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
———————————————-
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)