HIP NEWS September 15th 2014

Posted on September 15, 2014December 1, 2023 by Tarja Heikkilä

HIP NEWS September 15th 2014
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Upcoming events in Finland: CERN´s 60th anniversary
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See the link http://www.hip.fifi/?page_id=1963

Visitors
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A. Golovnev 17.9. – 10.10.

HIP NEWS September 8th 2014

Posted on September 8, 2014December 1, 2023 by Tarja Heikkilä

HIP NEWS September 8th 2014
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Upcoming events in Finland: CERN´s 60th anniversary
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See the link http://www.hip.fifi/?page_id=1963

DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 9 September 2014 at 10.15 in A315
Bhupal Dev (Univ. of Manchester)
Naturally Aligned Two Higgs Doublet Model and its Collider Signatures

Abstract: We show that the lightest Higgs sector resulting from a Maximally Symmetric Two Higgs Doublet Model (MS-2HDM) based on the SO(5)-symmetry becomes naturally aligned with that of the Standard Model (SM), independently of the charged Higgs boson mass and \tan\beta. Nevertheless, renormalization group effects due to the hypercharge gauge coupling and third-generation Yukawa couplings may break sizably this SM alignment, along with the custodial symmetry inherited by the SO(5) group. Using the current Higgs signal strength data from the LHC, which disfavor large deviations from the SM alignment limit, we derive lower mass bounds on the heavy Higgs sector as a function of \tan\beta, which can be stronger than the existing limits for a wide range of parameters. Finally, we propose new collider signals involving third-generation quarks to directly probe the heavy Higgs sector of the MS-2HDM during the run-II phase of the LHC.

COSMO-Seminar
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Wednesday 10 Sep 2014 at 14:15 in A315
Chris Haines (DAS, University of Chile)
Understanding the SF-density relation in a Lambda-CDM universe where massive clusters are still being assembled

The evolution and star-formation activity of galaxies depends
strongly on their environment, the strongest impacts being seen in massive clusters. To understand the processes transforming cluster galaxies, we use cosmological simulations which follow the growth and assembly of massive clusters, and the orbits of galaxies as they are accreted into clusters and transformed. We compare these simulations to results from the Local Cluster Substructure Survey (LoCuSS) of 30 massive clusters at z~0.2, combining Spitzer 24um imaging and extensive spectroscopy of cluster members, to provide strong constraints for the efficiency and time-scales required to quench star-formation in recently accreted cluster galaxies. We see that clusters are still being assembled, by finding numerous infalling X-ray groups, providing sites for galaxies to be pre-processed prior to their arrival into the clusters themselves, as required to explain the shortfall of star-forming galaxies at large cluster-centric radii.

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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F. Hehl 18.8. – 12.9. (AT)

HIP NEWS September 1st 2014

Posted on September 1, 2014December 1, 2023 by Tarja Heikkilä

HIP NEWS September 1st 2014
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DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 2 September 2014 at 10.15 in A315
Gero von Gersdorff (Sao Paulo)
New Physics Effects in Anomalous Gauge Boson Vertices

Abstract: TBA

September call 2014 / Academy’s Ask & Apply info
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Please check for more detailed programme and registration:
https://flamma.helsinki.fi/fi/suomenakatemia

Finnish Academy of Science and Letters
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Väisälä Foundation fellowships open for application during 15.8.-26.9.2014, see www.acadsci.fi.

Tekes: Calls for proposals in 2014
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Tekes, the Finnish technology funding agency, has several calls for research funding and workshops for information and networking in fall 2014. Some of the headlines are in Finnish only.
Please ask more information from Maarit Haataja. You can also find additional information on Flamma pages.
https://flamma.helsinki.fi/portal/units/farmasia?_nfpb=true&_pageLabel=P12000359611379669328883&contentId=HY323628&placeId=HY300372

Visitors
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F. Hehl 18.8. – 12.9. (AT)
G. von Gersdorff 30.8. – 4.9. (AV)

HIP NEWS August 25th 2014

Posted on August 25, 2014December 1, 2023 by Tarja Heikkilä

HIP NEWS August 25th 2014
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DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 26 August 2014 at 10.15 in A315
Mikko Laine (Bern)
Towards first principles in particle cosmology

Abstract: Some of the important issues in particle cosmology (such as the existence of a matter-antimatter asymmetry) can be faithfully addressed in terms of interactions probed at terrestrial experiments, only if we know how to compute reliably with relativistic thermal quantum field theories. After outlining a few of the conceptual and technical challenges involved, I illustrate the status of the field with the example of the right-handed neutrino production rate in a very early universe. The role that this quantity plays in practical matter-antimatter asymmetry computations is briefly sketched.

Finnish Academy of Science and Letters
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Väisälä Foundation fellowships open for application during 15.8.-26.9.2014, see www.acadsci.fi.

Tekes: Calls for proposals in 2014
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https://flamma.helsinki.fi/portal/units/farmasia?_nfpb=true&_pageLabel=P12000359611379669328883&contentId=HY323628&placeId=HY300372

Visitors
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F. Hehl 18.8. – 12.9. (AT)
G. von Gersdorff 30.8. – 4.9. (AV)

HIP NEWS August 18th 2014

Posted on August 18, 2014December 1, 2023 by Tarja Heikkilä

HIP NEWS August 18th 2014
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Finnish Academy of Science and Letters
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Väisälä Foundation fellowships open for application during 15.8.-26.9.2014, see www.acadsci.fi.

DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 19 August 2014 at 10.15 in A315
Tommi Markkanen (Helsinki)
Spacetime curvature and the Higgs stability during inflation

Abstract: It is currently widely accepted that for a high scale of inflation the EW Higgs vacuum is unstable due to large fluctuations of order H. However, this conclusion is reached by neglecting potentially significant effects induced by the spacetime curvature. In this talk I review the derivation of a one-loop SM Higgs effective potential in curved space and discuss its implications. In particular I will show that generally a large curvature mass is generated which can stabilize the potential against fluctuations induced by inflation.

Finnish for foreigners: registration for autumn 2014 courses has begun
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Register in advance by 11 August.
https://flamma.helsinki.fi/portal/home/sisalto?_nfpb=true&_windowLabel=contentviewer&contentId=HY321951&lang=en&_pageLabel=content_view

Visitors
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F. Hehl 18.8. – 12.9. (AT)
G. von Gersdorff 30.8. – 4.9. (AV)
T. Koivisto 18.8. – 22.8. (KR, KE)
Y. Tada 19.8. – 22.8. (KE)

HIP NEWS August 11th 2014

Posted on August 18, 2014December 1, 2023 by Tarja Heikkilä

HIP NEWS August 11th 2014
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DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Thursday 14 August 2014 at 10.15 in A315
Timo Alho (Jyväskylä)
Thermodynamics of holographic models for QCD in the Veneziano limit

Abstract: We have studied the thermodynamics of a class of holographic bottom-up models for QCD in the limit where both Nc and Nf go to infinity such that their ratio is finite. These Veneziano QCD -models incorporate a gravity-dilaton system to model the glue dynamics and a scalar tachyon for the fermion degrees of freedom. We have solved the system with full backreaction at finite temperature and finite chemical potential, allowing a determination of the chiral and deconfining transitions. I will also discuss ongoing work in modeling the low-temperature hadron gas phase.

Thursday 14 August 2014 at 14.15 in A315
Matthias Ihl (Porto)
Holographic Bilayer/Monolayer Phase Transitions

Abstract: In the present talk, I will discuss the phase structure of bilayer and monolayer phases in the (2+1)-dimensional defect field theory whose gravity dual is obtained by embedding D5/anti-D5 probe flavour branes in the singular conifold. We study in detail the embedding equations and compare the free energies of the resulting
configurations at non-zero temperature and external magnetic field perpendicular to the defects. Moreover, we analyse the meson spectrum and confirm the stability of the single bilayer solution.

Visitors
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D. Bödeker 13.8. – 16.8. (KR)
G. von Gersdorff 30.8. – 4.9. (AV)
Y. Tada 19.8. – 24.8. (KE)
A. Tranberg 14.8. – 16.8. (KR)

HIP NEWS August 4th 2014

Posted on August 4, 2014December 1, 2023 by Tarja Heikkilä

HIP NEWS August 4th 2014
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Visitors
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D. Bödeker 13.8. – 16.8. (KR)
G. von Gersdorff 30.8. – 4.9. (AV)
Y. Tada 19.8. – 24.8. (KE)

HIP NEWS June 23rd 2014

Posted on June 23, 2014December 1, 2023 by Tarja Heikkilä

HIP NEWS June 23rd 2014
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Visitors
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J.S. Kim 24.6. – 28.6. (OL)

HIP NEWS June 16th 2014

Posted on June 16, 2014December 1, 2023 by Tarja Heikkilä

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

Posted on June 9, 2014December 1, 2023 by Tarja Heikkilä

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)