A thermodynamic model of inflation without inflaton field
Anaya-Galeana J. Luongo O. Quevedo H.
December 2024Elsevier B.V.
Physics of the Dark Universe
2024#46
In the framework of geometrothermodynamics, we explore how to construct an inflationary cosmic fluid without requiring inflaton fields. To do so, we employ standard radiation and matter as barotropic background, speculating on the existence of a further real fluid, interpreted as a possible matter with pressure constituent. We thus illustrate its main characteristics, showing how it may face the flatness and horizon problems, yielding an equivalent number of e-foldings, compatible with theoretical expectations. Moreover, we calculate the associated equilibrium and kinetic temperatures, and compute out-of-equilibrium properties, in terms of particle production and effective reheating mechanism. Accordingly, we revise how inflation ends and how to fix the free parameters of our model from observations. Last but not least, we propose how to obtain a bare cosmological constant that could relate the late-time acceleration to inflation, aiming to unify the two approaches. Finally, we discuss the corresponding theoretical implications of our treatment in contrast to the standard approach reliant on scalar field potentials, emphasizing the main advantages and disadvantages.
Geometrothermodynamics , Inflation , Particle production , Reheating , Scalar fields
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Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, AP 70543, México, DF 04510, Mexico
School of Science and Technology, University of Camerino, Via Madonna delle Carceri, Camerino, 62032, Italy
Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Perugia, Perugia, 06123, Italy
SUNY Polytechnic Institute, Utica, 13502, NY, United States
INAF - Osservatorio Astronomico di Brera, Milano, Italy
Al-Farabi Kazakh National University, Al-Farabi av. 71, Almaty, 050040, Kazakhstan
Dipartimento di Fisica and Icra, Università di Roma “La Sapienza”, Piazzale Aldo Moro 5, Roma, I-00185, Italy
Instituto de Ciencias Nucleares
School of Science and Technology
Istituto Nazionale di Fisica Nucleare (INFN)
SUNY Polytechnic Institute
INAF - Osservatorio Astronomico di Brera
Al-Farabi Kazakh National University
Dipartimento di Fisica and Icra
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