Lionel Clermont
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View article: A simulation framework for the <i>LiteBIRD</i> instruments
A simulation framework for the <i>LiteBIRD</i> instruments Open
LiteBIRD , the Lite (Light) satellite for the study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission focused on primordial cosmology and fundamental physics. In this paper, we present the …
View article: LiteBIRD science goals and forecasts: improved full-sky reconstruction of the gravitational lensing potential through the combination of Planck and LiteBIRD data
LiteBIRD science goals and forecasts: improved full-sky reconstruction of the gravitational lensing potential through the combination of Planck and LiteBIRD data Open
Cosmic microwave background (CMB) photons are deflected by large-scale structure through gravitational lensing. This secondary effect introduces higher-order correlations in CMB anisotropies, which are used to reconstruct lensing deflectio…
View article: Requirements on bandpass resolution and measurement precision for LiteBIRD
Requirements on bandpass resolution and measurement precision for LiteBIRD Open
Systematic effects can hinder the sought-after detection of primordial gravitational waves, impacting the reconstruction of the B -mode polarization signal which they generate in the cosmic microwave background (CMB). In this work, we stud…
View article: LiteBIRD Science Goals and Forecasts. $E$-mode Anomalies
LiteBIRD Science Goals and Forecasts. $E$-mode Anomalies Open
Various so-called anomalies have been found in both the WMAP and Planck cosmic microwave background (CMB) temperature data that exert a mild tension against the highly successful best-fit 6 parameter cosmological model, potentially providi…
View article: Improved BRDF metrology platform for Copernicus CO2I FCU calibration
Improved BRDF metrology platform for Copernicus CO2I FCU calibration Open
editorial reviewed
View article: On-ground testing facility refinement for calibration of multiviewing, multichannel, multipolarisation imager (3MI) flight model 2
On-ground testing facility refinement for calibration of multiviewing, multichannel, multipolarisation imager (3MI) flight model 2 Open
editorial reviewed
View article: First release of LiteBIRD simulations from an end-to-end pipeline
First release of LiteBIRD simulations from an end-to-end pipeline Open
The LiteBIRD satellite mission aims at detecting Cosmic Microwave Background $B$ modes with unprecedented precision, targeting a total error on the tensor-to-scalar ratio $r$ of $δr \sim 0.001$. Operating from the L2 Lagrangian point of th…
View article: On the computational feasibility of Bayesian end-to-end analysis of LiteBIRD simulations within Cosmoglobe
On the computational feasibility of Bayesian end-to-end analysis of LiteBIRD simulations within Cosmoglobe Open
We assess the computational feasibility of end-to-end Bayesian analysis of the JAXA-led LiteBIRD experiment by analysing simulated time ordered data (TOD) for a subset of detectors through the Cosmoglobe and Commander3 framework. The data …
View article: LiteBIRD science goals and forecasts: constraining isotropic cosmic birefringence
LiteBIRD science goals and forecasts: constraining isotropic cosmic birefringence Open
Cosmic birefringence (CB) is the rotation of the photons' linear polarisation plane during propagation. Such an effect is a tracer of parity-violating extensions of standard electromagnetism and would probe the existence of a new cosmologi…
View article: Cost-effective BRDF spectroscopic bench involving gimbal-based sample positioning system
Cost-effective BRDF spectroscopic bench involving gimbal-based sample positioning system Open
editorial reviewed
View article: Requirements on the gain calibration for LiteBIRD polarisation data with blind component separation
Requirements on the gain calibration for LiteBIRD polarisation data with blind component separation Open
The detection of primordial B modes of the cosmic microwave background (CMB) could provide information about the early stages of the Universe's evolution. The faintness of this signal requires exquisite calibration accuracy and control of …
View article: Stray light correction method for telescopes with linear detector arrays in push-broom configuration: application to CO2M-CLIM
Stray light correction method for telescopes with linear detector arrays in push-broom configuration: application to CO2M-CLIM Open
peer reviewed
View article: Multi-dimensional optimisation of the scanning strategy for the LiteBIRD space mission
Multi-dimensional optimisation of the scanning strategy for the LiteBIRD space mission Open
Large angular scale surveys in the absence of atmosphere are essential for measuring the primordial B-mode power spectrum of the Cosmic Microwave Background (CMB). Since this proposed measurement is about three to four orders of magnitude …
View article: Requirements on the gain calibration for LiteBIRD polarisation data with blind component separation
Requirements on the gain calibration for LiteBIRD polarisation data with blind component separation Open
Future cosmic microwave background (CMB) experiments are primarily targeting a detection of the primordial $B$-mode polarisation. The faintness of this signal requires exquisite control of systematic effects which may bias the measurements…
View article: Using deep learning to improve stray light optical simulations in space telescopes
Using deep learning to improve stray light optical simulations in space telescopes Open
editorial reviewed
View article: The stray light baffle for the ARRAKIHS mission
The stray light baffle for the ARRAKIHS mission Open
editorial reviewed
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: Going beyond hardware limitations with advanced stray light calibration for the Metop-3MI space instrument
Going beyond hardware limitations with advanced stray light calibration for the Metop-3MI space instrument Open
View article: LiteBIRD Science Goals and Forecasts. Mapping the Hot Gas in the Universe
LiteBIRD Science Goals and Forecasts. Mapping the Hot Gas in the Universe Open
We assess the capabilities of the LiteBIRD mission to map the hot gas distribution in the Universe through the thermal Sunyaev-Zeldovich (SZ) effect. Our analysis relies on comprehensive simulations incorporating various sources of Galacti…
View article: Going beyond hardware limitations with advanced stray light calibration for the Metop-3MI space instrument
Going beyond hardware limitations with advanced stray light calibration for the Metop-3MI space instrument Open
Space optical instruments play a pivotal role in enhancing our understanding of the universe and our planet, and are crucial in addressing the urgent challenges posed by climate change. In this context, stray light has emerged as a primary…
View article: Impact of beam far side-lobe knowledge in the presence of foregrounds for LiteBIRD
Impact of beam far side-lobe knowledge in the presence of foregrounds for LiteBIRD Open
We present a study of the impact of a beam far side-lobe lack of knowledge on the measurement of the Cosmic Microwave Background B -mode signal at large scale. Beam far side-lobes induce a mismatch in the transfer function of Galactic fore…
View article: LiteBIRD science goals and forecasts: a full-sky measurement of gravitational lensing of the CMB
LiteBIRD science goals and forecasts: a full-sky measurement of gravitational lensing of the CMB Open
We explore the capability of measuring lensing signals in LiteBIRD full-sky polarization maps. With a 30 arcmin beam width and an impressively low polarization noise of 2.16 μ K-arcmin, LiteBIRD will be able to measure the full-sky polariz…
View article: Unlocking stray light mysteries in the CoRot baffle with the time-of-flight method
Unlocking stray light mysteries in the CoRot baffle with the time-of-flight method Open
Stray light (SL) has emerged as a primary limiting factor for space telescopes. Pre-launch testing is essential for validating performance and identifying potential issues. However, traditional methods do not enable the decomposition and i…
View article: Out-of-field stray light correction in optical instruments: the case of Metop-3MI
Out-of-field stray light correction in optical instruments: the case of Metop-3MI Open
peer reviewed
View article: Using deep learning for effective simulation of ghost reflections
Using deep learning for effective simulation of ghost reflections Open
peer reviewed
View article: Impact of beam far side-lobe knowledge in the presence of foregrounds for LiteBIRD
Impact of beam far side-lobe knowledge in the presence of foregrounds for LiteBIRD Open
We present a study of the impact of an uncertainty in the beam far side-lobe knowledge on the measurement of the Cosmic Microwave Background $B$-mode signal at large scale. It is expected to be one of the main source of systematic effects …
View article: LiteBIRD Science Goals and Forecasts: A full-sky measurement of gravitational lensing of the CMB
LiteBIRD Science Goals and Forecasts: A full-sky measurement of gravitational lensing of the CMB Open
We explore the capability of measuring lensing signals in $LiteBIRD$ full-sky polarization maps. With a $30$ arcmin beam width and an impressively low polarization noise of $2.16\,μ$K-arcmin, $LiteBIRD$ will be able to measure the full-sky…
View article: Advances in stray light characterization by ultrafast time-of-flight imaging
Advances in stray light characterization by ultrafast time-of-flight imaging Open
editorial reviewed
View article: Verification of straylight rejection of optical science payloads using a pulsed laser source
Verification of straylight rejection of optical science payloads using a pulsed laser source Open
editorial reviewed
View article: Using Deep Learning to Improve the Ray Tracing of Ghost Reflections
Using Deep Learning to Improve the Ray Tracing of Ghost Reflections Open