4 papers
Constraining axion quadratic couplings with the Hulse-Taylor binary system
Ziwen Yin, Shyam Balaji, Malcolm Fairbairn +1
The orbital evolution of the Hulse-Taylor binary neutron star system is described to high precision by general relativity, in which gravity is the only long-range force and gravita…
Axion search with telescope for radio astronomy (ASTRA): forecast for observations between 0.5 and 4~GHz
Utkarsh Bhura, David J. E. Marsh, Bradley R. Johnson +8
Axion dark matter (DM) is predicted to convert into radio waves in neutron star magnetospheres. We assess the detectability of this signal using a 5 m radio telescope to be install…
Constraining the axiverse with reionization
Ziwen Yin, Hanyu Cheng, Eleonora Di Valentino +3
Axions that couple to electromagnetism are produced in the early Universe by, among other channels, freeze-in via the Primakoff process. For sufficiently large axion masses, the sa…
Constraining exotic high- reionization histories with Gaussian processes and the Cosmic Microwave Background
Hanyu Cheng, Ziwen Yin, Eleonora Di Valentino +2
The large-angle polarization anisotropies in the Cosmic Microwave Background (CMB) arise from Thomson scattering of CMB photons off free electrons in the post-recombination Univers…