R. Stompor
A5014339868- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Superconducting and THz Device Technology
- Dark Matter and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Scientific Research and Discoveries
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Computational Physics and Python Applications
- Stellar, planetary, and galactic studies
- Relativity and Gravitational Theory
- Solar and Space Plasma Dynamics
- Statistical and numerical algorithms
- Gamma-ray bursts and supernovae
- Advanced Data Compression Techniques
- Spacecraft Design and Technology
- Distributed and Parallel Computing Systems
- Calibration and Measurement Techniques
- Particle physics theoretical and experimental studies
- Simulation Techniques and Applications
- Adaptive optics and wavefront sensing
- Advanced Thermodynamic Systems and Engines
- Advanced Differential Geometry Research
Université Paris Cité
2016-2025
Laboratoire AstroParticule et Cosmologie
2016-2025
Centre National de la Recherche Scientifique
2014-2023
Sorbonne Paris Cité
2012-2022
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2012-2022
Institut National de Physique Nucléaire et de Physique des Particules
2011-2022
École Nationale de la Statistique et de l'Administration Économique
2022
Institut de Recherche en Astrophysique et Planétologie
2020
Sapienza University of Rome
2020
Japan Aerospace Exploration Agency
2020
Recent results from BOOMERANG-98 and MAXIMA-1, taken together with COBE DMR, provide consistent high signal-to-noise measurements of the cosmic microwave background power spectrum at spherical harmonic multipole bands over 2<l less similar to 800. Analysis combined data yields 68% (95%) confidence limits on total density, Omega(tot) approximately 1.11+/-0.07 (+0.13)(-0.12), baryon Omega(b)h(2) 0.032(+0.005)(-0.004) (+0.009)(-0.008), scalar spectral tilt, n(s) 1.01(+0.09)(-0.07)...
We report a measurement of the B-mode polarization power spectrum in cosmic microwave background (CMB) using Polarbear experiment Chile. The faint signature carries information about universe's entire history gravitational structure formation, and inflation that may have occurred very early universe. Our covers angular multipole range 500 < ℓ 2100 is based on observations an effective sky area 25 with 35 resolution at 150 GHz. On these scales, lensing CMB by intervening universe expected to...
Context. The planck satellite will map the full sky at nine frequencies from 30 to 857 GHz. CMB intensity and polarization that are its prime targets contaminated by foreground emission.
Distortion of the cosmic microwave background by matter in universe, known as gravitational lensing, is observed POLARBEAR collaboration. The technique used here would allow for all gravitating to be mapped, and provide important corrections detection primordial waves background.
COrE (Cosmic Origins Explorer) is a fourth-generation full-sky, microwave-band satellite recently proposed to ESA within Cosmic Vision 2015-2025. will provide maps of the microwave sky in polarization and temperature 15 frequency bands, ranging from 45 GHz 795 GHz, with an angular resolution 23 arcmin (45 GHz) 1.3 (795 sensitivities roughly 10 30 times better than PLANCK (depending on channel). The mission lead breakthrough science wide range areas, primordial cosmology galactic...
Abstract We report an improved measurement of the cosmic microwave background B -mode polarization power spectrum with Polarbear experiment at 150 GHz. By adding new data collected during second season observations (2013–2014) to re-analyzed from first (2012–2013), we have reduced twofold band-power uncertainties. The band powers are reported over angular multipoles , where dominant signal is expected be due gravitational lensing E -modes. reject null hypothesis no a confidence 3.1 σ...
A new technique, first performed using the South Pole Telescope, that allows gravitational deflections of cosmic microwave background to be measured from photon polarization, gets further support measurements by POLARBEAR collaboration.
EBEX is a NASA-funded balloon-borne experiment designed to measure the polarization of cosmic microwave background (CMB). Observations will be made using 1432 transition edge sensor (TES) bolometric detectors read out with frequency multiplexed SQuIDs. observe in three bands centered at 150, 250, and 410 GHz, 768, 384, 280 each band, respectively. This broad coverage provide valuable information about polarized foreground signals from dust. The sky modulated an achromatic half wave plate...
We present the design and characterization of POLARBEAR experiment. will measure polarization cosmic microwave background (CMB) on angular scales ranging from experiment's 3.5 arcminute beam size to several degrees. The experiment utilizes a unique focal plane 1,274 antenna-coupled, sensitive TES bolometers cooled 250 milliKelvin. Employing this along with stringent control over systematic errors, has sensitivity detect expected small scale B-mode signal due gravitational lensing search for...
Inflation may provide unique insight into the physics at highest available energy scales that cannot be replicated in any realistic terrestrial experiment. Features primordial power spectrum are generically predicted a wide class of models inflation and its alternatives, observationally one most overlooked channels for finding evidence non-minimal inflationary models. Constraints from observations cosmic microwave background cover widest range feature frequencies, but sensitive constraints...
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...
We discuss an approach to the component separation of microwave, multi-frequency sky maps as those typically produced from Cosmic Microwave Background (CMB) Anisotropy data sets. The algorithm is based on two step, parametric, likelihood-based technique recently elaborated by Eriksen et al., (2006), where foreground spectral parameters are estimated prior actual components. In contrast with previous approaches, we accomplish former task help analytically-derived likelihood function for...
We extend the pure pseudo-power-spectrum formalism proposed recently in context of cosmic microwave background polarized power spectra estimation by Smith (2006) to incorporate cross-spectra computed for multiple maps same sky area. present an implementation such a technique, paying particular attention calculation relevant window functions and mixing (mode-coupling) matrices. discuss relevance treatment residual $E/B$ leakage number considered apodizations as well compromises assumptions...
POLARBEAR-2 (PB-2) is a cosmic microwave background (CMB) polarization experiment that will be located in the Atacama highland Chile at an altitude of 5200 m. Its science goals are to measure CMB signals originating from both primordial gravitational waves and weak lensing. PB-2 designed tensor scalar ratio, r, with precision {\sigma}(r) < 0.01, sum neutrino masses, {\Sigma}m{\nu}, {\sigma}({\Sigma}m{\nu}) 90 meV. To achieve these goals, employ 7588 transition-edge sensor bolometers 95 GHz...
We present a new, semianalytic framework for estimating the level of residuals in cosmic microwave background (CMB) maps derived from multifrequency CMB data and forecasting their impact on cosmological parameters. The are assumed to contain non-negligible signals astrophysical and/or Galactic origin, which we clean using parametric component separation technique. account discrepancies between foreground model during procedure true one, allowing differences scaling laws spatial variations....
We implement a simple, main beam correction in the maximum-likelihood, parametric component separation approach, which allows on accounting for different widths of input maps at frequencies without any preprocessing. validate approach full-sky and cut-sky simulations discuss importance impact assumptions simplifications. find that, cases when underlying sky model is indeed parametric, method successfully recovers spectral parameters predefined resolution. The improvement precision estimated...
EBEX is a balloon-borne polarimeter designed to measure the intensity and polarization of cosmic microwave background radiation. The measurements would probe inflationary epoch that took place shortly after big bang significantly improve constraints on values several cosmological parameters. unique in its broad frequency coverage ability provide critical information about level polarized Galactic foregrounds which will be necessary for all future CMB experiments. consists 1.5 m Dragone-type...
We discuss MAXIPOL, a bolometric balloon-borne experiment designed to measure the E-mode polarization of cosmic microwave background radiation (CMB). MAXIPOL is first CMB observe sky using rapid modulation. To build temperature anisotropy MAXIMA was retrofitted with rotating half-wave plate and stationary analyzer. describe instrument, observations, calibration reduction data collected twelve polarimeters operating at 140 GHz FWHM beam size 10 arcmin. present maps Q U Stokes parameters an 8...
MADmap is a software application used to produce maximum likelihood images of the sky from time-ordered data which include correlated noise, such as those gathered by cosmic microwave background (CMB) experiments. It works efficiently on platforms ranging small workstations most massively parallel supercomputers. Map-making critical step in analysis all CMB sets, and approach accurate widely applicable algorithm; however, it computationally challenging task. This challenge will only increase...
Using only cosmic microwave background polarization data from the POLARBEAR experiment, we measure $B$-mode delensing on subdegree scales at more than $5\sigma$ significance. We achieve a 14% power variance reduction, highest to date for internal delensing, and improve this result 2% by applying first time an iterative maximum posteriori method. Our analysis demonstrates capability of as means improving constraints inflationary models, paving way optimal next-generation primordial experiments.
We present results from and the analysis of data MAXIPOL, a balloon-borne experiment designed to measure polarization in Cosmic Microwave Background (CMB). MAXIPOL is first CMB obtain using rotating half-wave plate as rapid modulator. report observations sky area 8 deg^2 with 10-arcmin resolution, providing information up l~700. use maximum-likelihood method estimate maps Q U Stokes parameters demodulated time streams, then both Bayesian frequentist approaches compute EE, EB, BB power...
The Simons Array is an expansion of the POLARBEAR cosmic microwave background (CMB) polarization experiment currently observing from Atacama Desert in Northern Chile. This will create array three 3.5m telescopes each coupled to a multichroic bolometric receiver. have sensitivity produce ≥ 5σ detection inationary gravitational waves with tensor-to-scalar ratio r 0:01, detect known minimum 58 meV sum neutrino masses 3σ confidence when combined next-generation baryon acoustic oscillation...