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# EPS-HEP2021 conference

Jul 26 – 30, 2021
Zoom
Europe/Berlin timezone

## Upper limits on the amplitude of ultra-high-frequency gravitational waves from graviton to photon conversion

Jul 26, 2021, 11:20 AM
20m
Zoom

#### Zoom

Parallel session talk Astroparticle and Gravitational Waves

### Speaker

Aldo Ejlli (Cardiff University)

### Description

First experimental upper limits for stochastic ultra-high-frequency gravitational waves are obtained using data from existing facilities that have been constructed and operated to detect WISPs (Weakly Interacting Slim Particles). Using the graviton to photon conversion in the presence of their magnetic field, we exclude gravitational waves in the frequency bands from $\left(2.7 - 14\right)\times10^{14}$~Hz and $\left(5 - 12\right)\times10^{18}$~Hz down to a characteristic amplitude of $h_c^{\rm min}\approx6\times 10^{-26}$ and $h_c^{\rm min}\approx 5\times 10^{-28}$ at 95\% confidence level, respectively. This principle applies to all experiments of this kind, with prospects of constraining (or detecting), for example, stochastic gravitational waves background from light primordial black hole evaporation in the early universe.

Email ejllia@cardiff.ac.uk Cardiff University Aldo Ejlli

### Primary author

Aldo Ejlli (Cardiff University)