Previous events - Page 258

2-day conference on the history of plague, at the Norwegian Academy of Science and Letters, with summarizing thoughts of Jared Diamond. Please register.

Jan Fredrik Bjørnstad (Statistics Norway and Dept. of Math.,UiO) gives a seminar in room 107, 1st floor N.H. Abels House at 14:15 November 18th: Survey sampling the way I see it.

This is a work we had done jointly with Garkusha (after Voevodsky) arXiv:1409.4372. Using the machinery of framed sheaves developed by Voevodsky, a triangulated category of framed motives is introduced and studied. To any smooth algebraic variety X in Sm/k, the framed motive M_fr(X) is associated in that category . Also, for any smooth scheme X in Sm/k an explicit quasi-fibrant motivic replacement of its suspension P1-spectrum is given. Moreover, it is shown that the bispectrum (M_fr(X),M_fr(X)(1),M_fr(X)(2), ... ), each term of which is a twisted framed motive of X, has motivic homotopy type of the suspension bispectrum of X. We also construct a compactly generated triangulated category of framed bispectra SH_fr(k) and show that it reconstructs the Morel-Voevodsky category SH(k). As a topological application, it is proved that the framed motive M_fr(pt)(pt) of the point pt = Speck evaluated at pt is a quasi-fibrant model of the classical sphere spectrum whenever the base field k is algebraically closed of characteristic zero.   

Late lunch talk by Melissah Rowe

The goal of this talk is to present some recent computations of the Picard groups of several spectra of topological modular forms. The first part of the talk will introduce the toolbox, which consists of descent theory and a technical lemma allowing us to compare stable and unstable information in spectral sequences. This is joint work with Akhil Mathew.   

Friday seminar by Annelise Binois 

Welcome to the GeoHyd Lunch Seminar on Friday 14 November @12:15 in AUD 1 in the Geology building.

This week we will discuss a paper entitled "Maximum likelihood inference of reticulate evolutionary histories" by Yu and co-authors from PNAS. The paper presents a new method for inferring reticulate evolutionary histories while accounting for incomplete lineage sorting.

Yoshiaki Kato,Postdoctoral Fellow , ITA

Nanoparticle-based delivery of efflux pump inhibitors and antibiotics to treat mycobacterial infections

Tore Selland Kleppe (University of Stavanger) gives a seminar in room 107, 1st floor N.H. Abels House at 14:15 November 11th: Bandwidth Selection In Pre-Smoothed Particle Filters

In a second edition of TGAC-with-original-authors, we'll discuss Marcussen et al. (2014), a recent Science paper on ancient hybridization of polyploid wheat genomes. The first author Thomas Marcussen will join our discussion, and since Kjetill Jakobsen was involved in the study, we may even have two authors present to answer all our questions. We're switching back to the old meeting time, starting at 1 pm.

Yasser Roudi, Group Leader, Kavli Institute for Systems Neuroscience / Centre for Neural Computation, NTU

This week we'll be discussing a box fresh paper by Tanja Stadler and co-workers in American Naturalist: On Age and Species Richness of Higher Taxa

This week we will discuss another weird group of parasites within the opisthokonts, the myxozoans. They are a strange group of microscopic sized metazoans related to the Cnidaria, and are found in aquatic habitats where they act as parasites of fish, amphibians, reptiles and rarely invertebrates.

Ivica Picek, Univ. of Zagreb

After the discovery of the Higgs boson, searching for the dark matter (DM) is one of the main targets for the LHC. In light of evidence for neutrino mass it would be appealing that DM particles account for a solution to the small neutrino mass. A radiative neutrino mass realization dubbed  "scotogenic" (with DM particles in a loop) imposes an exactly conserved Z_2 symmetry to eliminate tree-level neutrino masses and to simultaneously stabilize a DM candidate.

In this talk I will discuss the possibility to avoid such ad hoc Z_2 symmetry: either by promoting it to a local gauge U(1)_D symmetry or by requiring that it arises "accidentally" (on account of the SM symmetry and a choice of the field content). In this context, I will discuss the testability of Majorana singlet, triplet  and quintet DM candidates at the LHC.

This Thursday (6th of November) we will talk more about Illumina sequencing. The paper from last time that compares Illumina with Ion Torrent (Salipante et al. 2014) will be discussed this week.  We also want to discuss a paper that have used the Illumina platform to look at microbial community composition and diversity (Sinclair et al. 2014).

Marco Matassa (UiO) will give a talk with title: Dirac Operators on Quantum Flag Manifolds

Abstract: I will review the paper "Dirac Operators on Quantum Flag Manifolds" by Ulrich Krähmer. The aim is to define Dirac operators on quantized irreducible flag manifolds. These will yield Hilbert space realizations of some distinguished covariant first-order differential calculi.

Alejandro Ibarra, Technische Universität München [slides]

The search for the gamma-rays which are presumably produced in dark matter annihilations is hindered by the existence of large, and still poorly understood, astrophysical backgrounds. In this talk we will emphasize the importance of sharp spectral features for the identification of a dark matter signal. We will review the status of the search of the various spectral features that arise in Particle Physics scenarios and we will discuss the interplay with other search strategies.

Friday seminar by Thomas Marcussen

Piyali Chatterjee,Postdoctoral Fellow , ITA

”Acoustic startle responses in European sprat (Sprattus sprattus L.) and diploid versus triploid Atlantic salmon fry (Salmo salar L.)”

Pat Scott , Imperial College London [slides]

Searches for particle physics beyond the Standard Model come in many forms, from searches for new particles at accelerators to gamma-ray and neutrino telescopes, cosmic ray detectors and ultra-clean experiments deep underground.  Efforts to combine multiple search channels in 'global fits' to new physics scenarios typically consider only a subset of the available channels, and apply them to a very small range of possible theories. Astroparticle searches in particular are usually only included in a very approximate way, if at all.  In this talk I will review recent progress in improving this situation, and preview some of the future developments and challenges in this field.

In a sort of a special edition of the TGAC journal club, we hope to finally find out whether Thor Heyerdahl was right after all with his claims regarding early contact between the cultures of South America and Easter Island, whether his Kon-Tiki expedition in 1947 was just a fun cruise across the Pacific without any scientific substantiation, or whether genomic data actually supports his ideas. We will find the answers in the very recent paper by Moreno-Mayar et al. (2014), which just came out in Current Biology and comes with a commentary in Science. Four of the authors are working at the University Hospital here in Oslo, and at least two of them will join our discussion!

As there will be a CELS meeting this Tuesday at 1 pm, the TGAC discussion will be earlier than usual, at 11 am.