1 code implementation • 27 Jun 2018 • Vivian Poulin, Tristan L. Smith, Daniel Grin, Tanvi Karwal, Marc Kamionkowski
Cosmological observations are used to test for imprints of an ultra-light axion-like field (ULA), with a range of potentials $V(\phi)\propto[1-\cos(\phi/f)]^n$ set by the axion-field value $\phi$ and decay constant $f$.
Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology
3 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
3 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
3 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
no code implementations • 15 Nov 2006 • Daniel Grin, Giovanni Covone, Jean-Paul Kneib, Marc Kamionkowski, Andrew Blain, Eric Jullo
A search for optical line emission from the two-photon decay of relic axions was conducted in the galaxy clusters Abell 2667 and 2390, using spectra from the VIMOS (Visible Multi-Object Spectrograph) integral field unit at the Very Large Telescope.
astro-ph High Energy Physics - Phenomenology
