TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.15.3.077
TI  - Lattice simulations of non-minimally coupled scalar fields in the Jordan frame
PY  - 2023/09/04
UR  - https://scipost.org/SciPostPhys.15.3.077
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 15
IS  - 3
SP  - 077
A1  - Figueroa, Daniel
AU  - Florio, Adrien
AU  - Opferkuch, Toby
AU  - Stefanek, Benjamin
AB  - The presence of scalar fields with non-minimal gravitational interactions of the form $\xi |\phi|^2 R$ may have important implications for the physics of the early universe. We propose a procedure to solve the dynamics of non-minimally coupled scalar fields directly in the Jordan frame, where the non-minimal couplings are maintained explicitly. Our algorithm can be applied to lattice simulations that include minimally coupled fields and an arbitrary number of non-minimally coupled scalars, with the expansion of the universe sourced by all fields present. This includes situations when the dynamics become fully inhomogeneous, fully non-linear (due to e.g. backreaction or mode rescattering effects), and/or when the expansion of the universe is dominated by non-minimally coupled species. As an example, we study geometric preheating with a non-minimally coupled scalar spectator field when the inflaton oscillates following the end of inflation.
ER  -

@Article{10.21468/SciPostPhys.15.3.077,
	title={{Lattice simulations of non-minimally coupled scalar fields in the Jordan frame}},
	author={Daniel G. Figueroa and Adrien Florio and Toby Opferkuch and  and Ben A. Stefanek},
	journal={SciPost Phys.},
	volume={15},
	pages={077},
	year={2023},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.15.3.077},
	url={https://scipost.org/10.21468/SciPostPhys.15.3.077},
}