Conveners
Plenary short presentations
- Babette Doebrich (DESY)
Mr
Ankit Beniwal
(Oskar Klein Centre, Stockholm University)
20/06/2018, 11:25
Presentation
We perform a global study of the extended scalar singlet model with a fermionic dark matter (DM) candidate. Using the most up-to-date results from the Planck measured DM relic density, direct detection limits from the PandaX-II experiment, electroweak baryogenesis (EWBG), electroweak precision observables (EWPO) and Higgs searches at colliders, we constrain the 7-dimensional model parameter...
Mr
Marco Gorghetto
(SISSA)
20/06/2018, 11:30
Presentation
The axion solution to the strong CP problem also provides a natural
dark matter candidate. If the PQ symmetry has ever been restored after
inflation, topological defects of the axion field would have formed and
produced relic axions, whose abundance is in principle calculable. Using
numerical simulations I will present a detailed study of the evolution of
axion strings and the resulting...
Dr
Jingeun Kim
(Center for Axion and Precision Physics Resarch, Institute for Basic Science)
20/06/2018, 11:35
Presentation
The presence of dark matter had profound consequences on the evolution of the Universe. The Standard Model does not accommodate a suitable dark matter candidate. Therefore, the existence of dark matter is a crucial phenomenological evidence for physics Beyond the Standard Model. The pressing goal of current and future dark matter experiments is to answer the question of whether dark matter...
Malte Buschmann
(University of Michigan)
20/06/2018, 11:40
Presentation
We perform a full (3+1)-dimensional numerical simulation of the axion field around the QCD epoch. Our aim is to fully resolve large dynamical non-linear effects in the inhomogenous axion field. These effects are important as they lead to large overdensities in the field at late times. Those overdensities will eventually evolve into axion minicluster, which have various phenomenological...
Mr
Youngeun Kim
(IBS/CAPP, KAIST)
20/06/2018, 11:45
Presentation
An effective approximation is applied to Maxwell’s equations with an anomalous axion interaction. A new set of Maxwell’s equations acquired from this approximation describes only reacted fields generated by the anomalous interaction. Unlike other approaches, this set of Maxwell’s equations inherently satisfies the boundary condition for haloscope searches. The electromagnetic field solutions...
Mr
Alexander Millar
(Max Planck Institute for Physics)
20/06/2018, 11:50
Presentation
We study the effect of the axion dark matter velocity in the recently proposed dielectric haloscopes, a promising avenue to search for well-motivated high mass (40−400 μeV) axions. We describe non-zero velocity effects for axion-photon mixing in a magnetic field and for the phenomenon of photon emission from interfaces between different dielectric media. As velocity effects are only important...
Dr
Ken'ichi Saikawa
(Max Planck Institute for Physics)
20/06/2018, 11:55
Presentation
In this talk, we discuss the role of Standard Model thermodynamics in cosmology and identify how it affects the spectrum of primordial gravitational waves. By collecting recent results of perturbative and non-perturbative analysis of thermodynamic quantities in the Standard Model, we obtain the effective degrees of freedom including the corrections due to non-trivial interaction properties of...
Dr
Arne Wickenbrock
(JGU)
20/06/2018, 12:00
Presentation
The global network of optical magnetometers for exotic physics search (GNOME) is currently being set-up internationally. More than 10 highly-sensitive, shielded magnetometers are synchronized via GPS and look for global transient spin-interacting events as a signature for new physics. As a model we consider interactions with axion-like particle domain walls that transverse the Earth.
We...
Dieter Trines
(DESY)
20/06/2018, 12:05
Presentation
The procedures used to increase the aperture of HERA dipoles for the ALPS II experiment in preparation at DESY are described. The results achieved up to now for 10 out of the required 20 dipoles for ALPS II are presented as well as the maximum obtained currents of the magnets.
Andreas Pargner
(Karlsruhe Institute of Technology)
20/06/2018, 12:10
Presentation
We present a semi-analytical method to calculate the average axion energy density, as well as the power spectrum, from the re-alignment mechanism in a scenario where the Peccei-Quinn symmetry breaking happens after inflation. Furthermore, we develop a modified Press & Schechter approach, suitable to describe the collapse of non-linear density fluctuations during radiation domination. This...
Cristian Boffo
(Babcock Noell GmbH)
20/06/2018, 12:15
Presentation
Madmax (Magnetized Disc and Mirror Axion Experiment) is newly started project aiming to verify the existence of dark matter axions. The experiment takes advantage of the axions ability to generate a weak electric field when immersed in a static magnetic field. In order to operate with the required sensitivity a figure of merit of 100 T2m2 in the experimental volume is necessary. This goal is...
Dr
Pedro Alvarez
(Universidad de Antofagasta)
20/06/2018, 12:20
Presentation
I will introduce a model for the dark sector that contains axion-like particles and hidden photons. In this model, both particles can couple to photons. We provide bounds for the couplings versus the mass, using current results from ALPS-I and PVLAS.
Justin Baier
(University of Freiburg)
20/06/2018, 12:25
Presentation
The KWISP (Kinetic Weakly Interacting Slim Particle) detector is part of the CAST experiment at CERN exploring the dark sector. It utilizes an ultra-sensitive opto-mechanical force sensor for the search for solar chameleons. A chameleon is a hypothetical scalar particle postulated as dark energy candidate, which has a local density-dependent direct coupling to matter. Considering this...
