In 2022, GRB221009A was detected by the LHAASO collaboration as the brightest gamma-ray burst (GRB) ever recorded with photon energies that extended up to 18TeV. Combined with the redshift of $z=0.151$ of the GRB, it has been questioned whether these observations can be reconciled with standard physics, since such high energy photons suffer from absorption on the extragalactic background light...
Axion-like particles and similar new pseudoscalar bosons coupled to nucleons and electrons are known to lead to spin-dependent forces in atoms and ions. We argue that hyperfine structure measurements in the hydrogen- and lithium-like charge states are a sensitive probe to this effect. Focusing on specific differences reduces uncertainties due to nuclear effects in hyperfine structure...
Neutrinos are elementary particles that interact only very weakly with matter. Neutrino experiments are therefore usually big, with masses on the multi-ton scale. The thresholdless interaction of coherent elastic neutrino-nucleus scattering (CEνNS) leads to drastically enhanced interaction rates, which allows for much smaller detectors. This could open the path for reactor monitoring through...
Cosmological models featuring QCD axions or axion-like particles (ALPs) can face a serious domain wall (DW) problem when the domain wall number $N_{DW}$, exceeds unity. While biased potentials are a commonly proposed solution, we explore alternative mechanisms based on thermal plasma friction.
Using techniques from nonequilibrium quantum field theory, we evaluate the quantum equations of...
A critical challenge in cavity haloscope experiments is the development of fast and wide-range frequency tuning systems. One promising approach is to incorporate qubits based on DC SQUIDs into the cavity, where the qubit-cavity interaction is controlled by an external magnetic flux [1]. This non-mechanical method is particularly attractive for fast scanning, as it avoids the frictional heating...
We explore how gravitational wave detectors, such as LIGO and Virgo, can be leveraged to search for spin-2 ultralight dark matter. These particles are expected to produce a continuous signal, making them well-suited for search methods originally developed for continuous gravitational waves. In this context, we develop a search using the Band Sampled Data framework (a gravitational wave data...
