HIP NEWS November 2nd 2015
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HIP Staff News
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Dr. Jaakko Härkönen has been appointed by the Xiangtan University
(PR China) as a honorary professor for the period 2015-2017.
HIP Detector Laboratory informs
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20 doctoral students from Nordic countries will visit HIP Detector Laboratory for research training course in detector technology for particle physics during 2-6.11.2015.
DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 3 November 2015 at 10.15 in A315
Lene Bryngemark (Lund)
Search for physics beyong the Standard Model using dijet distributions in ATLAS
Abstract: The LHC gives us access to the highest collider energies, at the highest intensities, providing a unique opportunity to thoroughly examine the constituents of matter and their interactions at ever smaller distances and higher mass scales. Produced in the strong — or a new, previously unseen — interaction, jets probe the very energy frontier. With the recent increase in LHC beam energy, ATLAS makes use of this sensitivity to make its first statements of what physics looks like in a new energy regime. In this presentation I show the results from both the 8 and the more recent 13 TeV analysis of dijet mass and angular distributions.
COSMO-Seminar
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Wednesday 4 November at 14:15 in A315
Michael Joyce (UPMC, Paris)
Non-linear structure formation in scale free cosmological models
Abstract: Calculation of the clustering of matter in the universe in different cosmological models, even in the approximation that all but gravitational forces are neglected, relies essentially on numerical simulations which use the N body method. The physics of this non-linear clustering remains poorly understood, and there are also open questions about the resolution/precision of simulations. After a brief overview of these issues, I will discuss them in the framework of a particularly simple class of “scale-free” cosmological models, which have the interest of providing a very simple diagnostic for determining resolution, and also some simple analytical predictions for clustering. We explore using these models, in both one and three dimensions, two questions which turn out to be intimately linked to the issue of numerical resolution: the relevance of the stable clustering approximation in the strongly non-linear regime, and the dependence of halo profiles on cosmology and initial conditions.
DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Thursday 5 November 2015 at 10.15 in A315
David Daverio (Geneva)
Large scale structure formation within a general relativistic framework
Abstract: One century after the conception of General Relativity (GR), there is still a large pool of predictions we still have difficulties to get. Indeed, to give only one example, large scale structure formation is still simulated within a Newtonian framework. This framework, even well suited for cosmology as it can be understood as a week field quasi static approximation of GR, does not take into account the propagating degree of freedom of GR and is not well suited to include relativistic sources such as neutrinos. Recently, the first code aiming to simulate large scale structure within a general relativistic framework has been developed. This code, gevolution, solves GR in the weak field limit using the approximation scheme proposed in Adamek et al. 2014 and is constructed on top of the framework LATfield2 which manages the particles and provides a scalable parallelisation allowing to run with lattice of 4096^3 cells with one particle per cell on 16k processes. In this talk we will discuss the method used to develop this code and first results of cold dark matter simulation will be presented.
Visitors
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D. Daverio 25.10. – 6.11. (KR)
M. Joyce 3.11. – 5.11. (ML)