K. Ganga
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View article: The Simons Observatory: validation of reconstructed power spectra from simulated filtered maps for the small aperture telescope survey
The Simons Observatory: validation of reconstructed power spectra from simulated filtered maps for the small aperture telescope survey Open
We present a transfer function-based method to estimate angular power spectra from filtered maps for cosmic microwave background (CMB) surveys. This is especially relevant for experiments targeting the faint primordial gravitational wave s…
View article: The Simons Observatory: Validation of reconstructed power spectra from simulated filtered maps for the Small Aperture Telescope survey
The Simons Observatory: Validation of reconstructed power spectra from simulated filtered maps for the Small Aperture Telescope survey Open
We present a transfer function-based method to estimate angular power spectra from filtered maps for cosmic microwave background (CMB) surveys. This is especially relevant for experiments targeting the faint primordial gravitational wave s…
View article: The Relational Dynamics of Space-Time
The Relational Dynamics of Space-Time Open
The Relational Dynamics of Space-Time is a groundbreaking theory that redefines space-time as an emergent and discrete structure, arising from fundamental interactions between elementary entities. Rooted in the principle that “nothing is e…
View article: Spectral Imaging with QUBIC: building astrophysical components from Time-Ordered-Data using Bolometric Interferometry
Spectral Imaging with QUBIC: building astrophysical components from Time-Ordered-Data using Bolometric Interferometry Open
The detection of B-modes in the CMB polarization pattern is a major issue in modern cosmology and must therefore be handled with analytical methods that produce reliable results. We describe a method that uses the frequency dependency of t…
View article: Spectral Imaging with QUBIC: building frequency maps from Time-Ordered-Data using Bolometric Interferometry
Spectral Imaging with QUBIC: building frequency maps from Time-Ordered-Data using Bolometric Interferometry Open
The search for relics from the inflation era in the form of B-mode polarization of the CMB is a major challenge in cosmology. The main obstacle appears to come from the complexity of Galactic foregrounds that need to be removed. Multi-freq…
View article: The LiteBIRD mission to explore cosmic inflation
The LiteBIRD mission to explore cosmic inflation Open
LiteBIRD, the next-generation cosmic microwave background (CMB) experiment, aims for a launch in Japan's fiscal year 2032, marking a major advancement in the exploration of primordial cosmology and fundamental physics. Orbiting the Sun-Ear…
View article: In-flight performance of SPIDER's 280 GHz receivers
In-flight performance of SPIDER's 280 GHz receivers Open
SPIDER is a balloon-borne instrument designed to map the cosmic microwave background at degree-angular scales in the presence of Galactic foregrounds. Spider has mapped a large sky area in the Southern Hemisphere using more than 2000 trans…
View article: Analysis of Polarized Dust Emission Using Data from the First Flight of SPIDER
Analysis of Polarized Dust Emission Using Data from the First Flight of SPIDER Open
Using data from the first flight of SPIDER and from Planck HFI, we probe the properties of polarized emission from interstellar dust in the SPIDER observing region. Component separation algorithms operating in both the spatial and harmonic…
View article: Simons Observatory: observatory scheduler and automated data processing
Simons Observatory: observatory scheduler and automated data processing Open
The Simons Observatory (SO) is a next-generation ground-based telescope located in the Atacama Desert in Chile, designed to map the cosmic microwave background (CMB) with unprecedented precision. The observatory consists of three small ape…
View article: The Simons Observatory: Beam Characterization for the Small Aperture Telescopes
The Simons Observatory: Beam Characterization for the Small Aperture Telescopes Open
We use time-domain simulations of Jupiter observations to test and develop a beam reconstruction pipeline for the Simons Observatory Small Aperture Telescopes. The method relies on a mapmaker that estimates and subtracts correlated atmosph…
View article: Probing Cosmic Inflation with the LiteBIRD Cosmic Microwave Background Polarization Survey
Probing Cosmic Inflation with the LiteBIRD Cosmic Microwave Background Polarization Survey Open
LiteBIRD the Lite (Light) satellite for the study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission for primordial cos- mology and fundamental physics. The Japan Aerospace Exploration Agenc…
View article: Probing cosmic inflation with the<i>LiteBIRD</i>cosmic microwave background polarization survey
Probing cosmic inflation with the<i>LiteBIRD</i>cosmic microwave background polarization survey Open
LiteBIRD, the Lite (Light) satellite for the study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission for primordial cosmology and fundamental physics. The Japan Aerospace Exploration Agency…
View article: Status of QUBIC, the Q&U Bolometer for Cosmology
Status of QUBIC, the Q&U Bolometer for Cosmology Open
The Q&U Bolometric Interferometer for Cosmology (QUBIC) is a novel kind of polarimeter optimized for the measurement of the B-mode polarization of the Cosmic Microwave Back-ground (CMB), which is one of the major challenges of observationa…
View article: QUBIC II: Spectral polarimetry with bolometric interferometry
QUBIC II: Spectral polarimetry with bolometric interferometry Open
Bolometric interferometry is a novel technique that has the ability to perform spectral imaging. A bolometric interferometer observes the sky in a wide frequency band and can reconstruct sky maps in several sub-bands within the physical ba…
View article: QUBIC IV: Performance of TES bolometers and readout electronics
QUBIC IV: Performance of TES bolometers and readout electronics Open
A prototype version of the Q & U bolometric interferometer for cosmology (QUBIC) underwent a campaign of testing in the laboratory at Astroparticle Physics and Cosmology laboratory in Paris (APC). The detection chain is currently made of 2…
View article: QUBIC VIII: Optical design and performance
QUBIC VIII: Optical design and performance Open
The Q and U Bolometric Interferometer for Cosmology (QUBIC) is a ground-based experiment that aims to detect B-mode polarization anisotropies [1] in the CMB at angular scales around the ℓ ≃100 recombination peak. Systematic errors make gro…
View article: QUBIC VI: Cryogenic half wave plate rotator, design and performance
QUBIC VI: Cryogenic half wave plate rotator, design and performance Open
Setting an upper limit or detection of B-mode polarization imprinted by gravitational waves from Inflation is one goal of modern large angular scale cosmic microwave background (CMB) experiments around the world. A great effort is being ma…
View article: QUBIC III: Laboratory characterization
QUBIC III: Laboratory characterization Open
We report on an extensive test campaign of a prototype version of the QUBIC (Q & U Bolometric Interferometer for Cosmology) instrument, carried out at Astroparticle Physics and Cosmology (APC) in Paris. Exploiting the novel concept called …
View article: Polarization angle requirements for CMB B-mode experiments. Application to the LiteBIRD satellite
Polarization angle requirements for CMB B-mode experiments. Application to the LiteBIRD satellite Open
A methodology to provide the polarization angle requirements for different sets of detectors, at a given frequency of a CMB polarization experiment, is presented. The uncertainties in the polarization angle of each detector set are related…
View article: A Simulation-based Method for Correcting Mode Coupling in CMB Angular Power Spectra
A Simulation-based Method for Correcting Mode Coupling in CMB Angular Power Spectra Open
Modern cosmic microwave background (CMB) analysis pipelines regularly employ complex time-domain filters, beam models, masking, and other techniques during the production of sky maps and their corresponding angular power spectra. However, …
View article: A Constraint on Primordial B-modes from the First Flight of the Spider Balloon-borne Telescope
A Constraint on Primordial B-modes from the First Flight of the Spider Balloon-borne Telescope Open
We present the first linear polarization measurements from the 2015 long-duration balloon flight of Spider , which is an experiment that is designed to map the polarization of the cosmic microwave background (CMB) on degree angular scales.…
View article: Probing Cosmic Inflation with the LiteBIRD Cosmic Microwave Background\n Polarization Survey
Probing Cosmic Inflation with the LiteBIRD Cosmic Microwave Background\n Polarization Survey Open
LiteBIRD, the Lite (Light) satellite for the study of B-mode polarization and\nInflation from cosmic background Radiation Detection, is a space mission for\nprimordial cosmology and fundamental physics. The Japan Aerospace Exploration\nAge…
View article: CMB-S4: Forecasting Constraints on Primordial Gravitational Waves
CMB-S4: Forecasting Constraints on Primordial Gravitational Waves Open
CMB-S4—the next-generation ground-based cosmic microwave background (CMB) experiment—is set to significantly advance the sensitivity of CMB measurements and enhance our understanding of the origin and evolution of the universe. Among the s…
View article: Interplanetary Dust as a Foreground for the LiteBIRD CMB Satellite Mission
Interplanetary Dust as a Foreground for the LiteBIRD CMB Satellite Mission Open
As ever-more sensitive experiments are made in the quest for primordial CMB B Modes, the number of potentially significant astrophysical contaminants becomes larger as well. Thermal emission from interplanetary dust, for example, has been …
View article: A Simulation-Based Method for Correcting Mode Coupling in CMB Angular Power Spectra
A Simulation-Based Method for Correcting Mode Coupling in CMB Angular Power Spectra Open
Modern CMB analysis pipelines regularly employ complex time-domain filters, beam models, masking, and other techniques during the production of sky maps and their corresponding angular power spectra. However, these processes can generate c…
View article: The Hydrogen Intensity and Real-time Analysis eXperiment: 256-Element\n Array Status and Overview
The Hydrogen Intensity and Real-time Analysis eXperiment: 256-Element\n Array Status and Overview Open
The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) is a radio\ninterferometer array currently in development, with an initial 256-element\narray to be deployed at the South African Radio Astronomy Observatory (SARAO)\nSquare …
View article: <i>Planck</i> 2018 results
<i>Planck</i> 2018 results Open
In the original version, the bounds given in Eqs. (87a) and (87b) on the contribution to the early-time optical depth, (15,30), contained a numerical error in deriving the 95th percentile from the Monte Carlo samples. The corrected 95% upp…