Dear Colleagues,

We would like to invite you to the following seminar that will take place 
on March 31 at 14.30 at the Math Department of Padova. 
The seminar will be held  in person and online via the Zoom platform.

The organizers,

Alessandra Bianchi, Giorgia Callegaro, Marco Formentin
_____________________________________________________

Speaker: Nicola Turchi (Università Milano Bicocca)

Title:  High-dimensional random polytopes of the Beta kind

Date and time:  Friday, MARCH 31 at 14.30 
Place: room 1BC45 at the Department of Mathematics, University of Padova
Zoom link: https://unipd.zoom.us/j/82935460505  (Meeting ID 829 3546 0505)
available also on the webpage  https://www.math.unipd.it/~bianchi/seminari/

Abstract: Beta polytopes are a class of random polytopes, which arise as convex hulls of independent random points distributed according to a certain radially-symmetric probability distribution supported on the Euclidean ball, called the beta distribution.
A prominent reason for the interest surrounding them is that the beta distribution exhibits peculiar properties that make exact computations possible to achieve, contrarily to most other models of randomness with non-independent coordinates.
As the space dimension grows, the expected fraction of the volume that these polytopes fill within their supporting balls can be asymptotically negligible or not, depending on the number of points which are picked in each dimension.
In this talk we give an overview on how to quantify this statement, first showing a rough threshold for the aforementioned growth and secondly a more precise one, namely how many points are needed to get any fraction in average. Lastly, we show how we can handle more precise asymptotics for the approach towards zero in the lower regimes of points, based on a work in progress with G. Bonnet and Z. Kabluchko.

--
Alessandra Bianchi
Dip. di Matematica
Università di Padova

Via Trieste, 63 - 35121 Padova, Italy

phone:    +39 049 827 14 06
fax:        +39 049 827 14 28
e-mail:    bianchi@math.unipd.it
http://www.math.unipd.it/~bianchi/