A5103936194- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Superconducting and THz Device Technology
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Pulsars and Gravitational Waves Research
- Computational Physics and Python Applications
- Superconducting Materials and Applications
- Scientific Research and Discoveries
- Astrophysical Phenomena and Observations
- Atmospheric Ozone and Climate
- Nuclear Physics and Applications
- Conducting polymers and applications
- Advanced Thermodynamic Systems and Engines
- Statistical and numerical algorithms
- Adaptive optics and wavefront sensing
- Statistical Mechanics and Entropy
- Physics of Superconductivity and Magnetism
- Solar and Space Plasma Dynamics
Centre de physique des particules de Marseille
2021-2025
Center for Astrophysics Harvard & Smithsonian
2018-2024
Centre National de la Recherche Scientifique
2014-2024
Aix-Marseille Université
2021-2024
University of Cincinnati
2022
California Institute of Technology
2022
SLAC National Accelerator Laboratory
2022
University of Oslo
2016-2022
Cardiff University
2020
Stanford University
2020
We present results from an analysis of all data taken by the BICEP2, Keck Array, and BICEP3 CMB polarization experiments up to including 2018 observing season. add additional Array observations at 220 GHz 95 previous 95/150/220 dataset. The Q/U maps now reach depths 2.8, 8.8 μK_{CMB} arcmin 95, 150, GHz, respectively, over effective area ≈600 square degrees ≈400 150 GHz. achieve a signal-to-noise ratio on polarized dust emission exceeding that Planck 353 take auto- cross-spectra between...
We present results from an analysis of all data taken by the bicep2/Keck CMB polarization experiments up to and including 2015 observing season. This includes first Keck Array observations at 220 GHz additional 95 150 GHz. The Q U maps reach depths 5.2, 2.9, 26 μKCMB arcmin 95, 150, GHz, respectively, over effective area ≈400 square degrees. achieve a signal noise on polarized dust emission approximately equal that Planck 353 take auto cross spectra between these publicly available WMAP...
Context. As type Ia supernova cosmology transitions from a statistics-dominated to systematics-dominated era, it is crucial understand the remaining unexplained uncertainties that affect their luminosity, such as those stemming astrophysical biases. Type supernovae are standardisable candles whose absolute magnitude reaches scatter of typically 0.15 mag when empirical correlations with light-curve stretch and colour environmental properties accounted for. Aims. We investigate dependence...
Context. Type Ia supernova (SN Ia) cosmology studies will soon be dominated by systematic, uncertainties, rather than statistical ones. Thus, it is crucial to understand the unknown phenomena potentially affecting their luminosity that may remain, such as astrophysical biases. For accurate application in studies, SN magnitudes need standardised; namely, they must corrected for correlation with light-curve width and colour. Aims. Here, we investigate how standardisation procedure used reduce...
ı tre diagram is a key tool for addressing observational systematics, such as the Malmquist bias. As distance modulus of SNe Ia derived from fit their light curves, robust simulation framework required. In this paper, we present performances skysurvey with aim to reproduce Zwicky Transient Facility (ZTF) SN DR2, which covers first phase ZTF and ran March 2018 December 2020. The DR2 sample corresponds almost 3000 classified cosmological quality. We simulated individual curves confirm validity...
Context. The unprecedented statistics of detected Type Ia supernovae (SNe Ia) brought by the Zwicky Transient Facility (ZTF) enable us to probe impact large-scale structure (LSS) on properties these objects. Aims. goal this paper is explore possible under-dense part LSS intrinsic SALT2 light-curve SNe and uncover biases in SN analyses. Methods. With a volume-limited selection ZTF-Cosmo-DR2 overlapping with SDSS-DR7 survey footprint, we investigated distribution their regard voids galaxy...
Abstract We present the first linear polarization measurements from 2015 long-duration balloon flight of Spider , which is an experiment that designed to map cosmic microwave background (CMB) on degree angular scales. The results these include maps and power spectra observations 4.8% sky at 95 150 GHz, along with internal consistency tests data. While polarized CMB anisotropy primordial density perturbations dominant signal in this region sky, Galactic dust emission also detected high...
We report on the design and performance of BICEP3 instrument its first three-year data set collected from 2016 to 2018. is a 52cm aperture, refracting telescope designed observe polarization cosmic microwave background (CMB) degree angular scales at 95GHz. It started science observation South Pole in with 2400 antenna-coupled transition-edge sensor (TES) bolometers. The receiver demonstrated new technologies such as large-diameter alumina optics, Zotefoam infrared filters, flux-activated...
Bicep Array is the newest multi-frequency instrument in Bicep/Keck program. It comprised of four 550mm aperture refractive telescopes observing polarization cosmic microwave background (CMB) at 30/40, 95, 150 and 220/270 GHz with over 30,000 detectors. We present an overview receiver, detailing optics, thermal, mechanical, magnetic shielding design. follows Bicep3's modular focal plane concept, upgrades to 6" wafer reduce fabrication higher detector count per module. The first receiver...
Our current understanding of the Universe is established through pristine measurements structure in cosmic microwave background (CMB) and distribution shapes galaxies tracing large scale (LSS) Universe. One key ingredient that underlies cosmological observables field sources observed assumed to be initially Gaussian with high precision. Nevertheless, a minimal deviation from Gaussianityis perhaps most robust theoretical prediction models explain Universe; itis necessarily present even...
Abstract The Vera Rubin Observatory Legacy Survey of Space and Time (LSST) is expected to process ∼10 6 transient detections per night. For precision measurements cosmological parameters rates, it critical understand the detection efficiency, magnitude limits, artifact contamination levels, biases in selection photometry. Here we rigorously test LSST Difference Image Analysis (DIA) pipeline using simulated images from Dark Energy Science Collaboration Data Challenge (DC2) simulation for...
We present estimates of line-of-sight distortion fields derived from the 95 GHz and 150 data taken by BICEP2, BICEP3, Keck Array up to 2018 observing season, leading cosmological constraints a study instrumental astrophysical systematics. Cosmological are three concerning gravitational lensing large-scale structure, polarization rotation magnetic or an axion-like field, screening effect patchy reionization. measure amplitude power spectrum $A_L^{\phi\phi}=0.95 \pm 0.20$. constrain rotation,...
We describe the details of binned bispectrum estimator as used for official 2013 and 2015 analyses temperature polarization CMB maps from ESA Planck satellite. The defining aspect this is determination a map (3-point correlation function) that has been in harmonic space. For parametric non-Gaussianity (the so-called fNL parameters), one takes inner product with theoretically motivated templates. However, complementary approach can also smooth using variable smoothing scale order to suppress...
We present a constraint on the tensor-to-scalar ratio, $r$, derived from measurements of cosmic microwave background (CMB) polarization $B$-modes with "delensing," whereby uncertainty $r$ contributed by sample variance gravitational lensing is reduced cross-correlating against $B$-mode template. This template constructed combining an estimate polarized CMB tracer projected large-scale structure. The large-scale-structure used map infrared Planck satellite data, while comes combination South...
Abstract We characterize Galactic dust filaments by correlating BICEP/Keck and Planck data with polarization templates based on neutral hydrogen (H i ) observations. Dust is important for both our understanding of astrophysical processes in the interstellar medium (ISM) search primordial gravitational waves cosmic microwave background (CMB). In diffuse ISM, H strongly correlated partly organized into that are aligned local magnetic field. analyze deep at 95, 150, 220 GHz, over...
Abstract Using data from the first flight of Spider and Planck High Frequency Instrument, we probe properties polarized emission interstellar dust in observing region. Component-separation algorithms operating both spatial harmonic domains are applied to their consistency quantify modeling errors associated with assumptions. Analyses diffuse Galactic spanning full region demonstrate (i) a spectral energy distribution that is broadly consistent modified-blackbody (MBB) model index β d = 1.45...
Measuring the growth rate of large-scale structures ($f$) as a function redshift has potential to break degeneracies between modified gravity and dark energy models, when combined with expansion-rate probes. Direct estimates peculiar velocities galaxies have gained interest estimate $f\sigma_8$. In particular, field-level methods can be used fit field nuisance parameter along cosmological parameters simultaneously. This article aims provide community an unified framework for theoretical...
Abstract We present a new upper limit on cosmic microwave background (CMB) circular polarization from the 2015 flight of Spider , balloon-borne telescope designed to search for B -mode linear inflation. Although level in CMB is predicted be very small, experimental limits provide valuable test underlying models. By exploiting nonzero circular-to-linear coupling half-wave plate modulators, data 's Antarctic constraint Stokes V at 95 and 150 GHz range <?CDATA $33\lt {\ell }\lt 307$?> <mml:math...
A detection of curl-type (B-mode) polarization the primary CMB would be direct evidence for inflationary paradigm origin Universe. The Bicep/Keck Array (BK) program targets degree angular scales, where power from primordial B-mode is expected to peak, with ever-increasing sensitivity and has published most stringent constraints on inflation date. Bicep (BA) Stage-3 instrument BK will comprise four Bicep3-class receivers observing at 30/40, 95, 150 220/270 GHz a combined 32,000+ detectors;...
We present an improved search for axionlike polarization oscillations in the cosmic microwave background (CMB) with observations from Keck Array. An all-sky, temporally sinusoidal rotation of CMB polarization, equivalent to a time-variable birefringence, is observable manifestation local axion field and potentially allows polarimeter detect dark matter directly. describe improvements method presented previous work, we demonstrate updated expanded dataset consisting 2012--2015 observing...
We derive an estimator for the lensing potential from galaxy number counts which contains a linear and quadratic term. show that this has much larger signal-to-noise ratio than corresponding intensity mapping. This is due to additional term in count angular power spectrum present already at order. estimate future photometric surveys. Particularly high redshifts, $z\gtrsim 1.5$, signal noise can become of order 30. Therefore, surveys would be excellent means measure tomographic spectra.
We use the binned bispectrum estimator to determine bispectra of dust, free-free, synchrotron, and AME galactic foregrounds using maps produced by Commander component separation method from Planck 2015 data. find that all these peak in squeezed configuration, allowing for potential confusion with particular local primordial shape. Applying an additional functionality implemented code, we then as templates $f_\mathrm{NL}$ analysis other maps. After testing validating code simulations, show...
BICEP3 is a 520mm aperture on-axis refracting telescope observing the polarization of cosmic microwave background (CMB) at 95GHz in search B-mode signal originating from ationary gravitational waves. BICEP3's focal plane populated with modularized tiles antenna-coupled transition edge sensor (TES) bolometers. was deployed to South Pole during 2014-15 austral summer and has been operational since. During 2016-17 summer, we implemented changes optical elements that lead better noise...
Understanding the impact of astrophysical environment on Type Ia supernova (SN Ia) properties is crucial to minimize systematic uncertainties in cosmological analyses based this probe. We investigate dependence SN SALT2.4 light-curve stretch distance from their nearest galaxy cluster study potential effect intracluster medium (ICM) intrinsic Ia. used largest sample date and cross-matched it with existing X-ray, Sunyaev-Zel'dovich, optical catalogs order relation between detected each modeled...