A5004836443- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- Stellar, planetary, and galactic studies
- Advanced Mathematical Theories and Applications
- Solar and Space Plasma Dynamics
- Advanced Differential Geometry Research
- Mathematics and Applications
- Simulation Techniques and Applications
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Advanced Physical and Chemical Molecular Interactions
- Computational Physics and Python Applications
- Advanced Thermodynamics and Statistical Mechanics
- Relativity and Gravitational Theory
- Neutrino Physics Research
- Quantum chaos and dynamical systems
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2025
Technion – Israel Institute of Technology
2023-2024
University of Parma
2019-2023
Istituto Nazionale di Fisica Nucleare
2021
Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Parma
2019
Abstract We develop a pipeline to set new constraints on scale-independent modified gravity, from the galaxy power spectrum in redshift space of BOSS DR12. The latter is modelled using effective field theory large-scale structure up 1-loop order perturbation theory. test our synthetic and simulated data, assess systematic biases inferred cosmological parameters due marginalization theoretical errors, we apply it normal branch DGP model with ΛCDM background. When applied data simulations,...
Abstract A new and promising avenue was recently developed for analyzing large-scale structure data with a model-independent approach, in which the linear power spectrum shape is parametrized large number of freely varying wavebands rather than by assuming specific cosmological models. We call this method FreePower. Here we show, using Fisher matrix that precision case one-loop greatly improved inclusion tree-level bispectrum. also show accuracy can be similarly employing perturbation theory...
Context. The Euclid space satellite mission will measure the large-scale clustering of galaxies at an unprecedented precision, providing a unique probe modifications to ΛCDM model. Aims. We investigated approximations needed efficiently predict matter and dark halos in context modified gravity exotic energy scenarios. examined normal branch Dvali–Gabadadze–Porrati model, Hu–Sawicki f ( R ) slowly evolving interacting massive neutrinos. For each, we tested for perturbative kernel...
We investigate the accuracy of perturbative galaxy bias expansion in view forthcoming analysis Euclid spectroscopic samples. compare performance a Eulerian using state-of-the-art prescriptions from effective field theory large-scale structure (EFTofLSS) with hybrid approach based on Lagrangian perturbation and high-resolution simulations. These models are benchmarked against comoving snapshots flagship I N -body simulation at z = (0.9, 1.2, 1.5, 1.8), which have been populated H α galaxies...
We propose a methodology to measure the cosmological spatial curvature by employing deviation from statistical isotropy due Alcock-Paczy\ifmmode \acute{n}\else \'{n}\fi{}ski effect of large scale galaxy clustering. This approach has higher degree model independence than most other proposed methods, being independent calibration standard candles, rulers, or clocks, power spectrum shape (and thus also prerecombination physics), bias, theory gravity, dark energy model, and background cosmology...
Abstract We constrain dark energy and modified gravity within the effective field theory of framework using full-shape BOSS galaxy power spectrum, combined with Planck cosmic microwave background (CMB) data recent baryon acoustic oscillations (BAO) measurements from DESI. Specifically, we focus on a varying braiding parameter α B , running “effective” mass M constant equation state w . The analysis is performed two these parameters at time, including all other standard cosmological...
Abstract We develop a model-independent approach to Lagrangian perturbation theory for the large scale structure of universe. focus on displacement field dark matter particles, and derive its most general without assuming specific form equations motion, but implementing set requirements based symmetry principles consistency with perturbative approach. present explicit results up sixth order, provide an algorithmic procedure arbitrarily higher orders. The resulting is expressed as expansion...
We investigate the role played by symmetries in perturbative expansion of large-scale structure. In particular, we establish which coefficients perturbation theory kernels are dictated and not. Up to third order perturbations, for dark matter density contrast (and velocity) only three not fixed depend on particular cosmology. For generic biased tracers, where number/mass momentum conservation cannot be imposed general, this number rises seven agreement with other bias expansions discussed...
We propose a methodology to measure the cosmological spatial curvature by employing deviation from statistical isotropy due Alcock-Paczy\'nski effect of large scale galaxy clustering. This approach has higher degree model independence than most other proposed methods, being independent calibration standard candles, rulers, or clocks, power spectrum shape (and thus also pre-recombination physics), bias, theory gravity, dark energy and background cosmology in general. find that combined...
Abstract We present the results of a set cosmological N-body simulations with standard ΛCDM cosmology but characterized by scale-dependent primordial non-Gaussianity local type featuring power-law dependence f NL loc ( k ) at large scales followed saturation to constant value smaller where non-linear growth leads formation collapsed cosmic structures. Such models are built ensure consistency current Cosmic Microwave Background bounds on yet allowing for effects non-Gaussian statistics...
The Consistency Relations for the Large Scale Structure provide a link between amplitude of Baryonic Acoustic Oscillations in squeezed bispectrum (BS) and power spectrum (PS). This relation depends on large scale bias considered tracer, $b_\alpha$, growth rate structures, $f$. Remarkably, originating from basic symmetry principles, this is exact independent underlying cosmological model. By analysing data volume simulations, both dark matter haloes, we illustrate how BS PS measurements can...
Consistency Relations (CR) for the Large Scale Structure are exact equalities between correlation functions of different order. These relations descend from equivalence principle and hold primordial perturbations generated by single-field models inflation. They not affected nonlinearities also biased tracers in redshift space. We show that Baryonic Acoustic Oscillations (BAO) bispectrum (BS) squeezed limit suppressed with respect to those power spectrum (PS) a coefficient depends on BS...
We investigate the accuracy of perturbative galaxy bias expansion in view forthcoming analysis Euclid spectroscopic samples. compare performance an Eulerian expansion, using state-of-art prescriptions from effective field theory large-scale structure (EFTofLSS), against a hybrid approach based on Lagrangian perturbation and high-resolution simulations. These models are benchmarked comoving snapshots Flagship I N-body simulation at $z=(0.9,1.2,1.5,1.8)$, which have been populated with...
We present the results of a set cosmological N-body simulations with standard $\Lambda$CDM cosmology but characterized by scale-dependent primordial non-Gaussianity local type featuring power-law dependence $f_{\rm NL}^{\rm loc}(k)$ at large scales followed saturation to constant value smaller where non-linear growth leads formation collapsed cosmic structures. Such models are built ensure consistency current Cosmic Microwave Background bounds on yet allowing for effects non-Gaussian...
We use $z=1$ mock galaxy catalogues produced with the semi-analytic code GALACTICUS to study dependence of non-Gaussian bias parameter $b_\phi$ on mass assembly history host halos. generate large sets merger trees and measure $\Delta b_\phi$ for galaxies selected by color magnitude emission line luminosities. For $g-r$ color, we find a consistent analysis Barreira et al. (2020) based hydro-dynamical simulations formation. This effect arises from fact that larger value normalization amplitude...
We develop a pipeline to set new constraints on scale-independent modified gravity, from the galaxy power spectrum in redshift space of BOSS DR12. The latter is modelled using effective field theory large-scale structure up 1-loop order perturbation theory. test our synthetic and simulated data, assess systematic biases inferred cosmological parameters due marginalization theoretical errors, we apply it normal branch DGP model with $Λ$CDM background. When applied data simulations, observe...
A new and promising avenue was recently developed for analyzing large-scale structure data with a model-independent approach, in which the linear power spectrum shape is parametrized large number of freely varying wavebands rather than by assuming specific cosmological models. We call this method FreePower. Here we show, using Fisher matrix that precision case one-loop greatly improved inclusion tree-level bispectrum. also show accuracy can be similarly employing perturbation theory kernels...
We investigate the approximations needed to efficiently predict large-scale clustering of matter and dark halos in beyond-$Λ$CDM scenarios. examine normal branch Dvali-Gabadadze-Porrati model, Hu-Sawicki $f(R)$ a slowly evolving energy, an interacting energy model massive neutrinos. For each, we test for perturbative kernel calculations, including omission screening terms use kernels based on Einstein-de Sitter universe; explore different infrared-resummation schemes, tracer bias models...