Göttingen 2025 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 7: Cosmo I, Relastro II, GW II

GR 7.2: Vortrag

Mittwoch, 2. April 2025, 13:50–14:10, ZHG008

Non-linear structure formation in Horndeski gravity — •Ashim Sen Gupta — Bielefeld University, Bielefeld, Germany

Precision cosmology is poised to enter a new era with the advent of Stage IV surveys, such as the Legacy Survey of Space and Time (LSST) and the Euclid satellite. With it will come the ability to probe scales of the universe where non-linear gravitational physics plays a strong role in the formation of large-scale structures (LSS). This provides an opportunity to constrain the elusive set of Modified Gravity (MG) theories with screening mechanisms, theories which can evade classical tests of General Relativity (GR). In this talk, I shall discuss my development of the hybrid particle-mesh code, Hi-COLA. It can rapidly simulate matter clustering for the Horndeski class of scalar-tensor theories. I will also discuss the phenomenology uncovered through the use of Hi-COLA, and present an analysis of the effects that give rise to the enhancements of the Horndeski matter power spectrum relative to GR. I shall additionally touch on my work to extend the scope of Hi-COLA to include the rarely-simulated K-mouflage gravity. Finally, I will conclude with an evaluation of the cutting edge in numerically predicting matter clustering for modified gravity, through which we will see the promise in the prospects of bridging theory and observation that will enable the application of Stage IV constraints.

Keywords: Large-scale structure; N-body; Horndeski Theory; Power Spectrum