Tidigare seminarier
Lyman-alpha as a probe and diagnostic of galaxies
The Lyman-alpha emission line has been recognized for over four decades as a probe of evolving galaxies at the highest redshifts. However, due to its hideously complicated radiation transport, the path between Ly-alpha (the selection criterion) and Ly-alpha (the physically meaningful diagnostic of star-formation) is a rather poorly illuminated. I will overview the corners and cracked paving slabs that make up this path, and what can be -and is being- done fix it. I will first present some detailed studies of Ly-alpha emission from known star-forming laboratory galaxies in the nearby universe.
Diffractive DIS from multiple soft gluon exchange
We present a simple QCD-based model where soft gluon rescattering of final state partons in deep inelastic scattering lead to events with large rapidity gaps and a leading proton. The model successfully describes the most precise HERA data on the diffractive structure function in a wide range of Q^2 and beta.
The vorticity of light in astronomy
Orbital angular momentum of light is a new degree of freedom associated to the electromagnetic field and is connected with optical vortices. This new aspect of light is opening a new era in astronomy, that now needs a deeper knowledge of the nature of light. Starting from Ettore Majorana's latest notes, we will briefly explore new behaviours expected by light in a
plasma and curved spacetime.
Diagnosing Fusion Plasmas at JET Using Neutron Emission Spectrometry
Maria Gatu Johansson and Carl Hellesen will defend their theses in March (defenses on the 26/3 and 31/3, respectively). Since their work is closely related, they will give a joint presentation of their work and results at the division seminar.
Abstract:
Quantum Day
Seminars/workshop on
Foundations of Quantum Physics and Quantum Information
Celsius-Linne lectures
14:00 Celsius lecture
Professor Anton Zeilinger, University of Vienna:
"Quantum Information and the Foundations of Quantum Mechanics".
15:30 Linné lecture
Dr. J. Craig Venter, Rockville, USA:
"From Reading to Writing the Genetic Code".
Production from Giant Gas Fields in Norway and Russia and Subsequent Implications for European Energy Security
Bengt will present his thesis: Production from Giant Gas Fields in Norway and Russia and
Subsequent Implications for European Energy Security.
Global Oil Depletion Report
Roger Bentley has been part of the team writing a report on the evidence of a near-term peak in global oil production for the UK Energy Research Center (UKERC). In total 64 scenarios have been investigated, including the one from Global Energy Systems at Uppsala University. He will present the report, and one statement from the summary is:
A global peak is likely before 2030 and there is a significant risk of a peak before 2020.
KLOE-2: how to do fundamental physics at a low energy facility
Fabio Bossi is the spokesperson of the KLOE2 experiment at DAFNE.
Y-system for Scattering Amplitudes
Abstract: We compute N=4 Super Yang Mills planar amplitudes at strong coupling by considering minimal surfaces in AdS_5 space. The surfaces end on a null polygonal contour at the boundary of AdS. We show how to compute the area of the surfaces as a function of the conformal cross ratios characterizing the polygon at the boundary. We reduce the problem to a simple set of functional equations for the cross ratios as functions
of the spectral parameter. These equations have the form of
Thermodynamic Bethe Ansatz equations. The area is the free energy of
- 1 of 33
- ››