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no code implementations • 11 Mar 2021 • Viraf M. Mehta, Mehmet Demirtas, Cody Long, David J. E. Marsh, Liam McAllister, Matthew J. Stott

We perform an extensive analysis of the statistics of axion masses and interactions in compactifications of type IIB string theory, and we show that black hole superradiance excludes some regions of Calabi-Yau moduli space.

High Energy Physics - Theory Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology

no code implementations • 19 Jul 2018 • David J. E. Marsh, Kin-Chung Fong, Erik W. Lentz, Libor Šmejkal, Mazhar N. Ali

Antiferromagnetically doped topological insulators (A-TI) are among the candidates to host dynamical axion fields and axion-polaritons; weakly interacting quasiparticles that are analogous to the dark axion, a long sought after candidate dark matter particle.

High Energy Physics - Phenomenology Mesoscale and Nanoscale Physics Strongly Correlated Electrons High Energy Physics - Experiment Instrumentation and Detectors

1 code implementation • 5 May 2018 • Matthew J. Stott, David J. E. Marsh

Astrophysical observations of spinning BHs, which span $ 5M_\odot\lesssim M_{\rm BH}\lesssim 5\times 10^8 M_\odot$, can be used to exclude the existence of certain massive bosons via the superradiance phenomenon.

High Energy Physics - Phenomenology High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology High Energy Physics - Theory

2 code implementations • 18 Aug 2017 • Renée Hlozek, David J. E. Marsh, Daniel Grin

The window of co-existence will be fully probed by proposed CMB-S4 observations with increased accuracy in the high-$\ell$ lensing power and low-$\ell$ $E$ and $B$-mode polarisation.

Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology

1 code implementation • 10 Jun 2017 • Matthew J. Stott, David J. E. Marsh, Chakrit Pongkitivanichkul, Layne C. Price, Bobby S. Acharya

We compute the background cosmological (quasi-)observables for models with a large number of axion fields, $n_{\rm ax}\sim \mathcal{O}(10-100)$, with the masses and decay constants drawn from statistical distributions.

Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory

2 code implementations • 27 Jul 2016 • Renée Hložek, David J. E. Marsh, Daniel Grin, Rupert Allison, Jo Dunkley, Erminia Calabrese

CMB data have already shown that ultra-light axions (ULAs) with mass in the range $10^{-32}~{\rm eV} \to 10^{-26}~{\rm eV}$ compose a fraction $< 0. 01$ of the cosmological critical density.

Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology

2 code implementations • 10 Oct 2014 • Renée Hlozek, Daniel Grin, David J. E. Marsh, Pedro G. Ferreira

For m < 10^{-32} eV, ULAs are allowed to compose a significant fraction of the dark energy.

Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment High Energy Physics - Phenomenology High Energy Physics - Theory

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