https://doi.org/10.1140/epjp/s13360-023-03984-5
Regular Article
Effective fluid mixture of tensor-multi-scalar gravity
1
Scuola Superiore Meridionale, Largo San Marcellino 10, 80138, Napoli, Italy
2
INFN Sezione di Napoli, Complesso Universitario di Monte Sant’Angelo, Edificio G, Via Cinthia, 80126, Napoli, Italy
3
Department of Physics, Université de Sherbrooke, 2500 Boulevard de l’Université, J1K 2R1, Sherbrooke, QC, Canada
4
Department of Physics & Astronomy, Bishop’s University, 2600 College Street, J1M 1Z7, Sherbrooke, QC, Canada
Received:
12
November
2022
Accepted:
13
April
2023
Published online:
6
May
2023
We apply to tensor-multi-scalar gravity the effective fluid analysis based on the representation of the gravitational scalar field as a dissipative effective fluid. This generalization poses new challenges as the effective fluid is now a complicated mixture of individual fluids mutually coupled to each other, and many reference frames are possible for its description. They are all legitimate, although not all convenient for specific problems, and they give rise to different physical interpretations. Two of these frames are highlighted, and implications for cosmology are pointed out.
© The Author(s) 2023
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