Zobrazeno 1 - 10
of 144
pro vyhledávání: '"Witte, Samuel J."'
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 in a number of simple and idealized contexts, a strongly varying or h
Externí odkaz:
http://arxiv.org/abs/2405.08865
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 investigate the interplay between such an axion cloud and the electrodynamics i
Externí odkaz:
http://arxiv.org/abs/2311.14795
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 falling through the magnetospheres of neutron stars. For sufficiently s
Externí odkaz:
http://arxiv.org/abs/2310.18403
Recent work has shown that axions can be efficiently produced via non-stationary pair plasma discharges in the polar cap region of pulsars. Here, we point out that for axion masses $10^{-9} \, {\rm eV} \lesssim m_a \lesssim 10^{-4} \, \rm eV$, a siza
Externí odkaz:
http://arxiv.org/abs/2307.11811
Publikováno v:
Eur.Phys.J.C 83 (2023) 8, 709
The cosmic microwave background (CMB) has proven to be an invaluable tool for studying the properties and interactions of neutrinos, providing insight not only into the sum of neutrino masses but also the free streaming nature of neutrinos prior to r
Externí odkaz:
http://arxiv.org/abs/2305.01692
Autor:
Saxena, Anchal, Cole, Alex, Gazagnes, Simon, Meerburg, P. Daniel, Weniger, Christoph, Witte, Samuel J.
Publikováno v:
MNRAS 525 (2023) 6097-6111
Cosmic Dawn (CD) and Epoch of Reionization (EoR) are epochs of the Universe which host invaluable information about the cosmology and astrophysics of X-ray heating and hydrogen reionization. Radio interferometric observations of the 21-cm line at hig
Externí odkaz:
http://arxiv.org/abs/2303.07339
Autor:
Witte, Samuel J., Baum, Sebastian, Lawson, Matthew, Marsh, M. C. David, Millar, Alexander J., Salinas, Gustavo
Gravitationally bound clumps of dark matter axions in the form of 'miniclusters' or even denser 'axion stars' can generate strong radio signals through axion-photon conversion when encountering highly magnetised neutron star magnetospheres. We system
Externí odkaz:
http://arxiv.org/abs/2212.08079
Autor:
Noordhuis, Dion, Prabhu, Anirudh, Witte, Samuel J., Chen, Alexander Y., Cruz, Fábio, Weniger, Christoph
Axions can be copiously produced in localized regions of neutron star magnetospheres where the ambient plasma is unable to efficiently screen the induced electric field. As these axions stream away from the neutron star they can resonantly transition
Externí odkaz:
http://arxiv.org/abs/2209.09917
While Primordial Black Holes (PBHs) with masses $M_{\rm PBH} \gtrsim 10^{-11} \, M_\odot$ cannot comprise the entirety of dark matter, the existence of even a small population of these objects can have profound astrophysical consequences. A sub-domin
Externí odkaz:
http://arxiv.org/abs/2207.09481
Autor:
Boddy, Kimberly K., Lisanti, Mariangela, McDermott, Samuel D., Rodd, Nicholas L., Weniger, Christoph, Ali-Haïmoud, Yacine, Buschmann, Malte, Cholis, Ilias, Croon, Djuna, Erickcek, Adrienne L., Gluscevic, Vera, Leane, Rebecca K., Mishra-Sharma, Siddharth, Muñoz, Julian B., Nadler, Ethan O., Natarajan, Priyamvada, Price-Whelan, Adrian, Vegetti, Simona, Witte, Samuel J.
While astrophysical and cosmological probes provide a remarkably precise and consistent picture of the quantity and general properties of dark matter, its fundamental nature remains one of the most significant open questions in physics. Obtaining a m
Externí odkaz:
http://arxiv.org/abs/2203.06380