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Elementary particle physics relates in many diverse ways to fundamental questions of the universe. What makes up the "dark matter" that determines the dynamics of galaxies and cosmic structures? What explanation can account for the "dark energy" that is causing the expansion of the universe to accelerate? Why is there normal matter in the universe, but hardly any antimatter? What role do neutrinos play in cosmology and astrophysics? Where are the astrophysical accelerators that are responsible for high-energy cosmic rays?
The theoretical astroparticle group is engaged with some of these fundamental questions. One central topic is exploring what influence neutrinos have on supernova explosions, and what can be learned from that about the properties of neutrinos. A special area of focus is investigating the role of novel particles that interact even more weakly than neutrinos, as candidates for dark matter. Examples are the so-called axions or sterile neutrinos. Furthermore, the group ties together findings from astrophysical and cosmological observations with the results of ground-based experiments, to maximize our knowledge of particle physics.
Fast Pairwise Conversion of Supernova Neutrinos: A Dispersion-Relation Approach
I. Izaguirre, G. Raffelt, I. Tamborra
Phys.Rev.Lett. 118 (2017) 021101
Dielectric haloscopes: A new way to detect axion dark matter
A. Caldwell, G. Dvali, B. Majorovits, A. Millar, G. Raffelt,
J. Redondo, O. Reimann, F. Simon, F. Steffen
(MADMAX Working Group).
Phys.Rev.Lett. 118 (2017) 091801
Primordial gravitational waves, precisely: The role of thermodynamics in the Standard Model
K. Saikawa, S. Shirai
JCAP 1805 (2018) 035
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