A. Manzotti
A5083471779- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Natural Language Processing Techniques
- Topic Modeling
- Advanced Statistical Methods and Models
- Speech and dialogue systems
- Stellar, planetary, and galactic studies
- Pulsars and Gravitational Waves Research
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Statistical Methods and Inference
- Solar and Space Plasma Dynamics
- Hand Gesture Recognition Systems
- Forest ecology and management
- Hearing Impairment and Communication
- Advanced Mathematical Theories and Applications
- Computational Physics and Python Applications
- Astrophysics and Star Formation Studies
- Relativity and Gravitational Theory
- Robot Manipulation and Learning
- Diffusion and Search Dynamics
Sapienza University of Rome
2022-2023
Amazon (United States)
2022
Institut d'Astrophysique de Paris
2018-2021
University of Chicago
2014-2021
Fermi National Accelerator Laboratory
2014-2016
Netherlands Institute for Radio Astronomy
2015
University of Parma
2010
Metropolitan University
2002
Simón Bolívar University
2001
We combine Dark Energy Survey Year 1 clustering and weak lensing data with Baryon Acoustic Oscillations (BAO) Big Bang Nucleosynthesis (BBN) experiments to constrain the Hubble constant. Assuming a flat $\Lambda$CDM model minimal neutrino mass ($\sum m_\nu = 0.06$ eV) we find $H_0=67.2^{+1.2}_{-1.0}$ km/s/Mpc (68% CL). This result is completely independent of constant measurements based on distance ladder, Cosmic Microwave Background (CMB) anisotropies (both temperature polarization), strong...
We present measurements of the $E$-mode polarization angular auto-power spectrum ($EE$) and temperature-$E$-mode cross-power ($TE$) cosmic microwave background (CMB) using 150 GHz data from three seasons SPTpol observations. report power spectra over spherical harmonic multipole range $50 < \ell \leq 8000$, detect nine acoustic peaks in $EE$ with high signal-to-noise ratio. These are most sensitive to date $TE$ at $\ell > 1050$ 1475$, respectively. The observations cover 500 deg$^2$, a...
Abstract We present a measurement of the cosmic microwave background lensing potential using 500 deg 2 150 GHz data from SPTpol receiver on South Pole Telescope. The is reconstructed with signal-to-noise per mode greater than unity at multipoles L ≲ 250, quadratic estimator combination temperature and polarization maps. report measurements power spectrum in multipole range 100 < 2000 sets temperature-only ( T ), polarization-only (POL), minimum-variance (MV) estimators. measure amplitude...
Abstract We present cosmological constraints based on the cosmic microwave background (CMB) lensing potential power spectrum measurement from recent 500 deg 2 SPTpol survey, most precise CMB ground to date. fit a flat ΛCDM model reconstructed alone and in addition with other data sets: baryon acoustic oscillations (BAO), as well primary spectra Planck . The band powers are good agreement when analyzed combination full-sky data. With weak priors density parameters, provide 4% constraint...
We present results from a large-scale experiment on pretraining encoders with non-embedding parameter counts ranging 700M to 9.3B, their subsequent distillation into smaller models 17M-170M parameters, and application the Natural Language Understanding (NLU) component of virtual assistant system. Though we train using 70% spoken-form data, our teacher perform comparably XLM-R mT5 when evaluated written-form Cross-lingual Inference (XNLI) corpus. second stage in-domain data system, improving...
Abstract We present a cosmic microwave background (CMB) lensing map produced from linear combination of South Pole Telescope (SPT) and Planck temperature data. The 150 GHz data the 2500 deg 2 SPT-SZ survey is combined with 143 in harmonic space to obtain that has broader ℓ coverage less noise than either individual map. Using quadratic estimator technique on this map, we produce gravitational potential projected along line sight. measure auto-spectrum <?CDATA ${C}_{L}^{\phi \phi }$?> ,...
The authors report on a search for cosmic birefringence in region of the southern sky, with South Pole Telescope. They reconstruct map polarization rotation anisotropies and measure angular power spectrum map, finding it to be consistent zero. This non detection is used place constraints strength primordial magnetic fields coupling constant electromagnetic Chern-Simons term.
We perform a joint analysis of the auto and cross-correlations between three cosmic fields: galaxy density field, weak lensing shear microwave background (CMB) convergence field. These fields are measured using roughly 1300 sq. deg. overlapping optical imaging data from first year observations Dark Energy Survey (DES) millimeter-wave CMB both South Pole Telescope Sunyaev-Zel'dovich survey Planck. present cosmological constraints two-point correlation functions with lensing. test for...
Clusters of galaxies gravitationally lens the cosmic microwave background (CMB) radiation, resulting in a distinct imprint CMB on arcminute scales. Measurement this effect offers promising way to constrain masses galaxy clusters, particularly those at high redshift. We use maps from South Pole Telescope Sunyaev–Zel'dovich (SZ) survey measure lensing signal around clusters identified optical imaging first year observations Dark Energy Survey. The cluster catalogue used analysis contains 3697...
We measure the cross-correlation between redMaGiC galaxies selected from Dark Energy Survey (DES) Year-1 data and gravitational lensing of cosmic microwave background (CMB) reconstructed South Pole Telescope (SPT) Planck over 1289 sq. deg. When combining measurements across multiple galaxy redshift bins spanning range $0.15<z<0.90$, we reject hypothesis no correlation at 19.9$\sigma$ significance. removing small-scale points where thermal Sunyaev-Zel'dovich signal nonlinear bias could...
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...
We present a demonstration of delensing the observed cosmic microwave background (CMB) B-mode polarization anisotropy. This process reducing gravitational-lensing generated component will become increasingly important for improving searches B modes produced by primordial gravitational waves. In this work, we delens maps constructed from multi-frequency SPTpol observations 90 deg$^2$ patch sky subtracting template two inputs: E-mode and lensing potential map estimated $\textit{Herschel}$...
We study the random-walk problem on a deterministic scale-free network, in presence of set static, identical targets; due to strong inhomogeneity underlying structure mean first-passage time (MFPT), meant as measure transport efficiency, is expected depend sensitively position targets. consider several spatial arrangements for targets and we calculate, mainly rigorously, related MFPT, where average taken over all possible starting points paths. For cases studied, MFPT asymptotically scales...
Standard cosmological perturbation theory (SPT) for the Large Scale Structure (LSS) of Universe fails at small scales (UV) due to strong nonlinearities and multistreaming effects. In ref. [1] a new framework was proposed in which large (IR) are treated perturbatively while information on UV, mainly scale velocity dispersion, is obtained by nonlinear methods like N-body simulations. Here we develop this approach, showing that it possible reproduce fully power spectrum (PS) combining simple...
Abstract We report constraints on cosmological parameters from the angular power spectrum of a cosmic microwave background (CMB) gravitational lensing potential map created using temperature data 2500 deg 2 South Pole Telescope (SPT) supplemented with Planck in same sky region, statistical combined primarily SPT data. fit to model including cold dark matter and constant ( <?CDATA ${\rm{\Lambda }}\mathrm{CDM}$?> ), models single-parameter extensions . find that are comparable consistent those...
Lensing of the cosmic microwave background by modes that are larger than size survey dilates intrinsic scales in temperature and polarization fields coherently shifts their observed power spectra with respect to ensemble or all-sky mean. The effect can be simply encapsulated as a contribution spectrum covariance matrix accordance lensing trispectrum an additional parameter, mean convergence field, for parameter estimation. It should included upcoming surveys precisely measure acoustic...
The primordial B-modes component of the cosmic microwave background (CMB) polarization is a promising experimental data set to probe inflationary paradigm. B modes are indeed direct consequence presence gravitational waves in early Universe. However, several secondary effects low-redshift universe will produce nonprimordial modes. In particular, interactions CMB photons with large-scale structures distort E modes, adding lensing B-mode signal. Removing (``delensing'') then be necessary...
We cross-correlate galaxy weak lensing measurements from the Dark Energy Survey (DES) year-one data with a cosmic microwave background (CMB) map derived South Pole Telescope (SPT) and Planck data, an effective overlapping area of $1289\text{ }\text{ }{\mathrm{deg}}^{2}$. With combined four source redshift bins, we obtain detection significance $5.8\ensuremath{\sigma}$. fit amplitude correlation functions while fixing cosmological parameters to fiducial...
On large scales, the anisotropies in cosmic microwave background (CMB) reflect not only primordial density field but also energy gain when photons traverse decaying gravitational potentials of scale structure, what is called integrated Sachs-Wolfe (ISW) effect. Decomposing anisotropy signal into a piece and an ISW component, main secondary effect on more urgent than ever as cosmologists strive to understand Universe those scales. We present likelihood technique for extracting combining...
ABSTRACT Correlations between tracers of the matter density field and gravitational lensing are sensitive to evolution power spectrum expansion rate across cosmic time. Appropriately defined ratios such correlation functions, on other hand, depend only angular diameter distances tracer objects source planes. Because their simple cosmological dependence, can exploit available signal-to-noise ratio down small scales, even where directly modelling functions is difficult. We present a...
We develop a Maximum Likelihood estimator (MLE) to measure the masses of galaxy clusters through impact gravitational lensing on temperature and polarization anisotropies cosmic microwave background (CMB). show that, at low noise levels in temperature, this optimal outperforms standard quadratic by factor two. For polarization, we that Stokes Q/U maps can be used instead traditional E- B-mode without losing information. test quantify bias recovered mass for comprehensive list potential...
Galaxy surveys probe both structure formation and the expansion rate, making them promising avenues for understanding dark universe. Photometric accurately map 2D distribution of galaxy positions shapes in a given redshift range, while spectroscopic provide sparser 3D maps distribution. We present way to analyse overlapping jointly without loss information. represent using spherical Fourier-Bessel (sFB) modes, which preserve radial coverage accounting sky geometry, we decompose harmonic...
Planned cosmic microwave background (CMB) experiments will improve what we know about neutrino physics, inflation, and dark energy. The low level of noise, together with improved angular resolution, increase the signal-to-noise ratio CMB polarized data as well reconstructed lensing potential large scale structure. Projected constraints on cosmological parameters are tight, but these can be even further information from external experiments. Here, examine quantitatively extent to which priors...