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”A study of Veronica spicata and V. longifolia (Plantaginaceae) and their putative hybrid in the Oslo area”

David Mota, ITA

Several extensions of the standard cosmological model include scalar fields as new degrees of freedom in the underlying gravitational theory. A particular class of these scalar field theories include screening mechanisms intended to hide the scalar field below observational limits in the solar system, but not on galactic scales, where data still gives freedom to find possible signatures of their presence.  I describe how one can use structure formation to study screening mechanisms in extensions to General Relativity. In particular, I will present observable signatures of modified gravity in the nonlinear matter power spectrum, on the halo mass function and other properties of galaxy clusters. Those would help us to discriminate between models with and without scalar fields and even between different screening mechanisms.

(The slides are now available)

Dear all CEES members: We are pleased to invite you to the Annual CEES Conference.

UPDATE: Download the Program (pdf)

Prof. Alan Gelfand (Duke University, Dept. of Statistical Science) will give a seminar in room 108, ground floor N.H. Abel's Building at 15:15 October 13th.

Prof. Mike West (Duke University, Dept. of Statistical Science) will give a seminar in room 108, ground floor N.H. Abel's House at 14:15 October 13th.

Heïdi Sevestre at the Department of Geosciences will be defending her dissertation: Surge-type glaciers: controls, processes, distribution

Doctoral candidate Heïdi Sevestre at the Department of Geosciences will give a trial lecture on the given topic: Ice sheets, glaciers and sea-level rise

Ingrid Hobæk Haff is giving her inaugural lecture with the title: Parameter estimation for pair-copula constructions.

Sven Wedemeyer, Researcher - Institute of Theoretical Astrophysics

Upcoming short presentation from MSc/PhD students in meteorology and oceanography:

Speaker: Helen Yeung

Title: Analysis of ENSO signal in the stratosphere in WACCM simulations

Supervisor: Frode Stordal

This week we will discuss a paper on how hybridization may boost adaptive radiations in sticklebacks. The paper is authored by Roy and co-authors and is available from the recently accepted papers section in Molecular Ecology.

Mathematical Institute, University of Oxford

Rafael Rodríguez Ochoa at the Department of Geosciences will be defending his dissertation: Risk Analysis of Earthquake-Induced Submarine Landslides in Deepwater Sites

Doctoral candidate Rafael Rodríguez Ochoa at the Department of Geosciences will give a trial lecture on the given topic: Mechanisms of pore pressure generation in marine sediments and its implications for offshore geohazards

Friday seminar by Chris Thomas from Department of Biology, University of York, UK

Steven Mueller at the Department of Geosciences will be defending his dissertation: Stratigraphy and Depositional Environments of the Boreal and Tethyan Early Carnian (Triassic) – Evidenced by Palynology and Geochemistry

Geir Ellingsrud, Professor, Mathematics Department, UiO 

The Ordovician crew is in town and we plan to capitalize on their knowledge. In journal club this week, we will read a paper by Hughes et al. in PNAS from 2013  "Clades reach highest morphological disparity early in their evolution". 

Doctoral candidate Steven Mueller at the Department of Geosciences will give a trial lecture on the given topic: The Toarcian Oceanic Anoxic Event  - causes and implications

Martin Gulbrandsen, UiS, gives the Seminar in Algebra and Algebraic Geometry

The dual cell complex of Hilbert scheme degenerations  

Upcoming short presentation from MSc/PhD students in meteorology and oceanography:

Speaker: Hui Tang

Title: Dynamical vegetation model in NorESM

This week we will discuss a paper on how chromosomal rearrangements and hybridization between two yeast lineages drive hybrid speciation after secondary contact. The paper is authored by Leducq and co-authors and is available from BioRxiv, a bit fresher than most papers we read and hopefully with plenty of scope for discussion.

Judith Packer, University of Colorado (Boulder), USA, will give a talk with title: Wavelets associated to representations of higher-rank graph C*-algebras

Abstract: Let $\Lambda$ denote a finite $k$-graph in the sense of A. Kumjian and D. Pask that is strongly connected, and let $\Lambda^{\infty}$ denote its infinite path space. I discuss some recent joint work with C. Farsi, E. Gillaspy, and S. Kang, where we construct a system of functions that we call ``wavelets" on a Hilbert space of square-integrable functions on $\Lambda^{\infty}.$ In so doing, we generalize work of M. Marcolli and A. Paolucci for finite directed graphs to the higher rank case. The key tool is the construction of a representation of the graph $C^*$-algebra $C^{\ast}(\Lambda)$ on $L^2(\Lambda^{\infty},M)$ for the appropriate measure $M.$ When the finite $k$-graph $\Lambda$ in question is strongly connected and aperiodic, the representation of $C^{\ast}(\Lambda)$ that we obtain is faithful.