50 Years of Horndeski Gravity: Exploring Modified Gravity

mochi_class: A tool to streamline cosmological analyses of Horndeski's gravity

Jul 17, 2024, 2:30 p.m.

15m

PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)

Contributed Talk Contributed Talks

Speaker

Dr Matteo Cataneo (University of Bonn)

Description

I will introduce mochi_class, a refined version of the popular Einstein-Boltzmann solver hi_class optimised for calculations within Horndeski's gravity framework. Thanks to (i) a re-parametrisation of Horndeski functions, (ii) a numerically stable quasi-static approximation, and (iii) support for time-dependent inputs, mochi_class enhances hi_class capabilities and nicely complements other public Einstein-Boltzmann solvers. Additionally, I will present a non-parametric approach that, when integrated with Principal Component Analysis, can effectively reconstruct Horndeski functions from well-studied modified gravity models, extending the exploration of scalar-tensor theories beyond conventional parametrisations. I will conclude by highlighting practical applications where mochi_class can prove instrumental in analysing current and forthcoming large-scale structure data.

External references

• 24070068
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