GRChombo: An adaptable numerical relativity code for fundamental physics
The Journal of Open Source Software The Open Journal 6:68 (2021) 3703
Constraints on quantum gravity and the photon mass from gamma ray bursts
Physical Review D American Physical Society 104:10 (2021) 103516
Abstract:
Lorentz invariance violation in quantum gravity (QG) models or a nonzero photon mass, mγ, would lead to an energy-dependent propagation speed for photons, such that photons of different energies from a distant source would arrive at different times, even if they were emitted simultaneously. By developing source-by-source, Monte Carlo-based forward models for such time delays from gamma ray bursts, and marginalizing over empirical noise models describing other contributions to the time delay, we derive constraints on mγ and the QG length scale, ℓQG, using spectral lag data from the BATSE satellite. We find mγ<4.0×10-5 h eV/c2 and ℓQG<5.3×10-18 h GeV-1 at 95% confidence, and demonstrate that these constraints are robust to the choice of noise model. The QG constraint is among the tightest from studies which consider multiple gamma ray bursts and the constraint on mγ, although weaker than from using radio data, provides an independent constraint which is less sensitive to the effects of dispersion by electrons.Dynamical friction from scalar dark matter in the relativistic regime
Physical Review D American Physical Society (APS) 104:10 (2021) 103014
Euclid preparation
Astronomy & Astrophysics EDP Sciences 655 (2021) a44
The growth of density perturbations in the last ∼10 billion years from tomographic large-scale structure data
Journal of Cosmology and Astroparticle Physics IOP Publishing 10:2021 (2021) 030