Scalar field as a perfect fluid: thermodynamics of minimally coupled scalars and Einstein frame scalar-tensor gravityValerio Faraoni, Serena Giardino, Andrea Giusti and Robert VanderweeEur. Phys. J. C, 83 1 (2023) 24DOI: https://doi.org/10.1140/epjc/s10052-023-11186-7