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.
Authors / Affiliations: mappings to Contributors and OrganizationsSee all Organizations.
- 1 Instituto de Física Corpuscular / Institute for Corpuscular Physics [IFIC]
- 2 Stony Brook University [SUNY Stony Brook]
- 3 Organisation européenne pour la recherche nucléaire / European Organization for Nuclear Research [CERN]
- 4 Lawrence Berkeley National Laboratory [LBNL]
- 5 University of California, Berkeley [UCBL]
- 6 Universität Zürich / University of Zurich [UZH]
- Generalitat Valenciana
- Ministerio de Ciencia e Innovación
- Ministerio de Economía y Competitividad (MINECO) (through Organization: Ministerio de Economía, Industria y Competitividad / Ministry of Economy, Industry and Competitiveness [MINECO])