HIP NEWS June 23rd 2014
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Finnish for foreigners: registration for autumn 2014 courses has begun
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https://flamma.helsinki.fi/portal/home/sisalto?_nfpb=true&_windowLabel=contentviewer&contentId=HY321951&lang=en&_pageLabel=content_view
Visitors
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J.S. Kim 24.6. – 28.6. (OL)
HIP NEWS June 16th 2014
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Visitors
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R. Malik 12.6. – 18.6. (AT)
HIP NEWS June 9th 2014
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DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Monday 9 June 2014 at 14.15 in A315
Ioan Ghisoiu (Bern)
Three-loop Debye mass and effective coupling in thermal QCD
Abstract: QCD at finite temperature is afflicted with infrared divergences that can be cured in part in the framework of a dimensionally reduced effective theory, Electrostatic QCD. We determine the three-loop effective parameters of this theory as matching coefficients to full QCD.
Tuesday 10 June 2014 at 10.15 in A315
Aleksi Kurkela (CERN)
Bottom-up thermalization in heavy-ion collisions
Abstract: It is a commonly held belief that weak coupling dynamics are in contradiction with the apparently fast thermalization observed in heavy-ion collisions at RHIC and at the LHC. This belief is based on solely parametric estimates and naturalness arguments in the “Bottom-up?? picture of thermalization of Baier, Mueller, Schiff, and Son. In my talk, I will discuss elevating this parametric picture into a numerical one through simulations in an effective kinetic theory. I discus how the numerical factors play an important role and show that the Bottom-Up scenario results in rapid thermalization at realistic couplings.
COSMO-Seminar
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Wednesday 11 June 2014 at 14:15 in A315
Matti Herranen (NBI,Copenhagen)
Nonequilibrium QFT approach to leptogenesis
The observed baryon asymmetry of the Universe may have been produced dynamically in the very early Universe by a baryogenesis process. Baryogenesis via leptogenesis is among the most prominent candidates for a successfull baryogenesis scenario. For reliable calculations of the baryon asymmetry first principle methods of nonequilibrium quantum field theory are required. We construct a transport theory of leptogenesis based on the Schwinger-Keldysh or Closed Time Path (CTP) formalism of nonequilibrium QFT. The resulting kinetic equations incorporate finite density medium effects and quantum coherence effects and therefore provide a generalization to standard (quantum) Boltzmann equations. We find that the finite density corrections from loop integrals typically lead to an enhancement of the asymmetry. In the resonant regime with nearly degenerate right-handed neutrino masses, our results confirm the general structure of the resonant enhancement of CP-violation, however, novel terms related to flavour oscillations can be important in the dynamics.
Visitors
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I. Ghisoiu 7.6. – 11.6. (AV)
M. Herranen 9.6. – 11.6. (SR)
M. Hindmarsh 22.4. – 15.6. (KR)
A. Kurkela 9.6. – 12.6. (KR)
R. Malik 12.6. – 18.6. (AT)
HIP NEWS June 2nd 2014
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HIP STAFF NEWS
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The HIP QCD-theory project leader Tuomas Lappi was awarded the 2014 Zimányi Medal for his pioneering independent and collaborative work on Color Glass Condensate and the Glasma models of initial conditions in high energy A+A reactions that provide theoretical foundations on which many current bulk viscous hydrodynamic and jet quenching opacity calculations depend. Tuomas received the medal and 2000 USD prize on 24 May at the nearly-900-participant Quark Matter 2014 -conference in Darmstadt. This medal is the most prestigious young-scientist (below 40) award in this field.
DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 3 June 2014 at 10.15 in A315
Matti Järvinen (Heraklion)
New results from holographic V-QCD
Abstract: I discuss latest developments in holographic bottom-up models for QCD in the Veneziano limit (V-QCD) at finite quark mass. Masses, the S-parameter, and condensates have expected mass dependence for all values of x=Nf/Nc, and the axial anomaly of QCD is correctly implemented by a string-motivated CP-odd sector of the V-QCD action. Consequently, the pion and eta prime masses satisfy the Gell-Mann-Oakes-Renner and Witten-Veneziano relations. I also discuss how double trace deformations can be studied.
Thursday 5 June 2014 at 10.15 in A315
Santosh Kumar Rai (Allahabad)
Some Higgs studies after the “Higgs” discovery
Abstract: After giving a flavour of some basic extensions of the Higgs sector beyond the Standard Model, I will discuss two different Higgs physics scnenarios where the extensions to the Higgs sector are inherently chromophobic by construction and their implications in the context of LHC studies.
Friday 6 June 2014 at 10.15 in A315
Charles Bennett (Baltimore, Principal Investigator, WMAP)
Cosmology and the Cosmic Microwave Background
Abstract: Studies of the Cosmic Microwave Background (CMB) have led to major advances in cosmology. In this talk I will summarize recent CMB results and their implications for cosmology. I will compare and contrast select WMAP and Planck cosmological results. I will also discuss other some cosmological measurements, both past and future, that do not involve the CMB. I will focus on how these measurements help to test cosmological models and narrow the range off their associated parameters. Specific topics will include constraints on the Hubble constant and inflation models.
Staff Training 2014 (2015)
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For new employees
For researchers and doctoral candidates
https://flamma.helsinki.fi/portal/home/sisalto?_nfpb=true&_pageLabel=content_view&contentId=HY320180&placeId=HY056472
Registration on Henkka: www.helsinki.fi/trainingcalendar
Visitors
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C. Bennett 6.6. (H.K-S)
D. Figueroa 30.5. – 2.6. (KE)
M. Hindmarsh 22.4. – 15.6. (KR)
T. Koivisto 21.5. – 4.6. (KE)
A. Rajantie 2.6. (KE)