HIP NEWS November 23rd 2015
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DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 24 November 2015 at 10.15 in A315
Jacopo Ghiglieri (Bern)
Gravitational wave background from Standard Model physics
Abstract: Any plasma in thermal equilibrium emits gravitational waves, caused by physical processes such as macroscopic hydrodynamic fluctuations and microscopic particle collisions. We will show that, for the largest wavelengths, the emission rate is due to the former process and is proportional to the shear viscosity of the plasma. In the Standard Model at T > 160 GeV, the shear viscosity is dominated by the most weakly interacting particles, right-handed leptons, and is relatively large. We estimate the order of magnitude of the corresponding spectrum of gravitational waves. At smaller wavelengths the leading contribution is given by particle collisions, which we also estimate at leading logarithmic order. Even though at small frequencies (corresponding to the sub-Hz range relevant for planned observatories such as eLISA) this SM background is tiny compared with that from non-equilibrium sources, we conclude that the total energy carried by the high-frequency part of the spectrum is non-negligible if the production continues for a long time. Finally, we suggest that this may constrain (weakly) the highest temperature of the radiation epoch. Observing the high-frequency part directly sets a very ambitious goal for future generations of GHz-range detectors.
COSMO-Seminar
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Wednesday 25 November 2015 at 14:15 in D101
Hannu Kurki-Suonio and Syksy Räsänen (Helsinki)
Yleinen suhteellisuusteoria sata vuotta (In Finnish!)
COSMO-Seminar
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Thursday 26 November 2015 at 14:15 in D114 (Note the date and place!)
Bruce Bassett (Cape Town University)
Rise of the Machines – will artificial intelligence ever do research?
Abstract: The LSST and the SKA will require us to process up to an exabyte of data per day. This presents unprecedented challenges and opportunities for a new generation of statistical inference and machine learning algorithms. In this talk we will discuss some of the issues, approaches and fundamental questions including the question of whether machines will ever do original research.
DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Thursday 26 November 2015 at 14.15 in E207 (note place!)
Albert de Roeck (CERN)
The Large Hadron Collider: The Present and the Future.
Fulbright-Technology Industries of Finland Grant
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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
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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
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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
Visitors
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B. Bassett 26.11. – 27.11. (ML)
M. Ball 24.11. – 27.11. (EB)
K.C. Chan 29.11. – 6.12. (FM)
P. Gasik 24.11. – 27.11. (EB)
J. Ghiglieri 23.11. – 27.11. (AV)
G. Itsios 16.11. – 23.11. (NJ)
V. Ratza 24.11. – 27.11. (EB)
H. Weigert 23.11 – 5.12. (KR)
J. Zeilinger 20.11 – 5.12. (KR)