TY  - JOUR
AU  - Figueroa, D. G.
AU  - Florio, A.
AU  - Opferkuch, T.
AU  - Stefanek, B.
PY  - 2023
DA  - 2023//
TI  - Lattice simulations of non-minimally coupled scalar fields in the Jordan frame
T2  - SciPost Phys.
JO  - Scipost Physics
SP  - 077
EP  - 28pp
VL  - 15
IS  - 3
PB  - Scipost Foundation
AB  - The presence of scalar fields with non-minimal gravitational interactions of the form & xi;|& phi;|2R 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.
SN  - 2542-4653
UR  - https://arxiv.org/abs/2112.08388
UR  - https://doi.org/10.21468/SciPostPhys.15.3.077
DO  - 10.21468/SciPostPhys.15.3.077
LA  - English
N1  - WOS:001065573600001
ID  - Figueroa_etal2023
ER  -