi Pant, Santanu Das, Aditya Rotti +2
Mild, unavoidable deviations from circular-symmetry of instrumental beams along with scan strategy can give rise to measurable Statistical Isotropy (SI) violation in Cosmic Microwa…
Bayesian inference on the sphere beyond statistical isotropy
Santanu Das, Benjamin D. Wandelt, Tarun Souradeep
We present a general method for Bayesian inference of the underlying covariance structure of random fields on a sphere. We employ the Bipolar Spherical Harmonic (BipoSH) representa…
Effect of noncircularity of experimental beam on CMB parameter estimation
Santanu Das, Sanjit Mitra, Sonu Tabitha Paulson
Measurement of Cosmic Microwave Background (CMB) anisotropies has been playing a lead role in precision cosmology by providing some of the tightest constrains on cosmological model…
Estimation of Inflation parameters for Perturbed Power Law model using recent CMB measurements
Suvodip Mukherjee, Santanu Das, Minu Joy +1
Cosmic Microwave Background (CMB) is an important probe for understanding the inflationary era of the Universe. We consider the Perturbed Power Law (PPL) model of inflation which i…
Revised cosmological parameters after BICEP 2 and BOSS
Santanu Das, Suvodip Mukherjee, Tarun Souradeep
Estimation of parameters of the \lq standard\rq \,model of cosmology have dramatically improved over past few decades due to increasingly exquisite measurements made by Cosmic Micr…
SCoPE: An efficient method of Cosmological Parameter Estimation
Santanu Das, Tarun Souradeep
Markov Chain Monte Carlo (MCMC) sampler is widely used for cosmological parameter estimation from CMB and other data. However, due to the intrinsic serial nature of the MCMC sample…
Statistical isotropy violation in WMAP CMB maps resulting from non-circular beams
Santanu Das, Sanjit Mitra, Aditya Rotti +2
Statistical isotropy (SI) of Cosmic Microwave Background (CMB) fluctuations is a key observational test to validate the cosmological principle underlying the standard model of cosm…
Suppressing CMB low multipoles with ISW effect
Santanu Das, Tarun Souradeep
Recent results of Planck data reveal that the power in the low multipoles of the CMB angular power spectrum, approximately up to , is significantly lower than the theoretical…
Leakage of power from dipole to higher multipoles due to non-symmetric WMAP beam
Santanu Das, Tarun Souradeep
A number of studies of WMAP and Planck claimed the low multipole (specially quadrupole) power deficiency in CMB power spectrum. Anomaly in the orientations of the low multipoles ha…
Revealing Non-circular beam effect in WMAP-7 CMB maps with BipoSH measures of Statistical Isotropy
Nidhi Joshi, Santanu Das, Aditya Rotti +2
Mild, unavoidable deviations from circular-symmetry of instrumental beams in current Cosmic Microwave Background (CMB) experiments now pose a significant challenge to deriving high…
Dipole leakage and low CMB multipoles
Santanu Das, Tarun Souradeep
A number of studies of WMAP-7 have highlighted that the power at the low multipoles in CMB power spectrum are lower than their theoretically predicted values. Angular correlation b…