A5011585397- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Superconducting and THz Device Technology
- Solar and Space Plasma Dynamics
- Galaxies: Formation, Evolution, Phenomena
- Dark Matter and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Blind Source Separation Techniques
- Pulsars and Gravitational Waves Research
- Spacecraft Design and Technology
- GNSS positioning and interference
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Monetary Policy and Economic Impact
- Advanced Optical Sensing Technologies
- Calibration and Measurement Techniques
- Advanced Vision and Imaging
- Engineering Applied Research
- Precipitation Measurement and Analysis
- Atmospheric Ozone and Climate
- Seismic Imaging and Inversion Techniques
Centre National de la Recherche Scientifique
2020-2024
Université Paris Cité
2022-2024
Laboratoire AstroParticule et Cosmologie
2022-2024
The University of Tokyo
2020-2024
Kavli Institute for the Physics and Mathematics of the Universe
2023-2024
High Energy Accelerator Research Organization
2024
Campbell Collaboration
2023
Sorbonne Paris Cité
2022
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2022
Japan Aerospace Exploration Agency
2020
Abstract LiteBIRD, the Lite (Light) satellite for study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission primordial cosmology fundamental physics. The Japan Aerospace Exploration Agency (JAXA) selected LiteBIRD in May 2019 as strategic large-class (L-class) mission, with an expected launch late 2020s using JAXA’s H3 rocket. planned to orbit Sun–Earth Lagrangian point L2, where it will map microwave over entire sky three years, telescopes 15...
Abstract We study the possibility of using LiteBIRD satellite B -mode survey to constrain models inflation producing specific features in CMB angular power spectra. explore a particular model example, i.e. spectator axion-SU(2) gauge field inflation. This can source parity-violating gravitational waves from amplification fluctuations driven by pseudoscalar “axionlike” field, rolling for few e-folds during The sourced exceed vacuum contribution at reionization bump scales about an order...
Abstract We estimate the efficiency of mitigating lensing B -mode polarization, so-called delensing, for LiteBIRD experiment with multiple external data sets lensing-mass tracers. The current best bound on tensor-to-scalar ratio, r , is limited by rather than Galactic foregrounds. Delensing will be a critical step to improve sensitivity as measurements become more and lensing. In this paper, we extend analysis recent forecast paper include mass tracers, i.e., CMB maps from CMB-S4-like...
In the era of large astronomical surveys, photometric classification supernovae (SNe) has become an important research field due to limited spectroscopic resources for candidate follow-up and classification. this work, we present a method photometrically classify type Ia based on machine learning with redshifts that are derived from SN light-curves. This is implemented real data SNLS deferred pipeline, purely pipeline identifies SNe at high-redshifts ($0.2<z<1.1$). Our consists two stages:...
Abstract We explore the capability of measuring lensing signals in LiteBIRD full-sky polarization maps. With a 30 arcmin beam width and an impressively low noise 2.16 μ K-arcmin, will be able to measure cosmic microwave background (CMB) very precisely. This unique sensitivity also enables reconstruction nearly map using only data, even considering its limited capture small-scale CMB anisotropies. In this paper, we investigate ability construct measurement presence Galactic foregrounds,...
Abstract We present a study of the impact beam far side-lobe lack knowledge on measurement Cosmic Microwave Background B -mode signal at large scale. Beam side-lobes induce mismatch in transfer function Galactic foregrounds between dipole and higher multipoles which degrads performances component separation methods. This leads to foreground residuals CMB map. It is expected be one main source systematic effects future polarization observations. Thus, it becomes crucial for all-sky survey...
Abstract The detection of primordial B modes the cosmic microwave background (CMB) could provide information about early stages Universe's evolution. faintness this signal requires exquisite calibration accuracy and control instrumental systematic effects which otherwise bias measurements. In work, we study impact an imperfect relative polarisation gain on recovered value tensor-to-scalar ratio r for LiteBIRD experiment, through application blind Needlet Internal Linear Combination (NILC)...
The Galileon model is a tensor-scalar theory of gravity which explains the late acceleration Universe expansion with no instabilities and recovers General Relativity in strong field limit. Most constraints obtained so far on parameters from cosmological data were derived for limited subset tracker solutions reported tensions between data. This paper presents first exploration general solution model, confronted against recent both background observables linear perturbations, using Monte-Carlo...
LiteBIRD, the next-generation cosmic microwave background (CMB) experiment, aims for a launch in Japan's fiscal year 2032, marking major advancement exploration of primordial cosmology and fundamental physics. Orbiting Sun-Earth Lagrangian point L2, this JAXA-led strategic L-class mission will conduct comprehensive mapping CMB polarization across entire sky. During its 3-year mission, LiteBIRD employ three telescopes within 15 unique frequency bands (ranging from 34 through 448 GHz),...
Abstract A methodology to provide the polarization angle requirements for different sets of detectors, at a given frequency CMB experiment, is presented. The uncertainties in each detector set are related bias on tensor-to-scalar ratio r parameter. approach grounded using linear combination obtain signal. In addition, assuming that small limit (lower than few degrees), it possible derive analytic expressions establish requirements. also accounts correlations among may originate from optics,...
Mitigation of the impact foreground contributions to measurements cosmic microwave background (CMB) polarization is a crucial step in modern CMB data analysis and particular importance for detection large-scale $B$ modes. A large variety techniques, based on different assumptions aiming at either full component separation or merely cleaning signals from maps, have been described literature. In this work, we consider problem within unified framework maximum likelihood principle, under...
We assess the capabilities of LiteBIRD mission to map hot gas distribution in Universe through thermal Sunyaev-Zeldovich (SZ) effect. Our analysis relies on comprehensive simulations incorporating various sources Galactic and extragalactic foreground emission, while accounting for specific instrumental characteristics LiteBIRD, such as detector sensitivities, frequency-dependent beam convolution, inhomogeneous sky scanning, $1/f$ noise. implement a tailored component-separation pipeline SZ...
Large angular scale surveys in the absence of atmosphere are essential for measuring primordial $B$-mode power spectrum Cosmic Microwave Background (CMB). Since this proposed measurement is about three to four orders magnitude fainter than temperature anisotropies CMB, in-flight calibration instruments and active suppression systematic effects crucial. We investigate effect changing parameters scanning strategy on effectiveness, themselves, ability distinguish by null-tests. Next-generation...
We report on the breadboard model of a polarization modulator unit (PMU) using sapphire-based achromatic half-wave plate (HWP) for low-frequency telescope (LFT) LiteBIRD, JAXA-led space mission to probe cosmic inflation by observing microwave background. The PMU is key component reduce 1/f noise and systematic effects between two orthogonal polarized detectors. For HWP, we glued together surfaces five 330 mm diameter sapphire plates hydro catalysis bonding, working as HWP in LFT bands. also...
Abstract We assess the capabilities of LiteBIRD mission to map hot gas distribution in Universe through thermal Sunyaev-Zeldovich (SZ) effect. Our analysis relies on comprehensive simulations incorporating various sources Galactic and extragalactic foreground emission, while accounting for specific instrumental characteristics mission, such as detector sensitivities, frequency-dependent beam convolution, inhomogeneous sky scanning, 1/ f noise. implement a tailored component-separation...
The DBI-Galileon model is a scalar-tensor theory of gravity which defined as the most general dynamics 4D brane embedded in 5D bulk. It particular interest it introduces only few free parameters, all with clear physical meaning, such tension related to cosmological constant. From tight constraints on gravitational waves speed, we are naturally led consider non-relativistic limit where kinetic energy small compared its tension, that study context late-time cosmology. We show an expansion...
Mitigation of the impact foreground contributions to measurements Cosmic Microwave Background (CMB) polarization is a crucial step in modern CMB data analysis and particular importance for detection large-scale $B$ modes. A large variety techniques, based on different assumptions aiming at either full component separation or merely cleaning signals from maps, have been described literature. In this work, we consider problem within unified framework maximum likelihood principle, under...
We study the possibility of using $LiteBIRD$ satellite $B$-mode survey to constrain models inflation producing specific features in CMB angular power spectra. explore a particular model example, i.e. spectator axion-SU(2) gauge field inflation. This can source parity-violating gravitational waves from amplification fluctuations driven by pseudoscalar "axionlike" field, rolling for few e-folds during The sourced exceed vacuum contribution at reionization bump scales about an order magnitude...
We estimate the efficiency of mitigating lensing $B$-mode polarization, so-called delensing, for $LiteBIRD$ experiment with multiple external data sets lensing-mass tracers. The current best bound on tensor-to-scalar ratio, $r$, is limited by rather than Galactic foregrounds. Delensing will be a critical step to improve sensitivity $r$ as measurements become more and lensing. In this paper, we extend analysis recent forecast paper include mass tracers, i.e., CMB maps from CMB-S4-like...
We present a study of the impact an uncertainty in beam far side-lobe knowledge on measurement Cosmic Microwave Background $B$-mode signal at large scale. It is expected to be one main source systematic effects future CMB observations. Because it crucial for all-sky survey missions take into account interplays between and all data analysis steps, primary goal this paper provide methodology carry out end-to-end their effect space-borne polarization experiment, up cosmological results form...