By R.F.J. van Linden
From various points of view a fractal-like universe is described. Unlike in
usual fractals, recurring patterns correlate with the number of dimensions in the observation, i.e., zooming
out and in occurs by adding or removing dimensions rather than changing scale. In this way, the forces of
Nature together with their fermions and bosons are ordered hierarchically through their number of dimensions.
The first sections shows some examples of physical phenomena
that re-appear in spaces with one dimension less or more. The sections describe
1, 2, 3 or 4 dimensional worlds that are closed in the next higher dimension. In
section 5, this will be put in a broader context,
covering all of Nature's forces and particles.
1. Closed universes in n dimensions
The descriptions that follow all take a closed universe as a starting point, i.e., if you would travel long enough in one direction, you would eventually return to the point where your journey started. That concept will be explained beginning with a simple 1D world.
Imagine some point-shaped being living on a circle. His limited 1D vision makes
the circle appear to him as a straight line because to actually see the curvature of
the circle he would need to have 2D vision.
Also for our own 3D world, closed in the 4th dimension, this means
that there should be "linked", points, lines or surfaces. A potential
example regarding linked surfaces in particular will be given later in this text.
2. Closed 4D worlds: Black holes and gravity
It is here assumed that massive objects, specifically black holes, and their gravity field represent the 4D world. The fourth dimension is proper time (following Euclidean relativity concepts ) while it is closed in a 5th dimension.
When nearing a black hole these dimensions will show increasing curvature. An
object that falls towards the black hole's Schwarzschild radius follows a
geodesic path along these curved dimensions. An observer at infinity, using a
flat 5D coordinate system will observe that the velocity vector of the falling
object will be subject to a 3-dimensional rotation.
An observer, using a flat 3D coordinate system, will observe this as an initial acceleration in space that will eventually decelerate again until the particle fully stops when it reaches the Schwarzschild radius. It finally has zero velocity in both space and (proper) time like predicted in general relativity, and seems to stay forever at the Schwarzschild radius.
The graph below shows the three different speed components of such an object that falls radially to a black hole from infinity with zero starting velocity in space. The speed components are expressed as a function of the radial coordinate distance r in a flat 5D coordinate system as used by an observer at infinity:
3. Curvature in a closed universe
The example above shows that, even in a flat 3D coordinate system, an observer at infinity is still indirectly able to perceive the curvature of space-time in the neighborhood of the black hole because he observes the acceleration of the falling object.
That curvature is given in classical general relativity as the ratio between infinitesimal coordinate distance dR and radial distance dr :
The ratio becomes 1 at infinity, where curvature of space is assumed to be zero as a a result of the absence of mass.
But if the 4D space-time of our universe is closed in the 5th dimension, curvature on a cosmological scale
must exists everywhere, even with a total absence of mass, and at infinity
dR/dr will not be equal to 1 (the classical formula would
need an extra component to account for this).
Near a massive object (for the Flatlander that is the center of the horn torus) the curvature deviates from 1 (dR/dr >1) according to the Flatlander who uses his observation point with dR/dr=1 (i.e., zero curvature) as a reference. But it will also deviate from 1 when observing deep space (where dR/dr <1).
Consequently, the velocity vector of an object in that far distance will show components in space and the 5th dimension, similar to the situation where it is nearing a black hole. After all, the object will only appear to be at rest relative to an observer at those places where dR/dr =1. Its observed spatial speed goes up both when dR/dr <1 and dR/dr >1.
Universe with accelerated expansion
The inside of black holes
It means that whatever falls into a black hole will appear again instantly at the edge of the universe. It defines the edge of the universe as a gigantic "white hole" which should therefore radiate energy (cosmic background radiation?). The universe then resembles a 5D, multi-hole torus, or n-torus.
|4D velocity vector and speed components of a photon being absorbed by an electrical charge (example)|
In this example, one Coulomb of charge would thus slow down the photon's velocity in space for about 1% at a distance of about 10-5m. So far, no such effect was ever recorded through experiment but putting a net charge of one Coulomb in such a tiny volume is a challenge on its own and may very well prohibit an easy setup of such an experiment. The force involved in this example would be in the order of 2x1019 N!
The "spontaneous" emission of a photon by a charge could have its origin in the simultaneous absorption of a photon by another charge, linking charged particles through the 4th dimension in a similar way as the black holes and the edge-of-universe were linked through the 5th dimension. This would implicate an instantaneous transformation of information in 3D, which on its turn brings the EPR experiment to mind where something similar happens with two "linked" photons. The seemingly instantaneous information transfer in this experiment indicates that, again, a higher dimension may be involved in the link and that the two photons might actually be one and the same, looked at from two opposite sides.
What looks like a fermion from "below" (e.g. 3D) looks like a boson from "above" (e.g. 4D).
The meaning of "above" and "below" here depends on the number of spatial dimensions that an observer is able to see. We, humans, can see 3 spatial dimensions so when we look at a 2D world (Flatland) we look at it from "above". On the other hand, when a Flatlander looks at a 3D world (he can of course only see its projection to his 2D world), he looks at it from "below".
The tables below gives an overview of how particles and fields may be observed from various dimensional "levels". When observed as a boson, the particle will follow a path equivalent to a null geodesic for that dimensional level and its speed will be measured as c, otherwise its path is timelike with speed <c.
For a Flatlander
with 2D vision
it looks like a:
For a Spacelander
with 3D vision
it looks like a:
For a Hyperspacelander
with 4D vision
it looks like a:
|Gluon||long range boson||short range boson||short range boson|
|Photon||fermion||long range boson||short range boson|
|Electron||black hole||fermion||long range boson|
|Black hole||universe||black hole||fermion|
When we look at mass particles like e.g. an electron, we see it as the fermion for the electromagnetic field. If we would have been Hyperspacelanders with 4D spatial vision we would always see these electrons move with velocity c in our 4D space and they would behave like bosons (of gravity) . It's like dimensional zooming out, not by changing magnification but by changing the number of dimensions that are observed.
|Force||# dimensions||fermions (# dim)||bosons (# dim -1)|
|Weak nuclear||2 (any subset of 2 out of our 4D space-time) (1)||gluons and ?||W, Z, ?|
|Strong nuclear||3 (any subset of 3 out of our 4D space-time)||photons and quarks (2)||gluons|
|Electromagnetic||3+1 (our 4D space-time)||electrically charged particles||photons|
|Gravity||3+2 (our 4D space-time + a higher dimension)||black holes (3)||massive particles|
(1) : The nuclear forces consist of a 2 or 3 dimensional subset of our 4D space-time. They may however rotate in 4D and thus occupy any of the 4 dimensions at a given moment.
(2) : If the strong nuclear force is indeed the field to be associated with a 3D Euclidean space-time and bosons and fermions are mutually dual between dimensional levels then the bosons of the electromagnetic field must be the dual of the fermions of the strong nuclear field, i.e., a photon might just be another variation of a quark.
(3) : Black holes are actually 5D fermions and are the gravity "charge"
Dimensional zooming out and in
The picture below visualizes the effect that a "downgrade" of spatial vision (dimensional zooming in) would have on the way particles show themselves to an observer with n-dimensional vision.
|"Downgrade" of spatial vision from (n) dimensions to (n-1) dimensions|
Note that the nth spatial dimension does not disappear! It gets fully contracted, curled up if you like , in the lower-dimensional space (hence the massive rollers) and becomes the proper time dimension for the observer with (n-1)-dimensional vision. Also for us, Spacelanders, the proper time dimension is fully contracted into our 3D space, which explains why we can "see" relativistic non-simultaneities in moving objects and also have no problem observing time dilation in moving clocks. But it also says that all bosons in 4D remain visible for us as fermions in 3D. A similar effect takes place in the world of the Flatlander: all photons of our 3D space will still exist as fermions in his 2D space.
The list of fields may continue with fields that have 6 or more dimensions but have so far not been observed. There may also be a 1-dimensional field with hitherto unknown properties. I dare to suggest that even 0-dimensional and negatively-numbered-dimensional fields exist. After all, who are we to say that our familiar 4 dimensions are at the bottom of the list? The fact that we number them 1 - 4 doesn't mean a thing. We could have numbered them 2.356 - 2.359 just as well. If we can't see the fifth dimension why would we be able to see dimension 0 or dimension -12 ?
Imagine now a being that is able to observe dimensions -1, 0, 1 and 2 (so also four in total). For that being, the picture
is complete for his four forces, making our weak nuclear force look like electromagnetism in
the eyes of this "shifted-dimensional" being. Similarly, what we call gravity
may be any other kind of field for another shifted-dimensional being.
So is this all nonsense? Looking at articles on braneworlds, induced matter theories, supersymmetry and so on, these ideas do not seem to be any more exotic whatsoever. The more spiritual minded reader may even recognize in this model ancient descriptions of 'layered' worlds. Perhaps the most interesting contribution of the fractal-universe model based on Euclidean relativity is that quantum gravity results from it naturally. The full quantum description of electromagnetism based on a 4D Euclidean space-time can in principle be ported one-to-one to gravity based on a five dimensional Euclidean space-time with mass particles acting as its bosons.
And what if individual dimensions were created a fraction after each other in climbing order? That process might still be ongoing with the creation of
yet more higher dimensions. Our Big Bang as a snapshot in an ever-lasting Bang that started much earlier already?
|Our own 4D slice (yellow) popping in existence during an ever-lasting
Big Bang, continuously creating new dimensions along the 'stairs'.
 R.F.J. van Linden, "Dimensions in Special Relativity Theory - A Euclidean Interpretation", Galilean Electrodynamics Vol 18 nr 1 (Jan/Feb 2007)
 R.F.J. van Linden, "Minkowski versus Euclidean 4-vectors", available at www.euclideanrelativity.com (Feb 2006)
 Paul Wesson, "In Defense of Campbell's Theorem as a Frame for New Physics", arXiv.org gr-qc/0507107 (July 25th 2005
 Brian Greene, "The elegant universe", W.W. Norton and Company (Feb 1999)
Updated September 17th 2015, © Copyright 2004-2015 R.F.J. van Linden
|Euclidean Relativity||Relativity Simplified||Fractal Universe|