2016/02/16 by Guillem Domènech, Misao Sasaki
Physics and Astronomy · #Advanced Differential Geometry Research #Astronomy #Black Holes and Theoretical Physics #Classical mechanics #Conformal map #Cosmological model #Cosmology #Cosmology and Gravitation Theories #Dark energy #Geometry #Non-standard cosmology #Physical cosmology #Physics #Quantum gravity #Quantum mechanics #String cosmology #Theoretical physics #astro-ph.CO #gr-qc
paper · pdf · doi:10.1142/s0218271816450061
Plenary talk given at the 2nd LeCosPA Symposium: Everything about Gravity
arxiv created 2016/02/16 · openalex publication_date 2016/07/15 · arxiv updated 2016/11/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
From higher dimensional theories, e.g. string theory, one expects the presence of nonminimally coupled scalar fields. We review the notion of conformal frames in cosmology and emphasize their physical equivalence, which holds at least at a classical level. Furthermore, if there is a field, or fields, which dominates the universe, as it is often the case in cosmology, we can use such notion of frames to treat our system, matter and gravity, as two different sectors. On one hand, the gravity sector which describes the dynamics of the geometry and on the other hand, the matter sector which has such geometry as a playground. We use this interpretation to build a model where the fact that a curvaton couples to a particular frame metric could leave an imprint in the cosmic microwave background (CMB).