359 citations · 1k across the 29 of their papers we have counts for
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Signatures of High-Frequency Gravitational Waves in Electromagnetic Cavities
Sebastian Schenk, Kristof Schmieden, Pedro Schwaller
Similar to axions, gravitational waves (GW) can induce oscillating electromagnetic fields inside electromagnetic cavities. We explore their experimental sensitivity to monochromati…
Beyond the Daisy Chain: Running and the 3D EFT View of Supercooled Phase Transitions
Martin Christiansen, Eric Madge, Cristina Puchades-Ibáñez +2
Pulsar timing arrays have recently observed a stochastic gravitational wave background at nano-Hertz frequencies. This raises the question whether the signal can be of primordial o…
Superhorizon Isocurvature as a Window into Dark Matter Production
Christopher Gerlach, Wolfram Ratzinger, Pedro Schwaller
In the presence of primordial isocurvature perturbations, for example in a separate dark radiation sector, the superhorizon evolution of curvature perturbations becomes nontrivial.…
Generalized neutrino isocurvature
Christopher Gerlach, Wolfram Ratzinger, Pedro Schwaller
Searches for neutrino isocurvature usually constrain a specific linear combination of isocurvature perturbations. In this work, we discuss realistic cosmological scenarios giving r…
Supercooled Audible Axions
Christopher Gerlach, Daniel Schmitt, Pedro Schwaller
In the audible axion mechanism, axion-like particles source primordial gravitational waves via their coupling to a dark Abelian gauge field. The original setup, however, relies on…
ALP Production from Abelian Gauge Bosons: Beyond Hard Thermal Loops
Mathias Becker, Julia Harz, Enrico Morgante +2
Previous computations of feebly interacting particle production have encountered issues with unphysical (negative) interaction rates at soft momenta. We address this problem by stu…