The former MAGO collaboration, led by INFN Genoa, developed in the past SRF cavities in order to perform R&D with the aim to search for gravitational waves. In a collaborative effort, DESY/U.Hamburg and Fermilab continues this R&D programme. Since July the MAGO cavity is at DESY for measurements and matching simulations to characterise the cavity before surface treatment and cold measurements...
Patterned thin films that are freely suspended from a silicon chip (i.e., membranes) are some of the lowest-loss mechanical oscillators.
As such, they provide an exceptional level of isolation from the noisy environment, similar to what has been achieved with levitated nanoparticles.
Here, I will present a concept for a HFGW detector, which corresponds to a Michelson interferometer with...
A key dividing line in the dark matter community is between the wave and particle regimes. This division can be applied to any bosonic state, and for gravitational energy density the boundary cuts right through the ultra-high frequency regime. I will discuss the implications of this for instruments looking to detect a signal in the regime where gravity is a dilute gas of gravitons, and explain...
ABRACADABRA-10cm has had great success as a lumped-element axion dark matter pathfinder experiment. Now, using the electrodynamics of gravitational waves and a simple change of pickup structures, we are using the ABRACADABRA detector to search for high-frequency gravitational wave in the kHz to MHz range. These higher frequencies may indicate signs of in-spiraling primordial black holes, or...
Primordial Black Holes might have originated in the early universe from the collapse of large overdensities and could constitute a sizeable portion of dark matter. Recently, they have gained considerable attention because of the various gravitational wave (GW) signatures associated with this scenario, making them testable with current and future GW experiments. In this talk, I will provide an...
Since the models of inflation compatible with CMB data require non-renormalizable inflaton potentials, it is natural to have extra couplings between inflaton and gravitons. The suppression scale of such operators can well be lower than the Planck scale. Due to these couplings, inflaton can produce high frequency gravitons during reheating due to both decay and bremsstrahlung process. In my...
The thermal plasma in the early universe produced a guaranteed stochastic gravitational wave (GW) background, which peaks today in the microwave regime and was dubbed the cosmic gravitational microwave background (CGMB). The CGMB spectrum encodes fundamental information about particle physics and gravity at ultra high energies. In particular, one can determine from the CGMB spectrum the...
There has recently been an increased interest in electro-magnetic GW detectors, due to the first detections of GWs and the rapid evolution of the technology driven by searches for light dark matter. The question how to calculate the response of e.g. a cavity to a GW has been debated since the 80s and the current understanding is that the usage of a special frame, the proper detector frame, is...
Recent advances in high-energy and high-peak-power laser systems have opened up new possibilities for fundamental physics research.
I propose to discuss the potential of twisted light for the generation of gravitational waves in the high frequency regime.
Focusing on Bessel beams, analytic expressions and numerical computations for the generated metric perturbations and associated powers...
In this talk I will try to clarify the situation about astrophysical sources that might be observed with haloscope experiments like GrAHal, sensitive to gravitational waves in the 1-10 GHz band. The GrAHal setup is taken as a benchmark. We follow a very pedagogical path so that the full analysis can easily be used by the entire community who might not be familiar with the theoretical...
