Settimana 29/01/2024 - 02/02/2024

 

• Seminari

• Eventi

• Archivio Bollettini

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Seminari

 

Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

 

Colloquium interdipartimentale

Date: 5th February 2024

Schedule: 14:30 - Rome Time

Where: Room L3 - Macroarea di Scienze -

Title: " CME arrival Modelling with Machine Learning "

Speaker: Simone Chierichini - School of Mathematics and Statistics, Univ. of Sheffield, UK; Depth. of Fisica, Univ. di Roma "Tor Vergata

Abstract: Space weather phenomena have long captured the attention of the scientific community and, along with the recent technological developments, the awareness that such phenomena can interfere with human activities on Earth has grown considerably. Coronal Mass Ejections (CMEs) are among the main drivers of space weather. Therefore developing tools to provide information on their arrival at Earth’s nearby space became increasingly important. Liu et al. (2018) developed a tool, called CAT-PUMA, to obtain fast and accurate predictions of CME transit time. This present work aims at the expansion of the CAT-PUMA concept, employing Supervised Learning to obtain vital information about the arrival of CMEs at Earth. In this study, we report the results of our work following the implementation of supervised regression and classification models in the CAT-PUMA framework. We conducted a comparison of various machine learning models in the context of predicting the transit time of CMEs and classifying CMEs as either Earth-impacting or non-impacting. In this way, we are able to provide information on the possibility of a CME reaching Earth relying on CME features and solar wind parameters measured at take-off. This application thus provides quantitative indications about the geo-effectiveness of these space weather events. While machine learning models can demonstrate a fairly strong performance in regression and classification tasks, it is not always ways straightforward to extrapolate their practical potential and real-world applicability. To address this challenge, we employed model interpretation techniques, specifically Shap Values, to gain quantitative insights into the limitations that affect these models.

Organizing Committee:
Gianfranco Bocchinfuso (Dip. di Scienze e Tecnologie Chimiche)
Michele Buzzicotti (Dip. di Fisica)
Dario Del Moro (Dip. di Fisica)
Ugo Locatelli (Dip. di Matematica)
Blasco Morozzo Della Rocca (Dip. di Biologia)

Further Info:

Streaming Link (MS Teams): This seminar will be held in person

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Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

 

Geometry Seminar

Date: 6th February 2024

Schedule: 14:30 - Rome Time

Where: Conference Room 1101 "C. D'Antoni"

Title: " Some examples of Ulrich sheaves "

Speaker: Roberto Vacca - Università di Roma "Tor Vergata" -

Abstract: In this talk we will introduce Ulrich sheaves on projective algebraic varieties. The corresponding notion for modules over rings originated from the work of Ulrich, but only after a paper by Eisenbud and Schreyer its geometric side received many attention due to the connection with determinantal and Pfaffian representations of (Chow forms of) varieties. The main questions are existence of such sheaves and, if so, their minimal rank. Positive answer to the first question is known for curves, surfaces (up to change of polarization), Veronese varieties, Segre varieties and complete intersections. Outside those examples, very few is known in dimension at least 3; therefore we will focus on Fano 3-folds.

This talk is part of the activity of the MIUR Excellence Department Projects MathMod@TOV, and the PRIN 2022 Moduli Spaces and Birational Geometry

Organizing Committee:
Giulio Codogni (mail to contact)
Guido Maria Lido (mail to contact)

Further Info: Click here for Geometry Page

Streaming Link (MS Teams): This seminar will be held in person

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Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

 

DIFFERENTIAL EQUATIONS SEMINAR

Date: 6th February 2024

Schedule: 16:00 - Rome Time

Where: Conference Room "R. Dal Passo"

Title: " "

Speaker: Margherita Nolasco - Università dell'Aquila

Abstract:

Nota: Questo seminario fa parte delle attività finanziate dal progetto MIUR Dipartimento d'eccellenza MATH@TOV CUP E83C23000330006
Note: This talk is part of the activity of the MIUR Excellence Department Project MATH@TOV CUP E83C23000330006

Organizing Committee:
Riccardo Molle (mail to contact)
Alfonso Sorrentino (mail to contact)

Further Info and Program: Click here

Streaming Link (MS Teams): This seminar will be held in person

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Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

 

RoMaDS - Rome Centre on Mathematics for Modelling and Data ScienceS

Date: 8th February 2024

Schedule: 15:00 - Rome Time

Where: Conference Room "R. Dal Passo"

Title: " Conformally invariant random fields, quantum Liouville measures, and random Paneitz operators on Riemannian manifolds of even dimension "

Speaker:

Abstract:
On large classes of closed even-dimensional Riemannian manifolds M, we construct and study the Copolyharmonic Gaussian Field, i.e. a conformally invariant log-correlated Gaussian field of distributions on M. This random field is defined as the unique centered Gaussian field with covariance kernel given as the resolvent kernel of Graham—Jenne—Mason—Sparling (GJMS) operators of maximal order. The corresponding Gaussian Multiplicative Chaos is a generalization to the 2m-dimensional case of the celebrated Liouville Quantum Gravity measure in dimension two. We study the associated Liouville Brownian motion and random GJMS operator, the higher-dimensional analogues of the 2d Liouville Brownian Motion and of the random Laplacian. Finally, we study the Polyakov–Liouville measure on the space of distributions on M induced by the copolyharmonic Gaussian field, providing explicit conditions for its finiteness and computing the conformal anomaly.
(arXiv:2105.13925 , joint work with Ronan Herry, Eva Kopfer, Karl-Theodor Sturm)

Nota: Questo seminario fa parte delle attività finanziate dal progetto MIUR Dipartimento d'eccellenza MATH@TOV CUP E83C23000330006
Note: This talk is part of the activity of the MIUR Excellence Department Project MATH@TOV CUP E83C23000330006

Organizing Committee:
Domenico Marinucci (coordinator) (mail to contact)
Michele Salvi (mail to contact)
Stefano Vigogna (mail to contact)

Further Info and Program: Click here for RoMaDS event Page

Streaming Link (MS Teams): This seminar will be held in mix mode: in person and in streaming - this is MICROSOFT TEAMS LINK

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Eventi

 

Università degli Studi di Roma "Tor Vergata"
Dipartimento di Matematica

PhD Course
Computational Topology and Topological Data Analysis
Period: 16.01.24 - 15.02.24
Schedule:

Day	Time and Room
16.01.24	h:14:30/16:30 Conference Room 1200
18.01.24	h:14:30/16:30 Conference Room 1200
23.01.24	h:14:30/16:30 Conference Room 1200
25.01.24	h:14:30/16:30 Conference Room 1101 "C. D'Antoni"
30.01.24	h:14:30/16:30 Conference Room 1200
01.02.24	h:14:30/16:30 Conference Room 1200
06.02.24	h:14:30/16:30 Conference Room 1200
08.02.24	h:14:30/16:30 Conference Room 1200
13.02.24	h:14:30/16:30 Conference Room 1200
15.02.24	h:14:30/16:30 Conference Room 1200

Organizing Committee:
Sara Scaramuccia (Contact Mail)

Further Information: Click here for Phd Course Page and

Streaming Link (MS Teams): This seminar will be held in person

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