Conveners
Plenary short presentations
- Axel Lindner (DESY)
Prof.
Inma Dominguez
(Universidad de Granada)
18/06/2018, 16:20
Presentation
We study the effect of axions in the evolution of stars that are close to the minimum stellar mass that experiences central carbon burning, called Mup. This mass limit is a fundamental property in astrophysics as it defines which stars end their evolution as carbon-oxygen white dwarfs (CO WDs) and which ones as oxygen-neon white dwarfs, electron-capture supernovae and normal core collapse...
Dr
Luca Visinelli
(Stockholm University)
18/06/2018, 16:25
Presentation
We show that fluctuations of the Standard Model Higgs boson field yield large particle masses dur- ing inflation and reheating, and in turns to a temporary blockage of the reheating process and a lower reheat temperature after inflation. We study the effects on the multiple stages of reheating: resonant particle production (preheating) as well as perturbative decays from coherent oscillations...
Sebastian Baum
(OKC & Stockholm University)
18/06/2018, 16:30
Presentation
Axion stars are hypothetical objects formed of axions, obtained as localized and coherently oscillation solution to the classical equation of motion. I will discuss the family of axion star solutions for QCD axions. Depending on the value of the field amplitude at the core $\theta_0$, the equilibrium of the system arises from the balance of kinetic pressure and either self-gravity or axion...
Dr
Erik Lentz
(University of Goettingen)
18/06/2018, 16:35
Presentation
The search for QCD axion dark matter is well underway. Many of these searches require detailed knowledge of the axion's cosmological distribution. However, our understanding of axion structure formation is far from complete, due largely to the candidate's highly-degenerate state. This talk presents a new model of axion structure formation that includes the quantum nature of condensed Bose...
Mr
Dennis Schmelzer
(AEI Hannover)
18/06/2018, 16:40
Presentation
**ALPS II**
The Any Light Particle Search (ALPS) II is a Light-Shining-Through-a-Wall type experiment which will consist of two optical resonators to enhance the rates of 1064 nm photons oscillating into Axion-like-particles (ALPs) and vice-versa. [1]
**Dichroic locking scheme**
Both cavities have to be resonant for the same spatial mode and their lengths need to be controlled so that...
Ms
Emi Masaki
(Kobe University)
18/06/2018, 16:45
Presentation
Cosmological magnetic field can induce conversion between photon and axion.
The origin of cosmological magnetic field is still outstanding problem,
and its actual configuration is not well known.
However, most previous studies on conversion have been carried out in one simple magnetic configuration.
In this talk, I will discuss photon-axion conversion process in another magnetic...
Mr
Jan Veltmaat
(Göttingen)
18/06/2018, 16:50
Presentation
Dark matter consisting of ultralight axions gives rise to a unique density structure on galactic scales. Insight to these processes can be gained by numerical simulations. I will give an overview of simulation results and their implications for observational probes.
Mr
Arata Aoki
(Kobe University)
18/06/2018, 16:55
Presentation
An ultralight scalar field is a viable candidate for dark matter (fuzzy dark matter), which could resolve the so-called small-scale problems accompanying the standard cold dark matter model.
The fuzzy dark matter has quantum pressure arising from the gradient energy of the field, and behaves differently from the cold dark matter on small scales.
The quantum pressure affects various...
Dr
Damian Ejlli
(Novosibirsk State University)
18/06/2018, 17:00
Presentation
In this talk I discuss the possibility of vacuum polarization due to millicharged fermions in a gravitational field and the possibility of superluminal photon propagation in an expanding universe. Vacuum polarization in a graviational field is known to generate photon superluminal propagation in many situations such as in the metric of a black hole, in an expanding universe etc. Based on the...
Mr
Evgeniy Unzhakov
(Petersburg Nuclear Physics Institute)
18/06/2018, 17:05
Presentation
A search for resonant excitation of the first nuclear level of $^{83}\rm{Kr}$ (9.4 keV) by axions formed in the Sun due to the Primakov effect have been carried out. To register the $\gamma$ and X-ray quanta, conversion and Auger electrons arising from the discharge of the nuclear level, we used a gas proportional counter located in a low-background setup in the Baksan underground laboratory...
Dr
Loredana Gastaldo
(Kirchhoff-Institut für Physik, Universität Heidelberg)
18/06/2018, 17:10
Presentation
The International Axion Observatory (IAXO) will be a fourth generation axion helioscope, for the search of axions generated at the core of the Sun. The detection principle used for the IAXO experiment is based on the Primakoff effect. Solar axions reaching the Earth could be converted into photons while passing through a volume under high and static magnetic field. The expected photon spectrum...
Dr
Chitta Ranjan Das
(Bogoliubov Laboratory of Theoretical Physics (BLTP), Joint Institute for Nuclear Research (JINR), Dubna, Russian Federation)
18/06/2018, 17:15
Presentation
Five fundamental problems - neutrino oscillations, baryogenesis, dark matter, inflation, strong CP problem - are solved at one stroke in a model, dubbed as "SM-A-S-H" (Standard Model-Axion-Seesaw-Higgs portal inflation) by Andreas Ringwald et. al. The Standard Model (SM) particle content is extended by three right-handed SM-singlet neutrinos $N_i$, a vector-like color triplet quark $Q$, a...
Dr
Giorgio Galanti
(INAF, Osservatorio Astronomico di Brera)
18/06/2018, 17:20
Presentation
Axion-like particles (ALPs) are very light, neutral, pseudo-scalar bosons which are supposed to interact with two photons. They can give rise to very interesting astrophysical effects taking place in the very-high energy band and above ($10 \, {\rm GeV}-1000 \, {\rm TeV}$) when an external magnetic field is present. So far, the extragalactic magnetic field $B_{\rm ext}$ has been generally...
