# Lectures, seminars and dissertations

* Dates within the next 7 days are marked by a star.

Aristides Gionis (Aalto University)

**Mining temporal networks**

*** ** Tuesday 19 December 2017, 10:15, U3

Further information

Stochastic Sauna 2017 / Kytölä, Leskelä, Radnell, Webb

Lauri Viitasaari (University of Helsinki)

**On model fitting and estimation of stationary processes**

*** ** Tuesday 19 December 2017, 11:15, U3

Further information

Stochastic Sauna 2017 / Kytölä, Leskelä, Radnell, Webb

Dr David Cushing (Durham University)

**Ollivier-Ricci idleness functions of graphs**

*** ** Tuesday 19 December 2017, 12:15, M2 (M233)

Ricci curvature plays a very important role in the study of Riemannian manifolds. In the discrete setting of graphs, there is very active recent research on various types of Ricci curvature notions and their applications. One such notion on graphs is the Ollivier-Ricci curvature. This notion has recently had many applications, ranging from modelling cancer growth to modelling WiFi connections. This stems from this curvature notion being a way to quantify local connectedness.
Ollivier-Ricci curvature is motivated by optimal transport. I will begin by giving a crash course on optimal transport theory and defining Ollivier-Ricci curvature on graphs.
Then we will study the Ollivier-Ricci curvature of graphs as a function of the chosen idleness. We show that this idleness function is concave and piecewise linear with at most 3 linear parts, with at most 2 linear parts in the case of a regular graph. We then apply our result to show that the idleness function of the Cartesian product of two regular graphs is completely determined by the idleness functions of the factors.

Discrete geometry seminar / Kangaslampi

Roland Bauerschmidt (University of Cambridge)

**Eigenvectors and spectral measure of random regular graphs of fixed degree**

*** ** Tuesday 19 December 2017, 13:30, U3

Further information

Stochastic Sauna 2017 / Kytölä, Leskelä, Radnell, Webb

Mikko Pakkanen (Imperial College London)

**Rough volatility: towards efficient Monte Carlo pricing and calibration**

*** ** Tuesday 19 December 2017, 14:30, U3

Further information

Stochastic Sauna 2017 / Kytölä, Leskelä, Radnell, Webb

Eveliina Peltola (University of Geneva)

**Multiple SLEs for \kappa \leq 4**

*** ** Tuesday 19 December 2017, 15:45, U3

Further information

Stochastic Sauna 2017 / Kytölä, Leskelä, Radnell, Webb

Timmavajjula Venkata Karthik (IISER)

**Symmetric group action on the cohomology algebra of configuration space of particles in R^3**

*** ** Wednesday 20 December 2017, 14:15, M3 (M234)

We first give a brief introduction to the physics of the problem followed by descriptions of the cohomology algebra(H_n^∗) and the action of the symmetric group Σ_n on it, accompanied by computations for a few values of n. Then we get to our main aim which is: Determining the multiplicity(μ_{k,d,n}) of the k:th hook representation of S_n in H_n^d, by describing the Hook representations, Lehrers generating function method for computing characters of both representations of symmetric group on the algebra as well as that of Hook representations. Finally, using combinatorial techniques such as Moreau's Necklace counting function and the cyclotomic identity, we determine μ_{0,d,n}, μ_{n−1,d,n} and finally the general case μ_{k,d,n}.

Kytölä / Radnell

Mindaugas Bloznelis (U Vilnius)

**TBA**

Monday 22 January 2018, 15:15, M3 (M234)

Aalto Stochastics & Statistics Seminar

Jouni Parkkonen (University of Jyväskylä)

**TBA**

Wednesday 24 January 2018, 12:15, M3 (M234)

Seminar on analysis and geometry

Ratan Kumar Giri (National Institute of Technology Rourkela, India)

**Reduced limit corresponding to the second order semilinear elliptic PDEs with measure data**

Wednesday 07 February 2018, 12:15, M3 (M234)

Seminar on analysis and geometry

Jung-Tae Park (Seoul National University)

**Global gradient estimates for measure data problems in nonsmooth domains**

Wednesday 21 February 2018, 12:15, M3 (M234)

Seminar on analysis and geometry

Sebastian Schwarzacher (University of Bonn)

**TBA**

Wednesday 07 March 2018, 12:15, M3 (M234)

Seminar on analysis and geometry

Sylvester Eriksson-Bique (UCLA)

**TBA**

Wednesday 21 March 2018, 12:15, M3 (M234)

Seminar on analysis and geometry

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