2. Quantum Mechanics
Let the line element
for the ‘four-momentum’
, then,
for
,
and
, where,
for the rest mass
, whereas
is the ‘four-velocity’, then, the rearrangement of (
1) as,
, may yield the representation of a wave field
by superposition of a free particle (de Broglie wave) as,
Thus, from (
2), we can get the (total) energy operator
(it is analogous with but not exactly the same as the classical Quantum Mechanics, since it is now related to
instead of
spacetime due to the presence of
in its wave field), and the three momentum operator
, whereas the ‘Four-momentum’ operator,
and the mass operator,
for
. Let us prescribe quantum-to-classical metric tensor (i.e.,
) for the ‘Four-momentum’ operator
as,
Here, the ‘quantum metric tensor’
is symmetric, i.e.,
, and
. Components of its inverse matrix
are themselves the components of matrix
, namely,
, where,
is the Kronecker delta.
Then,
in (
4) may express as,
But, (
6) immediately tells us that (
1) is possible to write as,
The quantum line element
has neither a Minkowski spacetime, nor a purely Hilbert space and not its metric is Lorentzian, since
is satisfying (
5).
Note that,
since
. Hence, for
and
, (
4) becomes as,
. For constant velocity
and
in the
rhs term of (
4) yields an uncertainty principle describing the intrinsic indeterminacy with which
and
s can be determined by,
The mass-energy relation in (
1), i.e.,
, yields its quantum definition for the mass operator
of (
4) along with (
3) and (
6) as,
The
rhs term of this equation becomes very surprising due to
, because it is not clear to whom
acts upon.
Relating the first line of (
7) to its last line, the quantum line element yields,
or, simply discarding
, we can get,
Then, (
9) may give us the Schrödinger equation in
spacetime for (
8) as,
Again, applying the representation of wave field
of (
2) into
from (
1) and replacing
with
for (
5), we can get,
Thus, (
11) should be used as a general alternation of (
10).
Now, let us check
Quantum Mechanics from the perspective of General theory of Relativity [
2]. Let us consider a space
. Let
is a coordinate system of a point
. Let a line element (
) is,
hence, this yields (
7) as,
where,
, for (
6) and for some value of
(see (
18) below for more details).
Let
is a smooth,
D-dimensional manifold, where
is an
n-dimensional differentiable manifold and
is a metric, which is either as a positive-definite section of the bundle of symmetric (covariant) 2-tensors
or as positive-definite bilinear maps,
for all
. Here,
is the subspace of
generated by elements of the form
. Let
be local coordinates in a neighborhood
U of some point of
M. In
U the vector fields
form a local basis for
and the 1-forms
form a dual basis for
, that is,
. The metric may then be written in local coordinates as
. Let
denote the Levi-Civita connection of the metric
. The Christoffel symbols are the components of the Levi-Civita connection and are defined in
U by
, and for
, we see that they are given by,
Let the curvature
-tensor
is defined by,
Thus, the curvature tensor,
, is purely Quantum Mechanical due to (
12).
Let the tensor
is the trace of
curvature tensor:
, defined by
, and the scalar curvature
is the trace of
tensor:
where
is a unit vector spanning
. Then, the Einstein-like tensor
directly acts on a quantum space. Thus, Einstein-like field equation,
, is now ‘purely’ Quantum Mechanical for (
12). But the Ricci tensor
, thus, Einstein field equation (in quantum spacetime) should become as,
where
g is satisfying (
5), and where
is Einsteinian and not renormalizable, though, in the first line of (
13), mass dimension of gravitational constant vanishes due to
and if divergences are to be present, they could now be disposed of by the technique of renormalization (though, this will not play a role in our present discussion). Hence, (
13) should be used as a renormalizable Einstein field equation in quantum spacetime for general purposes.
3. Extra Eleven Dimensions from Quantum State Spaces
Both of the above perspectives of
Quantum Mechanics yield extra eleven dimensions from its quantum state spaces quite naturally. The wave field
in (
2) must satisfy the eigenfunctions for a discrete Lorentz transformation as,
for
, when
is the complex conjugate of
. Then, using summation convention and (
6), we can write the joint state formalism as,
But, (
15) may also intend to,
for
and
, whereas
implies either
is in company with
or
is in company with
, exclusively, i.e., the ‘wrong’ distribution of indices for
∂ and
. Here,
and
have been chosen arbitrarily. Hence, the complex conjugate of (
16) is,
If we take the line element as,
, where
is an operator, then we can say that,
, though, we may assume without any objection that,
, for some value of
. Thus,
Then, comparing with (
16), if
, we can write that,
This yields,
, if
, which gives the equivalency of (
18) and (
16).
No more combinations are possible from (
16) apart from
,
and (
15) itself. The arrangement of
and
implies that
. Thus, (
16) should be rewritten by considering (
15) and additionally replacing
with
as follows,
Note that,
exclusively has to depend upon spacetime. Comparing (
18) with (
16), let us say that, when
,
Since
as long as
, then, for
, the ‘−’-sign of (
20) must have to switch its position in such a way that,
Reduction of (
19) or (
21) is impossible since both of their
lhs are only depended upon
∂, thus,
The spacetimes of and (so as ) are not easily dissociative even up to a very high energy scale.
Since is independent of , the spacetime of (so as ) must be an internally hidden property of the overall system (in other words, inside the observable spacetime of ). Thus, the observable spacetime is always ∂-dependent.
But, the
rhs of (
21) gives us,
where, the swap operator
for some phase
, whereas
V is a vector space. Then the corresponding eigenspaces are called the symmetric and antisymmetric subspaces and are denoted by the state spaces
and
, respectively. Note that, we have not intended here that
and
individually are two distinguishable particles for the state space
or
; the above equations are just the generalization forms of their kinds, because
and
do not have distinguished (opposite) spins until otherwise they are dissociated as free particles at very high energy scale; so, the observable spin is always the spin of
, since
is an internally hidden property of the overall system and the observable spacetime is always
∂-dependent. Thus, (
21) tells us that, if we allow
to be dissociated as a free particle at very high energy, the internally hidden spacetime of
then must be transformed into a fermionic particle, whereas, the overall
∂-dependent system remains bosonic, since, the observable spacetime is always
∂-dependent.
Similarly, (
17) yields,
which tells us that the internally hidden spacetime of
must be now bosonic, whereas, the overall system is fermionic, since, the observable spacetime is always
∂-dependent. So, whatever (
21) and (
22) want to tell us is that the
∂-dependent overall system has Supersymmetry and since the spacetimes of
and its supersymmetric partner
are not easily dissociative even upto a very high energy scale; thus,
must require extremely high energy to dissociate itself from the overall system as a free particle. Instead of being a free supersymmetric partner,
actually works quite differently inside of the observable spacetime
, though, at the same time,
is still satisfying the properties of Supersymmetry. We will show you
’s actual purpose very soon in the below. But before that, Supersymmetry needs extra dimensions and we have to discuss it now.
Remark (Dark Matter)
. By the way, before we proceed with anything, we can develop a -dependent scenario as follows,
and the complex conjugate of Ψ is,
It is not important which state spaces satisfy such bosonic or fermionic representations of (23) and (24), here, the most important thing is that the overall system as a free observable particle is must not be baryonic matter because now only the internally hidden spacetime of ρ has ‘proper’ distribution of indices for ∂ and ψ resulting its ∂-dependency, whereas, the overall (observable) system is -dependent, i.e., it has ‘wrong’ distribution of indices for ∂ and ψ. Despite of ρ’s ∂-dependency, here, being a supersymmetric partner, if it is allowed to be free at very high energy, it must not be baryonic either and we should not be confused with it. The only candidate to have such properties like (23) and (24) is definitely non-baryonic, hence, it is Dark Matter.
The internally hidden spacetime of
in (
21) and (
22) also provides us some additional geometries for its
structures. Suppose, for
, we have,
, where, both spacetimes have the ‘wrong’ distribution of indices for
∂ and
within the curvey brackets. These ‘wrong’ distributions must have a noticeable effect on the acceptable spacetime, i.e., its temporal part must influence over the spatially depended
, or its spatial part must influence over the temporally depended
, or vice versa. In other words, the acceptable spacetime may not be four-dimensional in this case. Let us check it.
Let,
, when
and
. Suppose, for
, we should consider a dimension function,
Let the space
satisfy a normal
-space. Let
be a collection in an initially
topological spacetime
, i.e.,
, which is actually hidden inside an observable
spacetime,
(be careful about the subscript indices
here – do not confuse observable spacetime with the hidden spacetime, which always carries subscript indices
and
both at the same time).
See [
3,
4,
5,
6,
7] for the required background of Dimension Theory to construct a mapping
f of the spacetime
into a spacetime
S, which is a closed (open) mapping, if the image of every closed (open) set of
is closed (open) in
S. Then the continuous mappings which lower dimensions of the spacetime
should be defined as follows,
Theorem 1.
Let f be a closed continuous mapping of the spacetime onto the spacetime S such that for every . Then,
where for the space K, when , since i should not be zero in (25).
Note that, here and hereafter, the sign ‘≤’ always intends to give meaning to Dimension Theory [
3], rather than its traditional algebraic meaning.
Proof. Using Theorem III.6 of [
3], we can easily prove this theorem. Other good references are [
4,
5,
6,
7]. theorem □
Since, the temporal axis is unaltered in Lorentz transformation, as we have already seen it in (
14), we can express the maximal continuous mapping of the
spacetime
onto the spacetime
S of (
26) as,
since
i should not be zero in (
25), then the spacetime
S definitely intends the basic structure of a 2-dimensional worldsheet
with the joint states,
for the spacetime
, where
S is a
spacetime, i.e., string. Obviously, a string can sweep out the 2-dimensional worldsheet
for the spacetime
. But for the space
K, we need to discuss it in more details, what we are going to do below in Theorem 2.
Before that, since the spacetime of
is hidden inside the overall system of (
21), i.e., in other words, inside the observable spacetime of
, then the increment of spacetime
should not be observable by any means, i.e., the extra dimensions of
remain hidden forever inside the observable spacetime of
. As these internally hidden extra dimensions inside the observable spacetime of
are considered as the representation of the spacetime
S and the space
K, thus, we can conclude,
Strings (i.e., the spacetime S for the hidden spacetime ) are natural and universal but forever hidden inside every observable system, here, it is spacetime , in Quantum Mechanics.
Every
observable system in Quantum Mechanics must contain forever hidden extra dimensions (i.e., the space
K for the hidden spacetime
) independent of any external observer whether she/he considers any string in this system or not (for more details, see (
28) below and its following text therein).
But beyond , the space K can raise more extra hidden dimensions by a closed continuous mapping by adopting the following,
Theorem 2. Let f be a closed continuous mapping of a space R onto a space K such that for each point q of K, contains at most points ; then , when and , where .
Proof. Using Theorem III.7 of [
3], we can easily prove this theorem. Other good references are [
4,
5,
6,
7]. □
Then, we can say for the overall spacetime
that,
hence, for the value of
K,
Note here that stringy spacetime
S vanishes in the overall spacetime
of (
27) for the space
K, leaving behind the forever hidden extra dimensions
m in
. Thus, in other words, strings are experimentally unobservable forever, whereas, their actions should be mandatory in the purpose of overall spacetime
(see end of this section for more details). Also notice that Supersymmetry (now having extra dimensions
m for
due to (
28)) remains unchanged in
of (
27). Thus, with these extra dimensions, the above scenario is now perfect for Supersymmetry and String Theory without any further objections and/or adjustments.
Along with Theorem 1, what (
28) actually wants to say us is,
when
, which yields,
Since
in (
27), let the
lhs of (
29) gives,
The most disturbing thing here is that the temporal axis is a part of
S spacetime but not the part of
K space, but both
and
spaces are influenced by the (mutual) temporal axis, despite the fact that neither of them have contained any temporal axis within themselves. On the other hand, it is evidence that only an influence should not be sufficient to emerge a temporal axis within
M (or
K) space. Moreover, Theorem 2 yields no temporal axis for
M (or
K) space either. But the influenced of the temporal axis should not ease to avoid in (
30).
From Theorem 2, if we think that the dimension of
M space depends only on
, then we should be mistaken,
M is not independent from either elements of the set
. Thinking otherwise, let
are related to new quantities
and
, differently, which are the curvilinear coordinates of
. Let the corresponding members
are determining
, then if each pair of members from the either sides of these curvilinear coordinates joining the pairs of points
and
(
) meet in points
separately, then the three points of intersection
of the pairs of coordinates
and
(
) lie on a line. Let each of the pairs of coordinates
,
(
) consists of two distinct coordinates and in which
. Let the coordinate vectors of
be denoted by
, that of
by
(
) and that of
by
(
). Then
can be represented by a linear combination of the
and
for each
, say,
. Hence,
;
and
. Let us choose two set of coordinates,
for
, such that
,
and
is a basis of
, whereas
, where
is the interior of
and
O is the origin, i.e.,
is admissible for
. Let the quadratic form,
say, is reduced. The last fact means that
, so that
. Since
is admissible for
, the coordinates
(
m an integer) do not belong to
. Thus,
this implies that,
So as,
and we can easily find that
. Here,
Similarly,
In the same way,
In the last line we have used subscripts
, which are quite different from the subscripts
we have been using yet, however, their purposes are quite obvious here. Since, the temporal axis is a part of
S spacetime but not the part of
K space, so both
and
spaces, as well as
and
spaces of (
31), are influenced by the (mutual) temporal axis, though, neither of them have contained any temporal axis within themselves. Then we can say that all axes of
and
(for
) in
K space are interrelated with the (mutual) temporal axis coming from string spacetime
S, since the temporal axis is a part of
but not the part of
K space, thus,
and
(for
) in
K space have individual existences as independent axes
and
(for
) influenced by the (mutual) temporal axis
. Let us assume that each member of
or
(for
) in
K space have maximal weight as 1 for a dimension which is an independent axis for
or
, respectively, which yields,
Hence, they have ‘proper’ dimensions. But, comparing the last line of (
34) with (
32) and (
33), we can determine that if (
32) and (
33) give us some ‘proper’ dimensions, then (
34) definitely gives us some ‘improper’ dimensions, since both
and
are depending on
and
axes, simultaneously. Since
a and
b are satisfying (
31), then
and
(for
,
) must give us ‘improper’ dimensions, too. If we consider these ‘improper’ dimensions
or
(for
,
) in
K space have individual existences as independent axes
or
, respectively, (since they are depending on
and
axes, simultaneously) influenced by the (mutual) temporal axis
, then, on the contrary of (
35), let us assume that they have maximal weight as
of each dimension for
or
, so as they can give
to yield the maximal weight as 1 for a ‘proper’ dimension. Thus, we can say that,
Hence, altogether they have,
Since
, the
K space yields,
i.e.,
Thus,
has the spacetime axes as (using summation convention),
where
, whereas, other maps are obvious, for
,
and
. So, (
36) yields,
where, the dimensions of
K is strongly dependent upon the dimensions of
S, that is why string has eleven-dimensions by nature – as a result, eleven is the maxinium spacetime dimension in which one can formulate a consistent Supergravity theory.