3 papers
astro-ph.CO2025
A novel test of gravity: Does spacetime geometry track matter density?
Camille Bonvin, Nastassia Grimm, Isaac Tutusaus
We propose a novel test of gravity that combines galaxy clustering with gravitational lensing. In general relativity, the evolution of matter density fluctuations and of the Weyl p…
gr-qc2024
The impact of large-scale galaxy clustering on the variance of the Hellings-Downs correlation: numerical results
Nastassia Grimm, Martin Pijnenburg, Giulia Cusin +1
Pulsar timing array experiments have recently found evidence for a stochastic gravitational wave (GW) background, which induces correlations among pulsar timing residuals described…
astro-ph.CO2024
Probing CDM through the Weyl potential and machine learning forecasts
Rubén Arjona, Savvas Nesseris, Isaac Tutusaus +2
For years, the cosmological constant and cold dark matter (CDM) model () has stood as a cornerstone in modern cosmology and serves as the predominant theoretical f…