18 citations · 67 across the 17 of their papers we have counts for
17 papers
Beyond Explained Variance: A Cautionary Tale of PCA
Gionni Marchetti
We address shortcomings of principal component analysis (PCA) for visualizing high-dimensional data lying on a nonlinear low-dimensional manifold via two-dimensional scatterplots,…
Learning the Intrinsic Dimensionality of Fermi-Pasta-Ulam-Tsingou Trajectories: A Nonlinear Approach using a Deep Autoencoder Model
Gionni Marchetti
We address the intrinsic dimensionality (ID) of high-dimensional trajectories, comprising data points, of the Fermi-Pasta-Ulam-Tsingou (FPUT) model with $N…
Metric Similarity and Manifold Learning of Circular Dichroism Spectra of Proteins
Gionni Marchetti
We present a machine learning analysis of circular dichroism spectra of globular proteins from the SP175 database, using the optimal transport-based -Wasserstein distance $\math…
A Machine Learning Tool to Analyse Spectroscopic Changes in High-Dimensional Data
Alberto Martinez-Serra, Gionni Marchetti, Francesco D'Amico +4
When nanoparticles (NPs) are introduced into a biological solution, layers of biomolecules form on their surface, creating a corona. Understanding how the structure of the protein…
Intrinsic Dimensionality of Fermi-Pasta-Ulam-Tsingou High-Dimensional Trajectories Through Manifold Learning: A Linear Approach
Gionni Marchetti
A data-driven approach based on unsupervised machine learning is proposed to infer the intrinsic dimension of the high-dimensional trajectories of the Fermi-Pasta-Ulam-T…
Generalized Naming Game and Bayesian Naming Game as Dynamical Systems
Gionni Marchetti
We study the -model (-NG) and the Bayesian Naming Game (BNG) as dynamical systems. By applying linear stability analysis to the dynamical system associated with the -model…
Revisiting the Thomas-Fermi Potential for Three-Dimensional Condensed Matter Systems
Gionni Marchetti
We proposed a formally exact, probabilistic method to assess the validity of the Thomas-Fermi potential for three-dimensional condensed matter systems where electron dynamics is co…
Electron-electron Scattering in the Diffusive Regime and Dyakonov-Perel Theory: a case study of spin decoherence in n-type GaAs
Gionni Marchetti
We argue that in the ensemble Monte Carlo approach, the spin decoherence caused by electron-electron interactions in n-type bulk GaAs at room temperature, according to Dyakonov-Per…
Machine Learning S-Wave Scattering Phase Shifts Bypassing the Radial Schrödinger Equation
Alessandro Romualdi, Gionni Marchetti
We present a proof of concept machine learning model resting on a convolutional neural network capable to yield accurate scattering s-wave phase shifts caused by different three-di…
The Role of bilinguals in the Bayesian naming game
Gionni Marchetti, Marco Patriarca, Els Heinsalu
We study the recently introduced Bayesian naming game model, in which the one-shot learning of the minimal naming game is replaced by a more realistic learning process defined acco…
A Bird's-Eye View of Naming Game Dynamics: From Trait Competition to Bayesian Inference
Gionni Marchetti, Els Heinsalu, Marco Patriarca
The present contribution reviews a set of different versions of the basic naming game model, differing in the underlying topology or in the mechanisms regulating the interactions b…
A Bayesian Approach to the Naming Game Model
Gionni Marchetti, Marco Patriarca, Els Heinsalu
We present a novel Bayesian approach to semiotic dynamics, which is a cognitive analogue of the naming game model restricted to two conventions. The one-shot learning that characte…
Single-particle Relaxation Time in Doped Semiconductors beyond the Born Approximation
Gionni Marchetti
We compare the magnitudes of the single-particle relaxation time accurately computed by the variable phase approach are with those computed in the first Born approximation for dope…
Inconsistency between Linearized Thomas-Fermi Approximation and Electron-Ionized Impurity Scattering Rate in the first Born Approximation
Gionni Marchetti
We show that by computing the electron-impurity scattering rate at the first order via Fermi's golden rule, and assuming that the localized impurity potential is of Yukawa form, on…
Spin Relaxation in GaAs: Importance of Electron-Electron Interactions
Gionni Marchetti, Matthew Hodgson, James McHugh +2
We study spin relaxation in n-type bulk GaAs, due to the Dyakonov--Perel mechanism, using ensemble Monte Carlo methods. Our results confirm that spin relaxation time increases with…
Effect of Ionized Impurity Screening on Spin Decoherence at Low and Intermediate Temperatures in GaAs
Gionni Marchetti, Irene D'Amico
We study the effect of charged impurity screening on spin decoherence in bulk {\it n}-type GaAs, and analyse in details the effect of the use of different Born approximations appli…
Spin decoherence in n-type GaAs: the effectiveness of the third-body rejection method for electron-electron scattering
Gionni Marchetti, Matthew Hodgson, Irene D'Amico
We study the spin decoherence in n-type bulk GaAs for moderate electronic densities at room temperature using Ensemble Monte Carlo method. We demonstrate that the third-body reject…