The presence of scalar fields with non-minimal gravitational interactions of the form ξ|φ|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.

Lattice simulations of non-minimally coupled scalar fields in the Jordan frame / Figueroa, D. G.; Florio, A.; Opferkuch, T.; Stefanek, B. A.. - In: SCIPOST PHYSICS. - ISSN 2542-4653. - 15:3(2023). [10.21468/SciPostPhys.15.3.077]

Lattice simulations of non-minimally coupled scalar fields in the Jordan frame

Opferkuch T.;Stefanek B. A.
2023-01-01

Abstract

The presence of scalar fields with non-minimal gravitational interactions of the form ξ|φ|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.
2023
15
3
077
10.21468/SciPostPhys.15.3.077
Figueroa, D. G.; Florio, A.; Opferkuch, T.; Stefanek, B. A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/138410
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