Abstract

United Nations initiated very successfull events like IHY2007 which were immediately followed by the International Space Weather Initiative (ISWI). All of them lead us to support developing countries to participate in 'Western’ science. In 2006, we started to distribute low cost radio spectrometers CALLISTO all over the world for the following reasons:

1. Developing countries shall become able to do solar science by observing meter-wave radiation of the sun and trying to understand CMEs and coronal heating.
2. It gave us the opportunity to get observational data of 24h coverage of the sun. Very often radio spectra collected in developing countries are of much better quality than in Europe because their infrastructure is also less developed and therefore they are less suffering from self-produced radio interference(rfi).

This talk gives an overview about the instrument array which is a project, initiated by UN and NASA. I will show some of the instrument locations/antennas with their advantages and disadvantages. Most important solar radio burst types will be shown and the advantage of redundant observations.

Abstract

Causal Dynamical Triangulations (CDT) is an approach to Quantum Gravity based on the sum over histories line of research which gives a quantization of classical Einstein gravity using a discrete approximation to the gravitational path integral, and spacetimes are approximated by Minkowskian equilateral triangles. This approach was developed by Renate Loll, Jan Ambjørn, and Jerzy Jurkiewicz. We have used a more recent version of CDT, called CDT without preferred foliation, to write a numerical simulation of quantum spacetimes in (1+1) dimensions. This talk comprises the full-fledged numerical implementation from how we can initialize triangulated spacetime in the form of a data structure to Monte-Carlo moves and finally, how you can contribute to the further development of our software.

Abstract

Without materials, there can be no condensed matter physics. Indeed, the synthesis of new materials is often the key starting point for advancing our fundamental understanding of underlying physics as well as pursuing technological development. I will start this talk by giving a broad overview of the quest for new materials – Why do we do it? How do we do it? I will then focus on a specific class of materials discovery, the Weyl semimetal, which is essentially a three-dimensional analog of graphene. As such, a Weyl semimetal is a conductor whose low-energy bulk excitations are Weyl fermions. To illustrate these characteristics, I will discuss our recent study of the Weyl semimetal NbAs, presenting magnetotransport signatures of Weyl fermions in this compound. Finally, I will briefly highlight some of our recent efforts in the area of topological matter, driven by specific materials design criteria.

Abstract

What is a galaxy and how does it form? I will address these fundamental questions of astronomy by focusing on the earliest stages of assembly, which can be explored by observing distant galaxies. In fact, because of the finite speed of light, distant objects are seen as they were in the past: The Hubble Space Telescope observations I will present are allowing us to reach as far as 13.3 billion light years away, showing us how galaxies looked like when the Universe was just 500 Million years old.

Abstract

The Cosmic-Ray Extremely Distributed Observatory (CREDO) is an infrastructure for global analysis of extremely extended cosmic-ray phenomena, so-called Cosmic Ray Ensembles (CREs), beyond the capabilities of existing discrete detectors and observatories. To date, cosmic-ray research at very high energies has revolved around the detection of air showers initiated by single primary cosmic ray particle, while the search for extremely extended cosmic ray air showers induced by CREs is a scientific terra incognita. Detection of CREs will have a significant impact on ultra-high energy astrophysics, cosmology and the physics of fundamental particle interactions as they can theoretically be formed within both classical (photon-photon interactions) and exotic (e.g., Super Heavy Dark Matter particle decay and interaction) scenarios. I will present the main objectives and current status of CREDO, and briefly discuss some reasons and ways to contribute to CREDO science as well through this talk.