Model independent foreground power spectrum estimation using WMAP 5-year data (2009)
Ghosh, Tuhin, Saha, Rajib, Jain, Pankaj, Souradeep, Tarun
In this paper, we propose and implement on WMAP 5 yr data a model independent approach of foreground power spectrum estimation for multifrequency observations of the CMB experiments. Recently, a...
Signals of statistical anisotropy in WMAP foreground-cleaned maps (2009)
Samal, Pramoda Kumar, Saha, Rajib, Jain, Pankaj, Ralston, John P.
Recently, a symmetry-based method to test for statistical isotropy of the cosmic microwave background was developed. We apply the method to template-cleaned 3- and 5-years Wilkinson Microwave...
Mitra, Sanjit, Sengupta, Anand S., Ray, Subharthi, Saha, Rajib, Souradeep, Tarun
Over the last decade, measurements of the cosmic microwave background (CMB) anisotropy have spearheaded the remarkable transition of cosmology into a precision science. However, addressing the...
Samal, Pramoda Kumar, Saha, Rajib, Delabrouille, Jacques, Prunet, Simon, Jain, Pankaj, Souradeep, Tarun
We estimate CMB polarization and temperature power spectra using WMAP 5-year foreground contaminated maps. The power spectrum is estimated by using a model independent method, which does not utilize...
Model Independent Foreground Power Spectrum Estimation using WMAP 5-year Data (2009)
Ghosh, Tuhin, Saha, Rajib, Jain, Pankaj, Souradeep, Tarun
In this paper, we propose & implement on WMAP 5-year data, a model independent approach of foreground power spectrum estimation for multifrequency observations of CMB experiments. Recently a model...
Lee, Dong-Yup, Saha, Rajib, Yusufi, Faraaz Noor Khan, Park, Wonjun, Karimi, Iftekhar A.
Mathematical modelling and computational analysis play an essential role in improving our capability to elucidate the functions and characteristics of complex biological systems such as metabolic,...
Signals of Statistical Anisotropy in WMAP Foreground-Cleaned Maps (2008)
Samal, Pramoda Kumar, Saha, Rajib, Jain, Pankaj, Ralston, John P.
Recently a symmetry-based method to test for statistical isotropy of the cosmic microwave background was developed. We apply the method to template-cleaned 3-year and 5-year WMAP-$DA$ maps. We...
Testing Isotropy of Cosmic Microwave Background Radiation (2007)
Samal, Pramoda Kumar, Saha, Rajib, Jain, Pankaj, Ralston, John P.
We introduce new symmetry-based methods to test for isotropy in cosmic microwave background radiation. Each angular multipole is factored into unique products of power eigenvectors, related...
CMB anisotropy power spectrum using linear combinations of WMAP maps (2007)
Saha, Rajib, Prunet, Simon, Jain, Pankaj, Souradeep, Tarun
In recent years the goal of estimating different cosmological parameters precisely has set new challenges in the effort to accurately measure the angular power spectrum of CMB. This has required...
CMB power spectrum estimation with non-circular beam and incomplete sky coverage (2007)
Mitra, Sanjit, Sengupta, Anand S., Ray, Subharthi, Saha, Rajib, Souradeep, Tarun
Over the last decade, measurements of the CMB anisotropy has spearheaded the remarkable transition of cosmology into a precision science. However, addressing the systematic effects in the...
Non-Circular beam correction to the CMB power spectrum (2006)
Souradeep, Tarun, Mitra, Sanjit, Sengupta, Anand, Ray, Subharthi, Saha, Rajib
In the era of high precision CMB measurements, systematic effects are beginning to limit the ability to extract subtler cosmological information. The non-circularity of the experimental beam has...
Angular power spectrum of CMB anisotropy from WMAP (2006)
Souradeep, Tarun, Saha, Rajib, Jain, Pankaj
The remarkable improvement in the estimates of different cosmological parameters in recent years has been largely spearheaded by accurate measurements of the angular power spectrum of Cosmic...
A blind estimation of the power spectrum of CMB anisotropy from WMAP (2005)
Saha, Rajib, Jain, Pankaj, Souradeep, Tarun
Accurate measurements of angular power spectrum of Cosmic Microwave Background (CMB) radiation has lead to marked improvement in the estimates of different cosmological parameters. This has required...
The Dynamical Mixing of Light and Pseudoscalar Fields (2004)
Das, Sudeep, Jain, Pankaj, Ralston, John P., Saha, Rajib
We solve the general problem of mixing of electromagnetic and scalar or pseudoscalar fields coupled by axion-type interactions ${\cal L}_{int} =g_{\phi} \phi \epsilon_{\mu \nu \a \b}F^{\mu \nu}F^{\a...
Probing Light Pseudoscalars with Light: Propagation, Resonance and Spontaneous Polarization (2004)
Das, Sudeep, Jain, Pankaj, Ralston, John P., Saha, Rajib
Radiation propagating over cosmological distances can probe light weakly interacting pseudoscalar (or scalar) particles. The existence of a spin-0 field changes the dynamical symmetries of...