The evolving Planck mass in classically scale-invariant theories
| Autor: | Martti Raidal, Christian Spethmann, Kristjan Kannike, Hardi Veermäe |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
High Energy Physics - Theory Particle physics Nuclear and High Energy Physics 010308 nuclear & particles physics Dark matter Planck mass Scalar (physics) FOS: Physical sciences Scalar potential Cosmological constant Scale invariance 01 natural sciences Gravitational constant Theoretical physics High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Big Bang nucleosynthesis High Energy Physics - Theory (hep-th) 0103 physical sciences lcsh:QC770-798 Renormalization Group lcsh:Nuclear and particle physics. Atomic energy. Radioactivity 010306 general physics Classical Theories of Gravity |
| Zdroj: | Journal of High Energy Physics Journal of High Energy Physics, Vol 2017, Iss 4, Pp 1-28 (2017) |
| Popis: | We consider classically scale-invariant theories with non-minimally coupled scalar fields, where the Planck mass and the hierarchy of physical scales are dynamically generated. The classical theories possess a fixed point, where scale invariance is spontaneously broken. In these theories, however, the Planck mass becomes unstable in the presence of explicit sources of scale invariance breaking, such as non-relativistic matter and cosmological constant terms. We quantify the constraints on such classical models from Big Bang Nucleosynthesis that lead to an upper bound on the non-minimal coupling and require trans-Planckian field values. We show that quantum corrections to the scalar potential can stabilise the fixed point close to the minimum of the Coleman-Weinberg potential. The time-averaged motion of the evolving fixed point is strongly suppressed, thus the limits on the evolving gravitational constant from Big Bang Nucleosynthesis and other measurements do not presently constrain this class of theories. Field oscillations around the fixed point, if not damped, contribute to the dark matter density of the Universe. Comment: 28 pages, 2 figures, version published in JHEP |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|