Since a universe travels from a state of low entropy to a state of high entropy, it must be assumed that the universe at its death is at a state of extremely high entropy (presumbaly, ultimate entropy at the death of an intact universe), and that it dissolves into the Anaverse in this state. Which begs the question: What is the role of entropy in the Anaverse?
One possibility is that entropy is entirely irrelevant to the Anaverse, that it simply isn't structured that way. Entropy becomes a clock of the life of the universe, and is only relevant to the universe itself.
Another possibility is that the Anaverse is in a state of ultimate entropy, with no discernible organization whatsoever. This, then, implies a process whereby entropy is "stripped" upon the entry of substance from the Anaverse into the new universe. Of course, we have a similar problem contemplating the birth matter from the parent universe; it could be that the compression of the matter into the singularity in the parent universe removes its entropy (which, in turn, must increase the entropy of the outside parent universe as the singularity forms).
Yet another possibility is that the Anaverse is in a state of no entropy with absolute homogeneity. This seems unlikely, since the dissolution of a universe into the Anaverse would disrupt such a homogeneous state, and since then the input into each new universe would be exactly the same mix, which we think, in our vanity that every universe is different, is not the case.
Of course, if the laws of each universe are set only by the process of the birth of the universe, and are irrelevant to the influx of substance from the Anaverse, then the substances that do not easily conform to the laws of each universe could compose the dark matter and dark energy that are so mysterious to us, while the substances that do conform make up the physical world with which we're familiar.
However, that scenario could be true even if the influx is from an Anaverse that is far from homogeneous.
As I've demonstrated, gravity cannot operate solely within the space-time continuum with which we're familiar it must be operating partially within another realm. Could that realm be a boundary zone, or "shell," between the universe and the Anaverse? Of course, this cannot exist as a shell or container in our 3 or 4-dimensional sense, since such a shell must be in contact with every point in the universe simultaneously. But this would be a "place" where the strict rules of the universe do not wholly apply, but neither does the "chaos" structured (not really chaos) or unstructured (true chaos) of the Anaverse. In short, within this shell, additional dimensions are accessible, which would facilitate the propagation of gravity.
This shell is remarkably coincident with the science-fictional concept of "hyperspace." Hyperspace has long been used as a plot device, without scientific basis, as a way of circumventing the restrictive laws of the known universe, but perhaps it really does exist, in this sense. In fact, this hyperspace might help explain the apparent generation of spontaneous particles better than would the idea of a simple pervious boundary between the universe and the Anaverse.
This is a recapitulation and brief explanation of five conceptual components of the cosmos.
Conventional physics referring to four-dimensional "space-time" clearly is inadequate. String theory requires a minimum of ten dimensions, while M-theory requires eleven. If two conditions are clearly met, then we must go even beyond those. First, if the mathematics of geometry validly transfer to the requirements of the sets of physical laws for the omniverse, and second, if symmetry is a critical principle in those laws. THEN we can reasonably assume that there are, in fact, twelve or sixteen dimensions, not just ten or eleven.
Twelve dimensions would allow for four sets of three dimensions, or three sets of four. However, this does not allow the ultimate symmetry that sixteen would, with four sets of four. If we work based on the hypothesis that there are four sets of four, then we can clearly assign one set to dimensions of space. Some would assume that time is then a fourth dimension within that set, and that it would be space-time, the particular dimensional set that manifests within our universe. However, we might also assume that there are in fact four dimensions of space exclusive of time, and that time is four-dimensional, occupying an entire dimensional set in its own right. That leaves two sets of dimensions. We know that the odd characteristic of particles called "spin" has essentially three non-zero values on the positve axis and three more on the negative; we may assume that this is a manifestation of a dimensional set, hidden within the quantum level -- which is more or less what one might expect.
So what would be the fourth dimensional set? Unknown at this time, but it might well manifest at either the quantum or macroscopic level within dark matter. Could a universe exist in which there are only one or two dimensions of space manifest? Presumably, but it could, in a way, resemble our universe if any particular dimension set dominates.
Much of the basis for forcing ten or eleven dimensions, whether you discuss string theory or M-theory, is the requirement that multidimensional manipulations of geometric figures use an eight-dimensional set of numbers termed octonion. This is part of a series of dimensional number sets that goes, by strict rules, in the sequence 1-2-4-8. Sixteen would be a logical accommodation for this at a higher level.
So why would we perceive only three dimensions of space, out of four, and one dimension of time, out of four? Part of the answer to that is that we, in a way, already perceive more than one dimension of time, and we see it in various physics equations. The broader answer is that each universe can enjoy its particular set of dimensional manifestations, and perhaps another universe might manifest differently.