170 citations · 171 across the 2 of their papers we have counts for
7 papers
Constraints on Global Symmetry Breaking in Quantum Gravity from Cosmic Birefringence Measurements
James Alvey, Miguel Escudero Abenza
All global symmetries are expected to be explicitly broken by quantum gravitational effects, and yet may play an important role in Particle Physics and Cosmology. As such, any evid…
New Constraints on the Mass of Fermionic Dark Matter from Dwarf Spheroidal Galaxies
James Alvey, Nashwan Sabti, Victoria Tiki +7
Dwarf spheroidal galaxies are excellent systems to probe the nature of fermionic dark matter due to their high observed dark matter phase-space density. In this work, we review, re…
The Axion Quality Problem: Global Symmetry Breaking and Wormholes
James Alvey, Miguel Escudero
Continuous global symmetries are expected to be broken by gravity, which can lead to important phenomenological consequences. A prime example is the threat that this poses to the v…
Refined Bounds on MeV-scale Thermal Dark Sectors from BBN and the CMB
Nashwan Sabti, James Alvey, Miguel Escudero +2
New light states thermally coupled to the Standard Model plasma alter the expansion history of the Universe and impact the synthesis of the primordial light elements. In this work,…
Improved BBN Constraints on the Variation of the Gravitational Constant
James Alvey, Nashwan Sabti, Miguel Escudero +1
Big Bang Nucleosynthesis (BBN) is very sensitive to the cosmological expansion rate. If the gravitational constant took a different value during the nucleosynthesis epoch than…
Light Dark Matter from Inelastic Cosmic Ray Collisions
James Alvey, Miguel Campos, Malcolm Fairbairn +1
Direct detection experiments relying on nuclear recoil signatures lose sensitivity to sub-GeV dark matter for typical galactic velocities. This sensitivity is recovered if there ex…