1 citations · 3 across the 11 of their papers we have counts for
12 papers
Axion Hair and Pulsar Electrodynamics: modelling, discharge dynamics, and particle-in-cell simulations
Samuel J. Witte, Andrea Caputo, Stefan Stelzl +3
In a companion paper, we demonstrated that static axion field gradients sourced by dense nuclear matter (\emph{axion hair}) can dominate the near-field electrodynamics of old rotat…
High-Frequency Gravitational Waves from the Galactic Pulsar Population
Anne S. Freise, Jamie I. McDonald, Kirill Riabtsev +1
The high-frequency gravitational-wave band is often discussed primarily in the context of new physics, but realistic Standard-Model foregrounds remain incompletely characterized. W…
Simulating Axion Electrodynamics in Magnetized Plasmas: Energy transfer in the inhomogeneous and strongly varying limit
Fabrizio Corelli, Estanis Utrilla Ginés, Enrico Cannizzaro +2
In this work we study the electromagnetic response induced by axions in a magnetized plasma, focusing specifically on characterizing energy transfer and energy losses from the ambi…
The COSMIC WISPers White Paper: The physics case for Weakly Interacting Slim Particles
Ariel Arza, Deniz Aybas, Shyam Balaji +124
Axions and other very weakly interacting slim particles (WISPs), with masses below 1 GeV, arise naturally in many extensions of the Standard Model of particle physics. In particula…
Constraints on light QCD and CP-violating axions from the death line of rotation-powered pulsars
Samuel J. Witte, Andrea Caputo, Stefan Stelzl +3
Dense nuclear matter can modify the effective potential of axions, displacing them from their vacuum minimum, and sourcing large external field gradients (``axion hair"). In the ca…
Superradiance Constraints from GW231123
Andrea Caputo, Gabriele Franciolini, Samuel J. Witte
Gravitational wave observations have recently revealed with high significance, and high precision, the existence of rapidly rotating black holes, allo…
Searching for Axion Dark Matter Near Relaxing Magnetars
Sandip Roy, Anirudh Prabhu, Christopher Thompson +3
Axion dark matter passing through the magnetospheres of magnetars can undergo hyper-efficient resonant mixing with low-energy photons, leading to the production of narrow spectral…
Stepping Up Superradiance Constraints on Axions
Samuel J. Witte, Andrew Mummery
Light feebly-coupled bosonic particles can efficiently extract the rotational energy of rapidly spinning black holes on sub-astrophysical timescales via a phenomenon known as black…
Numerical Analysis of Resonant Axion-Photon Mixing: Part I
Estanis Utrilla Ginés, Dion Noordhuis, Christoph Weniger +1
Many present-day axion searches attempt to probe the mixing of axions and photons, which occurs in the presence of an external magnetic field. While this process is well-understood…
Pulsar Nulling and Vacuum Radio Emission from Axion Clouds
Andrea Caputo, Samuel J. Witte, Alexander A. Philippov +1
Non-relativistic axions can be efficiently produced in in the polar caps of pulsars, resulting in the formation of a dense cloud of gravitationally bound axions. Here, we investiga…
Adiabatic Axion-Photon Mixing Near Neutron Stars
Jonas Tjemsland, Jamie McDonald, Samuel J. Witte
One of the promising new proposals to search for axions in astrophysical environments is to look for narrow radio lines produced from the resonant conversion of axion dark matter f…
Generalized Ray Tracing for Axions in Astrophysical Plasmas
J. I. McDonald, S. J. Witte
Ray tracing plays a vital role in black hole imaging, modeling the emission mechanisms of pulsars, and deriving signatures from physics beyond the Standard Model. In this work we f…