YOUNGST@RS - Feebly Interacting Sectors Impact on Cosmology & Astrophysics

Session

Direct detection and superradiance

3 Mar 2022, 16:00

Mainz Institute for Theoretical Physics, Johannes Gutenberg University

7. Experimental searches for axions

Igor Irastorza

03/03/2022, 16:00

Proposed more than 40 years ago, axions are still the most compelling solution to the strong CP problem of the Standard Model. More recently their physics case has been considerably sharpened, as well as that of similar axion-like particles (ALPs) that generically emerge in diverse high-energy extensions of the Standard Model, notably string theory. Both axion and ALPs constitute very...

8. Stellar Basins

Ken Van Tilburg

03/03/2022, 16:40

I will describe the phenomenology of stellar basins: volumetric stellar emission into gravitationally bound orbits of weakly coupled particles such as axions, moduli, hidden photons, and fermions. While only a tiny fraction of the instantaneous luminosity of a star (the vast majority of the emission is into relativistic modes), the continual injection of these particles into a small part of...

9. The piezoaxionic effect

Asimina Arvanitaki

03/03/2022, 17:20

Axion dark matter (DM) constitutes an oscillating background that violates parity and time-reversal symmtries. Inside piezoelectric crystals, where parity is broken spontaneously, this axion background can result in a stress. We call this new phenomenon "the piezoaxionic effect". When the frequency of axion DM matches the natural frequency of a bulk acoustic normal mode of the piezoelectric...

30. ALPHA: Towards a Plasma Haloscope

Alexander Millar

03/03/2022, 18:30

Plasma haloscopes are a novel method for the detection of the resonant conversion of axions to photons. Matching a tunable plasma frequency to the axion mass, allows for resonant conversion even if translation invariance is unbroken. Using a wire metamaterial one can create an artificial plasma, which is tuneable changing the interwire spacing, allowing for large conversion volumes. This talk...

31. Lumped element detection for low-mass axions: ABRACADABRA and DMRadio

Chiara Salemi

03/03/2022, 18:50

Axions with low masses (less than ~1 \mu eV) have wavelengths that are too large to fit inside a reasonably-sized experiment. In this regime, axion-photon interactions in a strong magnetic field produce an effective current that is in phase across an entire detector. This effective current can be inductively coupled to a circuit and read out using high-sensitivity amplifiers. ABRACADABRA-10...

32. Hunting for axions in the solar basin

Will De Rocco

03/03/2022, 19:10

A large flux of axion-like particles can be produced in the solar core. While the majority of these particles will have high velocities and escape the Sun’s gravitational pull, a small fraction of low-velocity particles will become trapped on bound orbits. Over time, an appreciable density of slow-moving axions can accumulate in this “solar basin.” Their subsequent decay to two photons...