2024/09/17 by Dennis Neumann, Robert Reischke, Neumann, Dennis +5 · 1 voice · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #Pulsars and Gravitational Waves Research #Radio Astronomy Observations and Technology
paper · doi:10.33232/001c.140864
openalex created_date 2024/10/24 · openalex publication_date 2025/06/17 · openalex updated_date 2026/08/03
We explore the potential for improving constraints on gravity by leveraging correlations in the dispersion measure derived from Fast Radio Bursts (FRBs) in combination with cosmic shear. Specifically, we focus on Horndeski gravity, inferring the kinetic braiding and Planck mass run rate from a stage-4 cosmic shear mock survey alongside a survey comprising <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mn>10</mml:mn> <mml:mn>4</mml:mn> </mml:msup> </mml:math> FRBs. For the inference pipeline, we utilise the Boltzmann code hiclass to predict the linear matter power spectrum in modified gravity scenarios, while non-linear corrections are obtained from the halo-model employed in HMcode, including feedback mechanisms. Our findings indicate that FRBs can disentangle degeneracies between baryonic feedback and cosmological parameters, as well as the mass of massive neutrinos. Since these parameters are also degenerate with modified gravity parameters, the inclusion of FRBs can enhance constraints on Horndeski parameters by up to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mn>40</mml:mn> </mml:math> percent, despite being a less significant measurement. Additionally, we apply our model to current FRB data and use the uncertainty in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mrow> <mml:mi mathvariant="normal">D</mml:mi> <mml:mi mathvariant="normal">M</mml:mi> </mml:mrow> <mml:mo>−</mml:mo> <mml:mi>z</mml:mi> </mml:mrow> </mml:math> relation to impose limits on gravity. However, due to the limited sample size of current data, constraints are predominantly influenced by theoretical priors. Despite this, our study demonstrates that FRBs will significantly augment the limited set of cosmological probes available, playing a critical role in providing alternative tests of feedback, cosmology, and gravity. All codes used in this work are made publically available.