Events - Page 18

Time and place: Aug. 24, 2015 12:15 PM1:00 PM, Seminar room (FV414)

Semih Turkaya (Institut de Physique du Globe de Strasbourg, France) will present us his PhD work done with his coauthors  Renaud Toussaint, Fredrik Kvalheim Eriksen, Megan Zecevic, Guillaume Daniel, Eirik G. Flekkøy, and Knut Jørgen Måløy.

Time and place: Aug. 23, 2015Aug. 30, 2015, Crete

The conference aims to promote scientific exchange and the development of novel ideas, with a particular emphasis on interdisciplinarity.

Time: Aug. 21, 2015 10:15 AM4:00 PM

Trial lecture title: Anomalous Diffusion: From Condensed Matter and Biological Systems to Financial Markets

Dissertation title: Modelling the onset of frictional sliding: Rupture fronts, slow slip, and time-dependent junction laws

Time and place: Aug. 19, 2015 1:05 PM, Ø467

Yong Tang, KIAS

This talk will discuss some possible connections between neutrinos and dark matter, in light of astrophysical observations. Contents include self-interacting dark matter, sterile neutrinos and IceCube Events. 

The slides are now available.

Time and place: Aug. 10, 2015 12:15 PM1:00 PM, PGP seminar room (V414, Physics building)

Hong-Yan Shih, PhD student at University of Illinois at Urbana-Champaign, willl give a talk on "The emergence of collective modes, ecological collapse and directed percolation at the laminar-turbulence transition in pipe flow​".

Time and place: June 24, 2015 1:05 PM, Ø467

Kalliopi Petraki, NIKEF Amsterdam [slides]

Observations of the galactic and sub-galactic structure of our universe suggest that a shift from the collisionless cold dark matter paradigm may be needed. Dark matter with sizable self-interactions offers a compelling explanation of these observations.

Particle​ ​physics models of self-interacting dark matter can be well accommodated within the asymmetric dark matter scenario. Asymmetric dark matter hypothesizes that the relic dark​ ​matter abundance is due to an excess of dark particles over antiparticles, and allows for sizable and direct couplings of dark matter to light force mediators.

In addition, the dark particle-antiparticle asymmetry may be related to the baryon asymmetry of the universe, thus offering a dynamical explanation for the similarity of the dark and the ordinary matter abundances. Exploring the low-energy phenomenology of self-interacting asymmetric dark matter, including the effect on the dynamics of dark matter halos and possible detection strategies, presupposes understanding the cosmology of these models, which can be quite involved. I will discuss the above, and illustrate them in the context of the atomic dark matter model.

Time and place: June 18, 2015 9:15 AMJune 19, 2015 5:00 PM, Lille Fysiske Auditorium (FV232), Physics Building, UiO

On June 18th and 19th, the “kick-off” seminar for the Strategic Research Intitiative EarthFlows will be arranged in Oslo.

Time and place: June 12, 2015 3:15 PM4:00 PM, Seminar room (FV414)

Talk by François Renard (ISTerre, Univ. Grenoble Alpes & PGP, UiO) in relation with the EarthFlow project, but addressed to a broad audience.

Time and place: June 5, 2015 3:15 PM4:00 PM, PGP-CM seminar room (V414)

Thema 1 of the EarthFlow project will be presented by Olivier Galland (PGP, UiO), Atle Jensen (Department of Mathematics, UiO) and Martin Dabrowski (PGP, UiO).

 

Time and place: June 3, 2015 1:05 PM, Ø467

Kai Schmidt Hoberg, DESY, Hamburg [slides]

I will review motivations for the existence of self interacting dark matter and discuss possible astrophysical observables. Self-interactions of dark matter particles can potentially lead to an observable separation between the dark matter halo and the stars of a galaxy moving through a region of large dark matter density. Such a separation has recently been observed in a galaxy falling into the core of the galaxy cluster Abell 3827. I discuss the DM self-interaction cross section needed to reproduce the observed effects.

Time and place: May 29, 2015 3:15 PM4:00 PM, V 414

Are you also curious to know what research is brewing on the other side of the hall in PGP-AMKS group? We are launching a new Friday seminar event, the Poster Friday, with the first time coming Friday. Please join us, where we kick off this first session with posters involving flow in porous media, microfluidics, visco-elasticity and many things more!  

Time and place: May 29, 2015 1:00 PM2:30 PM, Aud. 467, Theory section

The research centre for dark matter, The Strategic Dark Matter Initiative - SDI, will officially be launched on Friday, and invites you all to a popular science lecture, with coffee and snacks.

Time and place: May 27, 2015 1:05 PM, Ø467

Thomas Jacques, Université de Genève, Switzerland [slides]

As beyond-standard-model physics continues to elude discovery at the LHC, it becomes increasingly important to ask what we can learn about dark matter in a model-independent way. I will introduce the theory and usage of effective operators; these have become popular in recent years as a way to construct model-independent constraints on dark matter, but at LHC energies it is crucial to understand their significance and limitations, and how they can be used to compare the reach of vastly different experiments. With this in mind, I will also discuss the next step beyond effective operators, and techniques to link the search for missing energy with the much-sought-after Dark Matter.

Time: May 22, 2015 3:15 PM4:00 PM

Yi Jing Phua (Postdoctoral Research Fellow at PGP, UiO) will present us her work on biodegradable polymers.

Time and place: May 13, 2015 1:05 PM, Ø467

Mark Burgess

Physics is probably the most successful science when it comes to describing how things behave, but it avoids interpreting the meaning or the intent of behaviours. In technology, especially IT, meaning and intent are at the top of the list when it comes to description, but IT fails to describe system dynamics convincingly. Promise Theory is an attempt to unify dynamical and semantic descriptions of systems, inspired by the successes of physics - and it sheds an interesting light on both fundamental physics and information science.

Time and place: May 7, 2015 12:15 PM1:00 PM, Lille Fysisk Auditorium

Kim Sneppen (Niels Bohr Institute, Univ of Copenhagen) will give a talk in relation with the EarthFlow project, but addressed to a broad audience.

   

Time and place: Apr. 29, 2015 1:05 PM, Ø467

Thomas Schwetz-Mangold, Stockholms Universitet [slides]

The observation of neutrino oscillations requires that neutrinos have a tiny but non-zero mass. This implies that the Standard Model of particle physics has to be extended in some way beyond its original formulation where neutrinos are massless. We review the present status of neutrino oscillations and give a brief outlook on future developments in the field. We speculate on the implications for physics beyond the Standard Model and discuss the challenges to identify the mechanism responsible for neutrino mass.

Time and place: Apr. 24, 2015 3:15 PM4:00 PM, Seminar room (FV414)

Felix Kohler, postdoc at the Condensed matter physic group (UiO), will give a talk.

Time and place: Apr. 24, 2015 2:15 PM, Ø467

Nils-Erik Bomark, University of Warsaw

Within the MSSM, the heavy stops required to meet the experimental value of the Higgs mass, poses tension with naturalness, the main reason to believe in supersymmetry at LHC scales. This is alleviated in the NMSSM, where especially the possibility of a light singlet-like scalar can easily push the Higgs mass up to the measure value.

The presence of a singlet-like scalar and pseudoscalar gives rise to LHC phenomenology potentially rather different from the MSSM as these particles can be very light without coming in conflict with observations. In this presentation I will discuss the discovery prospects of these light pseudoscalars in the NMSSM. As direct production of such singlet-dominated particles is very difficult, the main focus will be on channels where heavier scalars decay to pairs of pseudoscalars or pseusodscalars and Z bosons. I will demonstrate that the LHC should be capable of probing a large part of the NMSSM parameter space through these channels.

Time and place: Apr. 22, 2015 1:05 PM, Ø467

Carmelo Evoli, Universität Hamburg [slides]

At GeV-TeV energies the propagation of CRs in our Galaxy is diffusive. Current models of galactic propagation are based on a simplified approach for which diffusion is constant and isotropic. In fact, diffusion transport must be described as in-homogenous and anisotropic and experimental data have now reached an accuracy that allows to study such effects.  

In my talk, I will present some of the consequences of adopting realistic diffusion models for the propagation of galactic CRs, and I will show how these models allow a better understanding of local observations and diffusion emissions within an unified framework.

In the second part of my talk, I will focus on antiprotons as a tool to set constraints on DM models.  In particular, I will discuss the uncertainties associated to both standard astrophysical and DM originated antiprotons. I will show on which extent current antiproton data can place tight constraints on DM models, excluding some of those suggested in connection with indirect and direct searches.

Time and place: Apr. 17, 2015 3:15 PM4:00 PM, Seminar room (FV414)

Thomas Schuler, Andi Kaab (Department of Geosciences, UiO) and Anders Malthe-Sørenssen  (Department of Physics, UiO) will give a talk in relation to the EarthFlow project (a new cross-disciplinary Strategic Research Initiative), addressed to a broad audience.

Time and place: Apr. 15, 2015 1:05 PM, Ø467

Marco Cirelli, Saclay, France [slides]

The field of Dark Matter Indirect Detection is in a thriving but somewhat chaotic moment: quite a few hints of possible detection of signals of DM (over a large range of masses and, in general, inferred properties) are confronted with stringent constraints, often based on the same experiments that provide the possible hints. In turn, this spurs a lot of theoretical activity, aimed at phenomenologically analyzing the claims and, perhaps, at embedding them in wider model building. I will briefly review the current status of the searches, mention the most debated hints and sketch the general directions of the theory activity.

Time: Mar. 27, 2015 9:00 AM10:00 AM

Bjørn Vidar Johansen, leader of The Museum of University and Science  History at the University of Oslo, will guide us in the Observatory of the University of Oslo.

Time and place: Mar. 25, 2015 1:05 PM, Ø467

Daniele Gaggero, SISSA, Trieste, Italy  [slides]

In the first part of the talk, after a general introduction on the physics of cosmic rays (CRs), I present a detailed overview on recent results regarding modeling of CR propagation in the Galaxy and in the Heliosphere. In particular I focus on the necessity to go beyond the standard and simplified picture of uniform and homogeneous diffusion, showing that gamma-ray data point towards different propagation regimes in different regions of the Galaxy. I also sketch the impact of large-scale structure on CR observables. Concerning the propagation of the Heliosphere, I mention the necessity to consider a charge-dependent modulation scenario.

In the second part, I discuss several aspects of the recent claim of a gamma-ray excess in the Galactic center region, discussing in particular the interpretation in terms of Dark Matter, compared to other astrophysical interpretations. I will emphasize the interplay between the non-trivial aspects of CR propagation discussed in the first part and the understanding of the GC excess origin. In particular, I will show in detail how the knowledge of the CR transport parameters and solar modulation is crucial to investigate the compatibility with other channels (namely antiprotons) and to provide alternative astrophysical interpretations.

Time and place: Mar. 23, 2015 12:14 PM1:00 PM, PGP-CM seminar room, V414

Jacob Israelachvili, professor in chemical engineering at the University of California Santa Barbara, will give us an account on the history of the ideas, concepts and theories of intermolecular, inter-particle and inter-surface forces. Jacob Israelachvili is visiting PGP in connection with the installation of the Surface Forces Apparatus (SFA), which he has been leading the development of since the 1970s. He is also well known as the author of the book Intermolecular and Surface Forces