Julien Carron
A5075149440- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Scientific Research and Discoveries
- Adaptive optics and wavefront sensing
- Dark Matter and Cosmic Phenomena
- Superconducting and THz Device Technology
- Statistical and numerical algorithms
- Solar and Space Plasma Dynamics
- Image and Signal Denoising Methods
- Stellar, planetary, and galactic studies
- Climate variability and models
- Atomic and Molecular Physics
- Quantum Chromodynamics and Particle Interactions
- Advanced Sensor Technologies Research
- Advanced Machining and Optimization Techniques
- Gaussian Processes and Bayesian Inference
- Computational Physics and Python Applications
- Pulsars and Gravitational Waves Research
- Blind Source Separation Techniques
- Quantum and Classical Electrodynamics
- Astrophysics and Star Formation Studies
University of Geneva
2021-2024
Eaton (Taiwan)
2024
Flatiron Institute
2024
Flatiron Health (United States)
2024
University of Sussex
2015-2022
École Polytechnique Fédérale de Lausanne
2004-2021
New York University
2021
University of Brighton
2019
Lawrence Berkeley National Laboratory
2018
University of California, Berkeley
2018
We present cosmological parameter results from the final full-mission Planck measurements of CMB anisotropies. find good consistency with standard spatially-flat 6-parameter $\Lambda$CDM cosmology having a power-law spectrum adiabatic scalar perturbations (denoted "base $\Lambda$CDM" in this paper), polarization, temperature, and lensing, separately combination. A combined analysis gives dark matter density $\Omega_c h^2 = 0.120\pm 0.001$, baryon $\Omega_b 0.0224\pm 0.0001$, spectral index...
The European Space Agency's Planck satellite, which was dedicated to studying the early Universe and its subsequent evolution, launched on 14 May 2009. It scanned microwave submillimetre sky continuously between 12 August 2009 23 October 2013, producing deep, high-resolution, all-sky maps in nine frequency bands from 30 857GHz. This paper presents cosmological legacy of Planck, currently provides our strongest constraints parameters standard model some tightest limits available deviations...
The Simons Observatory (SO) is a new cosmic microwave background experiment being built on Cerro Toco in Chile, due to begin observations the early 2020s. We describe scientific goals of experiment, motivate design, and forecast its performance. SO will measure temperature polarization anisotropy six frequency bands: 27, 39, 93, 145, 225 280 GHz. initial configuration have three small-aperture 0.5-m telescopes (SATs) one large-aperture 6-m telescope (LAT), with total 60,000 cryogenic...
Author(s): Aghanim, N; Akrami, Y; Ashdown, M; Aumont, J; Baccigalupi, C; Ballardini, Banday, AJ; Barreiro, RB; Bartolo, Basak, S; Battye, R; Benabed, K; Bernard, JP; Bersanelli, Bielewicz, P; Bock, JJ; Bond, JR; Borrill, Bouchet, FR; Boulanger, F; Bucher, Burigana, Butler, RC; Calabrese, E; Cardoso, JF; Carron, Challinor, A; Chiang, HC; Chluba, Colombo, LPL; Combet, Contreras, D; Crill, BP; Cuttaia, De Bernardis, Zotti, G; Delabrouille, Delouis, JM; DI Valentino, DIego, Dore, O; Douspis,...
We describe the legacy Planck cosmic microwave background (CMB) likelihoods derived from 2018 data release. The overall approach is similar in spirit to one retained for 2013 and 2015 release, with a hybrid method using different approximations at low ( ℓ < 30) high ≥ multipoles, implementing several methodological data-analysis refinements compared previous releases. With more realistic simulations, better correction modelling of systematic effects, we can now make full use CMB...
We present measurements of the cosmic microwave background (CMB) lensing potential using final Planck 2018 temperature and polarization data. Using maps filtered to account for noise anisotropy, we increase significance detection in from 5 σ 9 . Combined with temperature, is detected at 40 an extensive set tests robustness lensing-potential power spectrum, construct a minimum-variance estimator likelihood over multipoles 8 ≤ L 400 (extending range lower compared 2015), which use constrain...
We present the science case, reference design, and project plan for Stage-4 ground-based cosmic microwave background experiment CMB-S4.
This paper presents the High Frequency Instrument (HFI) data processing procedures for Planck 2018 release. Major improvements in mapmaking have been achieved since previous 2015 They enabled first significant measurement of reionization optical depth parameter using HFI data. an extensive analysis systematic effects, including use simulations to facilitate their removal and characterize residuals. The polarized data, which presented a number known problems release, are very significantly...
Abstract 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 origin evolution universe. Among science cases pursued with CMB-S4, quest for detecting primordial gravitational waves is a central driver experimental design. This work details development forecasting framework that includes power-spectrum-based semianalytic projection tool, targeted explicitly toward...
Abstract We reconstruct the Cosmic Microwave Background (CMB) lensing potential on latest Planck CMB PR4 (NPIPE) maps, which include slightly more data than 2018 PR3 release, and implement quadratic estimators using optimal filtering. increase reconstruction signal to noise by almost 20%, constraining amplitude of CMB-marginalized power spectrum in units best-fit 1.004 ± 0.024 (68% limits), is tightest constraint date. For a base ΛCDM cosmology we find σ 8 Ω m 0.25 = 0.599 0.016 from alone...
We present new measurements of cosmic microwave background (CMB) lensing over $9400$ sq. deg. the sky. These are derived from Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) CMB dataset, which consists five seasons ACT temperature and polarization observations. determine amplitude power spectrum at $2.3\%$ precision ($43\sigma$ significance) using a novel pipeline that minimizes sensitivity to foregrounds noise properties. To ensure our results robust, we analyze an extensive set null...
Abstract The tightest constraints on the tensor-to-scalar ratio r can only be obtained after removing a substantial fraction of lensing B -mode sample variance. planned Cosmic Microwave Background (CMB)-S4 experiment ( cmb-s4.org ) will remove signal internally by reconstructing gravitational lenses from high-resolution observations. We document here first reconstruction pipeline able to achieve this optimally for arbitrary sky coverage. make it part map-based framework test CMB-S4 delensing...
We study the constraining power on primordial non-Gaussianity of future surveys large-scale structure Universe for both near-term (such as Dark Energy Survey – DES) well longer term projects such Euclid and WFIRST. Specifically we perform a Fisher matrix analysis forecast surveys, using DES-like Euclid-like configurations examples, take account any expected photometric spectroscopic data. focus two-point statistics consider three observables: 3D galaxy spectrum in redshift space, angular...
We present 353 GHz full-sky maps of the polarization fraction $p$, angle $\psi$, and dispersion angles $S$ Galactic dust thermal emission produced from 2018 release Planck data. confirm that mean maximum $p$ decrease with increasing $N_H$. The uncertainty on fraction, $p_\mathrm{max}=22.0$% at 80 arcmin resolution, is dominated by zero level in total intensity. observed inverse behaviour between interpreted models polarized sky include effects only topology turbulent magnetic field. Thus,...
Gravitational lensing of the cosmic microwave background (CMB) is a valuable cosmological signal that correlates to tracers large-scale structure and acts as important source confusion for primordial $B$-mode polarization. State-of-the-art reconstruction analyses use quadratic estimators, which are easily applicable data. However, these estimators known be suboptimal, in particular polarization, large improvements expected possible high signal-to-noise polarization experiments. We develop...
The Simons Observatory (SO) is a ground-based cosmic microwave background (CMB) experiment sited on Cerro Toco in the Atacama Desert Chile that promises to provide breakthrough discoveries fundamental physics, cosmology, and astrophysics. Supported by Foundation, Heising-Simons with contributions from collaborating institutions, SO will see first light 2021 start five year survey 2022. has 287 collaborators 12 countries 53 including 85 students 90 postdocs. its currently funded form...
Abstract PICO is a concept for NASA probe-scale mission aiming to detect or constrain the tensor scalar ratio r , parameter that quantifies amplitude of inflationary gravity waves. We carry out map-based component separation on simulations with five foreground models and input values in = 0 0.003. forecast determinations using Gaussian likelihood assuming either no delensing residual lensing factor A lens 27%. By implementing first full-sky, post component-separation, map-domain delensing,...