HIP NEWS November 30th 2015

HIP NEWS November 30th 2015

Tuesday 1 December 2015 at 10.15 in A315
Heribert Weigert (Cape Town)
QCD at small high energies: Wilson line correlators in the Color Glass Condensate and beyond

Abstract: Modern collider experiments use ever higher energies for many reasons, be it to study the QCD phase transition, to study the newest confirmed addition to the Standard Model or to search for physics beyond the standard model. In all of his QCD plays a central role, be it the immediate area of study (as with the quark gluon plasma) or as the main limiting factor on precision (as with standard model particle physics). Over the last decade it has been established that at small x the machinery and phenomenology of the Color Glass Condensate provide powerful tools to study the energy dependence of cross sections for a wide range of observables. Its evolution equation, the JIMWLK equation has a structural analogue in jet evolution equations (the BMS equation and its finite Nc generalizations) with a conformal map establishing the connection. The key ingredient that drives cross sections in all these cases are Wilson line correlators which also appear in GPDs and in energy loss calculations aiming at studying the QCD as a medium. This is clearly too big a canvas to fill with paint completely with one talk, instead, I will content myself with the first steps needed to expose these connections, starting from JIMWLK and the CGC, and show some ideas of how to study and analyze the underlying structures.

Thursday 3 December 2015 at 14:15 in A315 (Note the date!)
Kwan Chuen Chan (ICE Barcelona)
Halo clustering in Lagrangian space

Abstract: Although we observe halos (or galaxies) in Eulerian space, modeling of halo clustering often starts with halos in the Lagrangian space. We construct Lagrangian halos by tracing the particles in Eulerian halos back to Lagrangian space in N-body simulations to study their properties. The window function for Lagrangian halos always appears in the theoretical modelling of the Lagrangian halos. Although the window is often assumed to be a top-hat, we find that it is more smooth than a top-hat, but less diffuse than a Gaussian. Using this effective window function together with the scale-dependent excursion set bias parameters we are able to fit the Lagrangian cross bias parameter in Fourier space well up to k R_{Lag} ~ 10, where R_{Lag} is the Lagrangian size of the halo. Furthermore we check the so-called Lagrangian bias consistency relations. These powerful relations not only enable us to check the self-consistency of the biasing prescription, it can also allow us to extract the halo formation physics.

Fulbright-Technology Industries of Finland Grant
More information about Fulbright-Technology Industries of Finland Grants (in Finnish): www.fulbright.fi/fi/stipendit-tohtorintutkinnon-jalkeiseen-tutkimukseen-ja-luennointiin/fulbright-technology-industries.
Application deadline is December 14, 2015, 10:00 a.m.

Update your information in Tuhat
Permanently employed teaching and research staff are requested to update their information in the Tuhat database by 11 January 2016. https://flamma.helsinki.fi/en/notifications/update-your-information-in-tuhat

The Strategic Research Council (SRC) at the Academy of Finland : Apply for strategic research funding
The SRC’s call will be implemented in two stages. The first stage, for letters of intent, will be open in the Academy of Finland’s online services between 5 November and 9 December 2015.
In addition, the SRC will open a supplementary call within the 2015 programme A Climate-Neutral and Resource-Scarce Finland. https://flamma.helsinki.fi/en/notifications/apply-for-strategic-research-funding

K.C. Chan 29.11. – 6.12. (FM)
H. Weigert 23.11 – 5.12. (KR)
J. Zeilinger 20.11 – 5.12. (KR)

Posted in Weekly Newsflash.