V. Ruhlmann-Kleider
A5105463028- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Computational Physics and Python Applications
- Stellar, planetary, and galactic studies
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Neutrino Physics Research
- Astronomical Observations and Instrumentation
- Scientific Research and Discoveries
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Pulsars and Gravitational Waves Research
- Remote Sensing in Agriculture
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Geophysics and Gravity Measurements
- Atomic and Subatomic Physics Research
- Astrophysical Phenomena and Observations
CEA Paris-Saclay
2016-2025
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2025
Institut de Recherche sur les Lois Fondamentales de l'Univers
2016-2025
Université Paris-Saclay
1996-2024
The Ohio State University
2021
Iowa State University
2002-2014
DSM (Netherlands)
1993-2009
European Organization for Nuclear Research
2004-2007
Karlsruhe Institute of Technology
2004-2007
University of Glasgow
2006
Aims. We present cosmological constraints from a joint analysis of type Ia supernova (SN Ia) observations obtained by the SDSS-II and SNLS collaborations. The dataset includes several low-redshift samples (z< 0.1), all three seasons (0.05 <z< 0.4), years (0.2 1), it totals 740 spectroscopically confirmed supernovae with high-quality light curves.
We present the cosmological implications from final measurements of clustering using galaxies, quasars, and Ly$\alpha$ forests completed Sloan Digital Sky Survey (SDSS) lineage experiments in large-scale structure. These experiments, composed data SDSS, SDSS-II, BOSS, eBOSS, offer independent baryon acoustic oscillation (BAO) angular-diameter distances Hubble relative to sound horizon, $r_d$, eight different samples six growth rate parameter, $f\sigma_8$, redshift-space distortions (RSD)....
We combine high redshift Type Ia supernovae from the first 3 years of Supernova Legacy Survey (SNLS) with other supernova (SN) samples, primarily at lower redshifts, to form a high-quality joint sample 472 SNe (123 low-$z$, 93 SDSS, 242 SNLS, and 14 {\it Hubble Space Telescope}). SN data alone require cosmic acceleration >99.9% confidence, including systematic effects. For dark energy equation state parameter (assumed constant out least $z=1.4$) in flat universe, we find $w =...
We present an empirical model of Type Ia supernovae spectro-photometric evolution with time. The is built using a large data set including light-curves and spectra both nearby distant supernovae, the latter being observed by SNLS collaboration. derive average spectral sequence their main variability components color variation law. allows us to measure distance moduli in range 2500-8000 A calculable uncertainties, those arising from features. Thanks use high-redshift SNe rest-frame UV energy...
We present photometric properties and distance measurements of 252 high redshift Type Ia supernovae (0.15 < z 1.1) discovered during the first three years Supernova Legacy Survey (SNLS). These events were detected their multi-colour light curves measured using MegaPrime/MegaCam instrument at Canada-France-Hawaii Telescope (CFHT), by repeatedly imaging four one-square degree fields in bands. Follow-up spectroscopy was performed VLT, Gemini Keck telescopes to confirm nature measure redshifts....
We present observational constraints on the nature of dark energy using Supernova Legacy Survey three-year sample (SNLS3) Guy et al. and Conley use 472 Type Ia supernovae (SNe Ia) in this sample, accounting for recently discovered correlations between SN luminosity host galaxy properties, include effects all identified systematic uncertainties directly cosmological fits. Combining SNLS3 data with full WMAP7 power spectrum, Sloan Digital Sky luminous red a prior Hubble constant H0 from SHOES,...
(Abridged) Precision cosmology with Type Ia supernovae (SNe Ia) makes use of the fact that SN luminosities depend on their light-curve shapes and colours. Using Supernova Legacy Survey (SNLS) other data, we show there is an additional dependence global characteristics host galaxies: events same shape colour are, average, 0.08mag (~4.0sigma) brighter in massive galaxies (presumably metal-rich) low specific star-formation rates (sSFR). SNe a sSFR also have smaller slope ("beta") between...
We analyse the clustering of Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Data Release 16 luminous red galaxy sample (DR16 eBOSS LRG) in combination with high redshift tail III 12 (DR12 BOSS CMASS). measure space distortions (RSD) and also extract longitudinal transverse baryonic acoustic oscillation (BAO) scale from anisotropic power spectrum signal inferred 377,458 galaxies between redshifts 0.6 1.0, effective $z_{\rm eff}=0.698$ comoving volume $2.72\,{\rm...
We analyse the large-scale clustering in Fourier space of emission line galaxies (ELG) from Data Release 16 Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey. The ELG sample contains 173,736 covering 1,170 square degrees redshift range $0.6 < z 1.1$. perform a BAO measurement post-reconstruction power spectrum monopole, and study distortions (RSD) first three even multipoles. Photometric variations yield fluctuations both angular radial survey selection functions....
We present large-scale structure catalogs from the completed extended Baryon Oscillation Spectroscopic Survey (eBOSS). Derived Sloan Digital Sky (SDSS) -IV Data Release 16 (DR16), these provide data samples, corrected for observational systematics, and random positions sampling survey selection function. Combined, they allow clustering measurements suitable testing cosmological models. describe methods used to create eBOSS DR16 Luminous Red Galaxy (LRG) Quasar samples. The quasar catalog...
Abstract The Dark Energy Spectroscopic Instrument (DESI) Survey has obtained a set of spectroscopic measurements galaxies to validate the final survey design and target selections. To assist in these tasks, we visually inspect DESI spectra approximately 2500 bright galaxies, 3500 luminous red (LRGs), 10,000 emission-line (ELGs) obtain robust redshift identifications. We then utilize inspected information characterize performance operation. Based on visual inspection (VI) catalogs, our...
Abstract We implement Crossing Statistics to reconstruct in a model-agnostic manner the expansion history of universe and properties dark energy, using DESI Data Release 1 (DR1) BAO data combination with one three different supernova compilations (PantheonPlus, Union3, DES-SN5YR) Planck CMB observations. Our results hint towards an evolving emergent energy behaviour, negligible presence at z ≳ 1, varying significance depending on sets combined. In all these reconstructions, cosmological...
Baryon acoustic oscillation data from the first year of Dark Energy Spectroscopic Instrument (DESI) provide near percent-level precision cosmic distances in seven bins over redshift range $z=0.1$-$4.2$. We use this data, together with other distance probes, to constrain expansion history using some well-motivated physical classes dark energy. In particular, we explore three physics-focused behaviors energy equation state and density perspectives: thawing class (matching many simple...
Abstract We present a method to mitigate the effects of fiber assignment incompleteness in two-point power spectrum and correlation function measurements from galaxy spectroscopic surveys, by truncating small angular scales estimators. derive corresponding modified windows account for scale truncation theory prediction. validate this approach on simulations reproducing Dark Energy Spectroscopic Instrument (DESI) Data Release 1 (DR1) with without assignment. show that we recover unbiased...
We present the anisotropic clustering of emission line galaxies (ELGs) from Sloan Digital Sky Survey IV (SDSS-IV) extended Baryon Oscillation Spectroscopic (eBOSS) Data Release 16 (DR16). Our sample is composed 173,736 ELGs covering an area 1170 deg$^2$ over redshift range $0.6 \leq z 1.1$. use Convolution Lagrangian Perturbation Theory in addition to Gaussian Streaming Redshift-Space Distortions model Legendre multipoles correlation function. show that eBOSS ELG function measurement...
The Dark Energy Spectroscopic Instrument (DESI) is a Stage IV ground-based dark energy experiment that will study baryon acoustic oscillations (BAO) and the growth of structure through redshift-space distortions with wide-area galaxy quasar spectroscopic redshift survey. DESI instrument consists new wide-field (3.2 deg. linear field view) corrector plus multi-object spectrometer up to 5000 robotically positioned optical fibers be installed at prime focus on Mayall 4m telescope Kitt Peak,...
We present the Emission Line Galaxy (ELG) sample of extended Baryon Oscillation Spectroscopic Survey (eBOSS) from Sloan Digital Sky IV Data Release 16 (DR16). After describing observations and redshift measurement for 269,243 observed ELG spectra over 1170 deg$^2$, we large-scale structure catalogues, which are used cosmological analysis. These catalogues contain 173,736 reliable spectroscopic redshifts between 0.6 1.1, along with associated random quantifying extent observations,...
Abstract The One-Percent survey of the Dark Energy Spectroscopic Instrument collected ∼ 270 k emission line galaxies (ELGs) at 0.8 < z 1.6. high completeness sample allowed clustering to be measured down scales never probed before, 0.04 Mpc/ h in r p for projected 2-point correlation function (2PCF) and 0.17 galaxy pair separation s 2PCF monopole quadrupole. most striking feature measurements is a strong signal smallest scales, below 0.2 1 . We analyse these data halo occupation...
ABSTRACT We present a clustering analysis of the BOSS DR12 CMASS galaxy sample, combining measurements two-point correlation function and density-split down to scale $1 \, h^{-1}\, \text{Mpc}$. Our theoretical framework is based on emulators trained high-fidelity mock catalogues that forward model cosmological dependence statistics within an extended-ΛCDM framework, including redshift-space Alcock–Paczynski distortions. base-ΛCDM finds ωcdm = 0.1201 ± 0.0022, σ8 0.792 0.034, ns 0.970 0.018,...
We implement Crossing Statistics to reconstruct in a model-agnostic manner the expansion history of universe and properties dark energy, using DESI Data Release 1 (DR1) BAO data combination with one three different supernova compilations (PantheonPlus, Union3, DES-SN5YR) Planck CMB observations. Our results hint towards an evolving emergent energy behaviour, negligible presence at $z\gtrsim 1$, varying significance depending on sets combined. In all these reconstructions, cosmological...
We use three years of data from the Supernova Legacy Survey (SNLS) to study general properties core-collapse and type Ia supernovae. This is first such using "rolling search" technique which guarantees well-sampled SNLS light curves good efficiency for supernovae brighter than $i^\prime\sim24$. Using host photometric redshifts, we measure supernova absolute magnitude distribution down luminosities $4.5 {\rm mag}$ fainter normal SNIa. spectroscopy light-curve fitting discriminate against...
We present spectra and light curves of SNLS 06D4eu 07D2bv, two hydrogen-free superluminous supernovae (SNe) discovered by the Supernova Legacy Survey. At z = 1.588, is highest redshift SN with a spectrum, at MU −22.7 it one most luminous SNe ever observed, gives rare glimpse into rest-frame ultraviolet where these put out their peak energy. 07D2bv does not have host galaxy redshift, but on basis we estimate to be ∼ 1.5. Both similar observer-frame griz curves, which map in U band UV, rising...
While it is generally accepted that Type Ia supernovae are the result of explosion a carbon–oxygen white dwarf accreting mass in binary system, details their genesis still elude us, and nature companion uncertain. Kasen points out presence non-degenerate progenitor system could leave an observable trace: flux excess early rise portion light curve caused by ejecta impact with itself. This would be only under favorable viewing angles, its intensity depends on companion. We searched for...
We present observations of four rapidly rising (t_{rise}~10d) transients with peak luminosities between those supernovae (SNe) and superluminous SNe (M_{peak}~-20) - one discovered followed by the Palomar Transient Factory (PTF) three Supernova Legacy Survey (SNLS). The light curves resemble SN 2011kl, recently shown to be associated an ultra-long-duration gamma ray burst (GRB), though no GRB was seen accompany our SNe. rapid rise a luminous places these events in unique part phase space,...
We present a measurement of the volumetric rate superluminous supernovae (SLSNe) at z~1, measured using archival data from first four years Canada-France-Hawaii Telescope Supernova Legacy Survey (SNLS). develop method for photometric classification SLSNe to construct our sample. Our sample includes two previously spectroscopically-identified objects, and further new candidate selected technique. use point-source recovery efficiencies Perrett et.al. (2010) Monte Carlo approach calculate based...