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arXiv: 2006.08546
handle: 10261/226015 , 20.500.14352/6651
Abstract Gravitational particle production in the early universe is due to the coupling of matter fields to curvature. This coupling may include derivative terms that modify the kinetic term. The most general first order action contains derivative couplings to the curvature scalar and to the traceless Ricci tensor, which can be dominant in the case of (pseudo-)Nambu-Goldstone bosons or disformal scalars, such as branons. In the presence of these derivative couplings, the density of produced particles for the adiabatic regime in the de Sitter phase (which mimics inflation) is constant in time and decays with the inverse effective mass (which in turn depends on the coupling to the curvature scalar). In the reheating phase following inflation, the presence of derivative couplings to the background curvature modifies in a nontrivial way the gravitational production even in the perturbative regime. We also show that the two couplings — to the curvature scalar and to the traceless Ricci tensor — are drastically different, specially for large masses. In this regime, the production becomes highly sensitive to the former coupling while it becomes independent of the latter.
High Energy Physics - Theory, 53, Bogoliubov transformations, Física (Física), Física, FOS: Physical sciences, Effective Field Theories, QC770-798, Methods of quantum field theory in general relativity and gravitational theory, Effective field theories, Cosmology of Theories beyond the SM, classical theories of gravity, Astrophysical cosmology, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Theory (hep-th), Nuclear and particle physics. Atomic energy. Radioactivity, effective field theories, 22 Física, cosmology of theories beyond the SM, Classical Theories of Gravity
High Energy Physics - Theory, 53, Bogoliubov transformations, Física (Física), Física, FOS: Physical sciences, Effective Field Theories, QC770-798, Methods of quantum field theory in general relativity and gravitational theory, Effective field theories, Cosmology of Theories beyond the SM, classical theories of gravity, Astrophysical cosmology, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Theory (hep-th), Nuclear and particle physics. Atomic energy. Radioactivity, effective field theories, 22 Física, cosmology of theories beyond the SM, Classical Theories of Gravity
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