Cav, I can relate to what you are saying. It appears reasonable to me that if an aether was to exist, which i think it does, it would be of variable density, particularly where it surrounds mass.
I don't think the aether has a variable density. Not one that could be measured anyways. Aether has mass, so saying "particularly where it surrounds mass" is not quite accurate. It is more accurate to say "particularly where it surrounds matter".
The following articles describe the aether as an incompressible fluid.
The aether is, or behaves similar to, a supersolid, which is described in the following article as the 'fluidic' nature of space itself. The article describes a 'back reaction' associated with the 'fluidic' nature of space itself. This is the displaced aether 'displacing back'.
'An Extended Dynamical Equation of Motion, Phase Dependency and Inertial Backreaction'
arxiv.org/abs/1208.3458
"We hypothesize that space itself resists such surges according to a kind of induction law (related to inertia); additionally, we provide further evidence of the “fluidic” nature of space itself. This "back-reaction" is quantified by the tendency of angular momentum flux threading across a surface."
The following article describes the aether as that which produces resistance to acceleration and is responsible for the increase in mass of an object with velocity and describes the "space-time ideal fluid approach from general relativity."
'Fluidic Electrodynamics: On parallels between electromagnetic and fluidic inertia'
arxiv.org/abs/1202.4611
"It is shown that the force exerted on a particle by an ideal fluid produces two effects: i) resistance to acceleration and, ii) an increase of mass with velocity. ... The interaction between the particle and the entrained space flow gives rise to the observed properties of inertia and the relativistic increase of mass. ... Accordingly, in this framework the non resistance of a particle in uniform motion through an ideal fluid (D’Alembert’s paradox) corresponds to Newton’s first law. The law of inertia suggests that the physical vacuum can be modeled as an ideal fluid, agreeing with the space-time ideal fluid approach from general relativity."
The relativistic mass of an object is the mass of the object and the mass of the aether connected to and neighboring the object which is displaced by the object. The faster an object moves with respect to the state of the aether in which it exists the greater the displacement of the aether by the object the greater the relativistic mass of the object.
'Comment on the higher derivative Lagrangians in relativistic theory'
arxiv.org/pdf/1305.5759.pdf
"
Einstein theory of gravitational fields and this gives a new perspective on the Mach principle revisiting the “absolute” acceleration concept as a natural motion in space-time deformed by the matter-energy contained therein. We refer the reader to the paper of Einstein on a related topic [9]. The relativistic theory of an Aether was discussed several time, see for e.g. [8], [9]. In this paper, our hypothesis is different and gives a relativistic theory of the deformation of continuous media (for which the geometry is described by the metric field)."
The deformation of continuous media is the state of displacement of the aether.
The geometrical representation of gravity as curved spacetime physically exists in nature as the state of displacement of the aether.
The incompressible fluid described in the following article is the gravitational aether which "the theory reduces to GR coupled to an incompressible fluid."
'Empty Black Holes, Firewalls, and the Origin of Bekenstein-Hawking Entropy'
arxiv.org/abs/1212.4176
"But why an incompressible fluid? The reason comes from an attempt to solve the (old) cosmological constant problem, which is arguably the most puzzling aspect of coupling gravity to relativistic quantum mechanics [13]. Given that the natural expectation value for the vacuum of the standard model of particle physics is ∼ 60 orders of magnitude heavier than the gravitational measurements of vacuum density, it is reasonable to entertain an alternative theory of gravity where the standard model vacuum decouples from gravity. Such a theory could be realized by coupling gravity to the traceless part of the quantum mechanical energy-momentum tensor. However, the consistency/covariance of gravitational field equations then requires introducing an auxiliary fluid, the so-called gravitational aether [14]. The simplest model for gravitational aether is an incompressible fluid (with vanishing energy density, but non-vanishing pressure), which is currently consistent with all cosmological, astrophysical, and precision tests of gravity [15, 16]:
__3__
32πGN Gμν = Tμν − Tα gμν + Tμν ,
Tμν = p (uμ uν + gμν ), T μν;ν = 0,
where GN is Newton’s constant, Tμν is the matter energy momentum tensor and Tμν is the incompressible gravitational aether fluid. In vacuum, the theory reduces to GR coupled to an incompressible fluid."
The following article describes the aether as an incompressible fluid resulting in what the article refers to as gravitational aether caused by pressure (or vorticity).
'Phenomenology of Gravitational Aether as a solution to the Old Cosmological Constant Problem'
arxiv.org/abs/1106.3955
"One proposal to address this puzzle at the semi-classical level is to decouple quantum vacuum from space-time geometry via a modification of gravity that includes an incompressible fluid, known as Gravitational Aether. In this paper, we discuss classical predictions of this theory along with its compatibility with cosmological and experimental tests of gravity. We argue that deviations from General Relativity (GR) in this theory are sourced by pressure or vorticity."