HIP NEWS April 13th 2015
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
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.
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:
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.
Ilmoittautuminen http://www.helsinki.fi/trainingcalendar (HENKKA Koulutuskalenteri) 23.04.2015 mennessä.
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)