2021
DOI: 10.48550/arxiv.2109.08676
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Natalie B. Hogg,
Marco Bruni

Abstract: In this paper we introduce a novel class of interacting vacuum models, based on recasting the equation of state originally developed in the context of lattice kinetic theory by Shan & Chen (1993) as the coupling between the vacuum and cold dark matter (CDM). This coupling allows the vacuum to evolve and is nonlinear around a characteristic energy scale 𝜌 * , changing into a linear coupling with a typical power law evolution at scales much lower and much higher than 𝜌 * . Focusing on the simplest sub-class of… Show more

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Cited by 1 publication
(4 citation statements)
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“…In the above Q denotes an energy flow in the rest frame of the fluid, while q µ is connected to momentum exchange between matter and vacuum. In this paper we shall consider the case in which the interaction reduces to a pure energy exchange [31,32,38,39,41] so that q µ = 0, simply because we shall focus on homogeneous-isotropic models where this restriction follows from symmetries. In this case, Q ν is parallel to the matter 4-velocity, Q ν = Qu ν , and matter is not accelerated due to its interaction with the vacuum.…”
Section: The Interacting Vacuum Equationsmentioning
confidence: 99%
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“…In the above Q denotes an energy flow in the rest frame of the fluid, while q µ is connected to momentum exchange between matter and vacuum. In this paper we shall consider the case in which the interaction reduces to a pure energy exchange [31,32,38,39,41] so that q µ = 0, simply because we shall focus on homogeneous-isotropic models where this restriction follows from symmetries. In this case, Q ν is parallel to the matter 4-velocity, Q ν = Qu ν , and matter is not accelerated due to its interaction with the vacuum.…”
Section: The Interacting Vacuum Equationsmentioning
confidence: 99%
“…In fact, if one assumes a non-relativistic perfect fluid, it can be shown that for q µ = 0 the matter distribution remains geodesic [37]. Constraints on the interacting vacuum in this geodesic CDM scenario were examined in [31,32,38,39,41].…”
Section: The Interacting Vacuum Equationsmentioning
confidence: 99%
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