HIP NEWS June 8th 2015
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COSMO-Seminar
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Monday 8 June 2015 at 10:15 in A315
Alessandro Mirizzi (Bari University, Italy)
What Next on Axion-like Particles: Current Bounds and Discovery Opportunities

Abstract: Very light axion-like particles (ALPs) with a two-photon vertex are predicted in many extensions of the Standard Model of particle physics. Depending on the actual value of their mass, ALPs can play an important role in cosmology, being valuable dark matter candidates. The coupling with photons allows for ALP-photon mixing in external electromagnetic fields. This effect is exploited for direct searches of ALPs in laboratory experiments. The two-photon vertex would also induce the mixing with ALPs for photons emitted by distant astrophysical sources, and propagating in the large-scale cosmic magnetic fields. This mixing could produce signatures in astrophysical observations, ranging from the cosmic microwave background to the high-energy gamma-rays. In this talk I will present an overview of current bounds on ALPs and discovery opportunities in the planned laboratory and astrophysical experiments.

DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 9 June 2015 at 10.15 in A315
Harvey Meyer (Mainz)
Real-time phenomena in finite-temperature QCD

Abstract: I present two topics in finite-temperature QCD: one concerns the pion quasiparticle and its dispersion relation in the low-temperature phase; the second concerns non-static screening masses in the high-temperature phase, the corresponding perturbative predictions and the relation of these masses to transport properties and the dilepton rate.

COSMO-Seminar
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Wednesday 10 June 2015 at 14:15 in A315
Nelson Nunes (University of Lisbon)
TBA

DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Thursday 11 June 2015 at 10.15 in A315
Carlos Hoyos (Oviedo)
Ward identities and transport in 2+1 dimensions

Abstract: The Hall viscosity of chiral superfluids is determined by the angular momentum density. One can understand and generalize this relation using Ward identities of the energy-momentum tensor. Furthermore, the same identities connect viscosities and conductivities. A preliminary analysis in AdS/CFT reveals that the identities seem to be non-trivial in the sense that they cannot be derived simply from the asymptotic expansion of the solutions.

Unis svenska sommarfest
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https://flamma.helsinki.fi/fi/tiedotteet/unis-svenska-sommarfest

Visitors
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G. Bulmer 8.6. – 12.6. (KR,MH)
M. Hindmarsh 19.4. – 14.6. (KR)
C. Hoyos 8.6. – 12.6. (NJ,AV)
A. Mirizzi 8.6. (KE,SN)
N. Nunes 7.6. – 13.6. (KE,SN)

HIP NEWS June 1st 2015
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DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 2 June 2015 at 10.15 in A315
Stefan Pokorski (Warsaw)
Looking for hidden supersymmetry

Abstract: After a brief review of the state of supersymmetry after RUN I of the LHC, it will be argued that the supersymmetric electroweak sector may play the leading role in its discovery. Experimental signatures of electroweakinos and the prospects for their discovery will be discussed.

Unis svenska sommarfest
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https://flamma.helsinki.fi/fi/tiedotteet/unis-svenska-sommarfest

Visitors
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M. Hindmarsh 19.4. – 14.6. (KR)
C. Hoyos 8.6. – 12.6. (NJ,AV)
N. Nunes 7.6. – 13.6. (KE,SN)
S. Pokorski 2.6. – 5.6. (OL,KK)

HIP NEWS May 25th 2015
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Professorsinstallation / Inauguration of new professors /
Inaugural lectures
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Professor, Doctor of Philosophy Mark Hindmarsh was appointed Visiting Professor of Theoretical Physics from 1 June 2014 to 31 May 2019.

Wednesday 27 May 2015 at 14.15 hrs
Professor of Theoretical Physics Mark Hindmarsh: The first few picoseconds

Place: The University Main Building, Aleksanterinkatu 5. Lecture Room 6 (new side, 3rd floor).

CERN School of Computing 2015 in Greece
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Few places available for the upcoming school in Kavala, Greece ( http://indico.cern.ch/e/csc2015 ) that has a registration deadline on May 30th.
Time: 14-26 September 2015
Place: The 38th CERN School of Computing will be held in Kavala, Greece.
The school will be organized by CERN in collaboration with the Eastern Macedonia and Thrace Institute of Technology.

Visitors
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M. Hindmarsh 19.4. – 14.6. (KR)
N. Hopkins 4.5. – 29.5. (KR)
C. Hoyos 8.6. – 12.6. (NJ,AV)
N. Nunes 7.6. – 13.6. (KE,SN)

HIP NEWS May 18th 2015
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DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 19 May 2015 at 10.15 in A315
Yago Bea (Santiago de Compostela)
Massive study of magnetized unquenched ABJM

Abstract: We study the physics of a magnetized probe D6-brane in the ABJM theory with unquenched massive flavor. We analyze the effect of the mass of the background branes in the magnetic catalysis of chiral symmetry breaking, and also the effect of the magnetic field on the meson spectrum. Besides, we obtain a non-commutative version of the background via a TsT rotation, which has an NSNS B2 field turned on, as an intermediate step towards a fully backreacted solution. In addition, we include new analytical solutions, perturbative in flavor, for the background functions.

COSMO-Seminar
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Wednesday 20 May at 14:15 in A315
Mikolaj Korzynski (Center for Theoretical Physics, Warsaw)
Nonlinear effects and coarse-graining in general relativity

Abstract: I will discuss the nonlinear effects of general relativity which appear if we perform the coarse-graining of the fine structure of a solution. In particular I will discuss the effects of nested inhomogeneities extending over many scales.

Visitors
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Y. Bea 11.5. – 22.5. (NJ)
M. Hindmarsh 19.4. – 14.6. (KR)
N. Hopkins 4.5. – 29.5. (KR)
M. Ihl 18.5. – 22.5. (NJ)
M. Korzynski 18.5. – 21.5. (KE,SN)

HIP NEWS May 11th 2015
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DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 12 May 2015 at 10.15 in A315
Hans-Peter Nilles (Bonn)
Unification of Fundamental Interactions

Abstract: Symmetries have played a crucial role in the development of the standard model of particle physics. Moreover, they are believed to provide the key ingredients for a unified description of all fundamental interactions. We review the arguments that favour the investigation of these mathematical structures and explain possible consequences for particle physics and cosmology.

Watch online! Campus well-being event: Workplace free of harassment
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Faculty of Science held a Campus well-being event under the theme Workplace free of harassment. You can view the event online at: http://video.helsinki.fi/Arkisto/flash.php?id=20442.

Visitors
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Y. Bea 11.5. – 22.5. (NJ)
M. Hindmarsh 19.4. – 14.6. (KR)
N. Hopkins 4.5. – 29.5. (KR)
M. Korzyński 18.5. – 21.5. (KE,SN)
H.P. Nilles 12.5. – 15.5. (OL)

HIP NEWS May 4th 2015
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COSMO-Seminar
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Wednesday 6 May at 14:15 in A315
Chiara Caprini (CEA, Saclay)
Cosmology with gravitational wave detection

Abstract: Gravitational waves can constitute a unique probe of the primordial universe. In many cases, the characteristic frequency of the emitted GW is directly related to the energy scale at which the GW source is operating: consequently, different GW detectors can probe different energy scales in the evolution of the universe. After a general introduction to the subject, this seminar reviews some of the principal cosmological sources of a stochastic background of GW and discuss detection prospects.

The 2015 CERN-JINR European School of High-Energy Physics
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The 2015 European School of High-Energy Physics will take place in
Bansko, Bulgaria, 2 – 15 September 2015

The deadline for applications is 8 May 2015.
Further details are available here:
http://physicschool.web.cern.ch/PhysicSchool/ESHEP/ESHEP2015/

Watch online! Campus well-being event: Workplace free of harassment
——————————————————————————————————-
Faculty of Science held a Campus well-being event under the theme Workplace free of harassment. You can view the event online at: http://video.helsinki.fi/Arkisto/flash.php?id=20442.

Visitors
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C. Caprini 5.5. – 7.5. (MH,SN,KE)
M. Hindmarsh 19.4. – 14.6. (KR)
N. Hopkins 4.5. – 29.5. (KR)

HIP NEWS April 27th 2015
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Staff training: Welcome breakfast
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The course is targeted for all the new international employees of the University of Helsinki.
Register until 30.04.2015.
Sign up in http://www.helsinki.fi/trainingcalendar ( Staff Training Calendar HENKKA)
If you don’t have access to Henkka, please do the registration via this link by copying the address to your browser:
https://elomake.helsinki.fi/lomakkeet/56395/lomake.html

DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 28 April 2015 at 10.15 in A315
Dorota Sokolowska (Warsaw)
Dark matter in multi-scalar extensions of the Standard Model with discrete symmetries

Abstract: Multi-scalar extensions of the Standard Model can accommodate a viable Dark Matter candidate and modification of Higgs decay rates, particularly into two photons. One of the simplest choices for the extended scalar sector is the Inert Doublet Model, i.e. the Standard Model with an additional inert scalar doublet. The IDM can be further extended by extra doublets or singlets, which may modify both DM- and collider phenomenology.
In this talk I will discuss the the interplay between the LHC results for the decay of the SM-like Higgs into two photons and the properties of Dark Matter from Planck measurements. Constraints for multi-scalar models obtained in this way are stronger or comparable to the constraints provided by direct and indirect detection experiments for low, medium and high Dark Matter mass regions.

The 2015 CERN-JINR European School of High-Energy Physics
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The 2015 European School of High-Energy Physics will take place in
Bansko, Bulgaria, 2 – 15 September 2015

The deadline for applications is 8 May 2015.
Further details are available here:
http://physicschool.web.cern.ch/PhysicSchool/ESHEP/ESHEP2015/

Visitors
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M. Hindmarsh 19.4. – 14.6. (KR)
D. Sokolowska 27.4. – 30.4. (VK)

HIP NEWS April 20th 2015
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COSMO-Seminar
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Wednesday 22 April at 14:15 in A315
Jorma Louko (University of Nottingham)
Did the chicken survive the firewall?

The forty-year debate about the final state of an evaporating black hole was recently reinvigorated by the suggestion that if unitarity is preserved, the black hole horizon develops a “firewall” which a) affects strongly any matter that crosses it and b) erases any information that such matter may carry about the outside world. We present evidence that neither a) nor b) is true for a firewall within flat spacetime quantum field theory, arguing that the same holds for sufficiently young gravitational firewalls. A firewall’s prospective capability to resolve the information loss paradox must hinge on its detailed gravitational structure, presently poorly understood.

The 2015 CERN-JINR European School of High-Energy Physics
————————————————————————————–
The 2015 European School of High-Energy Physics will take place in
Bansko, Bulgaria, 2 – 15 September 2015

The deadline for applications is 8 May 2015.
Further details are available here:
http://physicschool.web.cern.ch/PhysicSchool/ESHEP/ESHEP2015/

Staff training: Completing your tax return form (April 28th)
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Sign up in http://www.helsinki.fi/trainingcalendar (Staff Training Calendar HENKKA)
Registration is required latest Wednesday April 22nd 2015.

HENKKA: Tietoturvakoulutus
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Ilmoittautuminen http://www.helsinki.fi/trainingcalendar (HENKKA Koulutuskalenteri) 23.04.2015 mennessä.

Visitors
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M. Hindmarsh 19.4. – 14.6. (KR)
J. Louko 20.4. – 24.4. (KK)
D. Weir 20.4. – 24.4. (KR)

HIP NEWS April 13th 2015
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COSMO-Seminar
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Wednesday 15 April at 14:15 in A315
Sofie Marie Koksbang (University of Aarhus)
On the precision of ray tracing approximations — direct comparisons based on Szekeres models

In standard cosmology, model predictions of observables are based on Newtonian and perturbative approximations. But how precise are the standard approximation schemes? This question is typically sought answered through perturbation theory, but an alternative is to make direct comparisons of the approximation schemes with exact computations. I will introduce the family of exact, inhomogenous solutions to the Einstein field equations known as the quasi-spherical Szekeres models. After discussing some of the main results obtained with these models, I will introduce standard ray tracing techniques and discuss how the precision of these can be studied by using mock N-body data based on Szekeres models.

DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Thursday 16 April 2015 at 10.15 in A315
Giacomo Cacciapaglia (Lyon, IPN)
Unveiling the dynamics behind a composite Higgs

Abstract: I will present a novel approach to composite Higgs model building, based on a simple fundamental dynamics. It allows to describe in a unified way the Higgs as a pNGB and as a Technicolor-like bound state. The status after the LHC Run I will be discussed, together with the interplay with Lattice calculations and possible avenues for model building.

COSMO-Seminar
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Thursday 16 April at 10:15 in E205
Oleg Novikov (Saint Petersburg State University)
Influence of gravity and defect on a thick brane formation

The model of scalar matter minimally coupled to gravity that permits the formation of a domain wall (thick brane) triggered by a defect in the form of a thin brane is studied. The potential of the scalar matter is assumed to have O(N) symmetry softly broken by terms quadratic in fields. The background solutions are obtained and the corrections due to the gravity and defect are calculated. The mixing of gravitational and scalar degrees of freedom leads to the contributions to the fluctuation potential that remain nontrivial in the weak gravity limit. Their influence on the spectrum of light localized scalar states is investigated for various values of the defect tension. The talk will be mostly based on arXiv:1306.0723

The 2015 CERN-JINR European School of High-Energy Physics
————————————————————————————–
The 2015 European School of High-Energy Physics will take place in
Bansko, Bulgaria, 2 – 15 September 2015

The deadline for applications is 8 May 2015.
Further details are available here:
http://physicschool.web.cern.ch/PhysicSchool/ESHEP/ESHEP2015/

Staff training: Completing your tax return form (April 28th)
———————————————————————————–
Sign up in http://www.helsinki.fi/trainingcalendar (Staff Training Calendar HENKKA)
Registration is required latest Wednesday April 22nd 2015.

HENKKA: Tietoturvakoulutus
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Ilmoittautuminen http://www.helsinki.fi/trainingcalendar (HENKKA Koulutuskalenteri) 23.04.2015 mennessä.

Visitors
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G. Cacciapaglia 15.4. – 18.4. (KT,AV)
M. Hindmarsh 19.4. – 14.6. (KR)
S.M. Koksbang 14.4. – 15.4. (KE,SN)
J. Louko 17.4. – 26.4. (KK)
S. Stricker 9.4. – 13.4. (AV)

HIP NEWS March 30th 2015
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HIP Staff News
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Professor Peter Dendooven (Groningen) has been appointed Professor (FiDiPro) at HIP for the period 1.3.2015 – 28.2.2019. He will be working on the Tekes funded project NINS3.

DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS
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Tuesday 7 April 2015 at 10.15 in A315
A. Rebhan (Wien)
Top-down holographic glueballs and their decay patterns

Abstract: I report recent results on the spectrum and the decay patterns of scalar and tensor glueballs in the top-down holographic Witten-Sakai Sugimoto model. This model, which has only one free dimensionless parameter, gives semi-quantitative predictions for the vector meson spectrum, their decay widths, and also a gluon condensate in agreement with SVZ sum rules. The predictions for glueball decay are compared with experimental data for some of the widely discussed gluon candidates in the meson spectrum.

The 2015 CERN-JINR European School of High-Energy Physics
————————————————————————————–
The 2015 European School of High-Energy Physics will take place in
Bansko, Bulgaria, 2 – 15 September 2015

The deadline for applications is 8 May 2015.
Further details are available here:
http://physicschool.web.cern.ch/PhysicSchool/ESHEP/ESHEP2015/

Finnish working culture
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The course is targeted for all new international employees of the Helsinki University
Sign up in http://www.helsinki.fi/trainingcalendar ( Staff Training Calendar HENKKA)

Visitors
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V. Keränen 30.3. – 10.4. (EK-V)
A. Rebhan 6.4. – 9.4. (AV)
S. Stricker 9.4. – 13.4. (AV)