(more from Zanelli)
String Theory Cosmology and the BIVERSE
In General Relativity gravitational collapse
For a mass above the Schwarzchild mass limit
Results in a prediction of
The creation of a singularity,
A point of infinite mass density.
However, I think it fair to say
That most Physicists, Cosmologists, etc.,
Regard this prediction
As a failure of General relativity
Rather than a physical reality.
In fact, cosmological models invoke
Various Instanton structures
Near or at the Planck scale
Where time is wick rotated
To produce a smooth curve,
Rather than a singular point.
For closed Universes Cosmologies
This gives us a well behaved solution.
However, various forms of singular points
Persist for open Universe Cosmologies,
Though milder than the classical GR singularity.
However, in this post, the question of open
Or closed Universes will be quite beside the point.
It is well known that in Loop Quantum Gravity
Space time singularities are impossible
For the same reason we don't see
The ultraviolet divergence in Black Bodies
That is the parameters of interest,
In this case space and time, are quantified.
In addition, LQG predicts a bounce
Under extreme contraction,
Resulting in the foliation of a new Universe.
As we shall see, the same basic prediction
Emerges from M-Theory/ String theory.
In this post we will look at, in very broad terms,
A proposal by M. Gasperini and G. Veneziano
Which makes this prediction.
We shall also explore the possible implications
Of this based on the expanded particle states
Predicted by Bob Klauber, myself and others.
The proposal put forward by Gasperini and Veneziano
Is based on the principle of Scale Factor Duality
Which is a basic reformulation of T Duality,
A symmetry useful in unifying
Various versions of String Theory.
Scale factor Duality was first proposed by Veneziano,
Who expanded on the work of Robert Brandenberger
And Cumrun Vafa on the cosmological implications of T Duality.
An important parameter in String Theory
Is the String scale parameter, known as alphaprime.
This is so named because the Scalar field,
The Dilaton, ( Graviscalar) that sets this scale
Is coupled to the Electromagnetic field,
Which sets the basic string scale.
So in terms of the Planck scale we have;
G*M_plk^2*alpha/(hbar*c)= G*M_str^2/(hbar*c)
M_str= M_plk*sqrt[alpha]= approx M_plk/ 11.7
L_stg= approx 11.7*L_plk = sqrt[alphaprime]
In string theory there are two
Fundamental oscillation modes for strings,
Vibration mode where the string exists unbound in space
And winding modes where the Strin
Is wound around the compact dimension.
However, in actuality these string modes
Are dual to each other.
This removes the distinction between
Compact Dimension and large Dimension.
The energy of this string modes are given by;
E_vib= N/R & E_w= N* R/Alphaprime.
Therefore in one regime
(I will expand on what regime means in due time)
We have;
a= hbar*c*Alphaprime/2*R' + hbar*c*R/2 = 1/R +R
And in the Dual regime
a'= hbar*c*R'/2 + hbar*c*alphaprime/2*R = R +1/R
Although T Duality is usually described
In terms of cylindrical spaces,
Which one dimension is finite,
A variant of it applies
To our ordinary three dimensions,
As demonstrated by Veneziano.
One must be careful about talking about
The expansion of an infinite space.
Its overall size cannot change,
It remains infinite,
But it can still expand in the sense
That bodies imbedded within it
Move away from each other.
The crucial variable in the well know scale factor.
Based on T Duality,
Universes with large scale factors
Are equivalent to Universe with small scale factors.
For years String theorists thought that T duality
Only applied to closed strings
As opposed to open strings.
But as Demonstrated by Polchinsky,
T duality applies to Open Strings,
Based on the Dirchlet Boundary
Condition of Membranes.
In M Theory Open Strings have their end points
(where their charges reside)
On special Branes call D-Branes.
In effect, open Strings
Are completely dual to closed strings.
One observer’s open string
Is another observer’s closed string.
(Of course Strings can't really be observed)
Veneziano realized that this allowed
The generalization of T Duality
Into scale factor Duality.
Therefore we can write;
a= hbar*c*R'/2
a'= hbar*c*alphaprime/2*R
The special insight of Gasperini and Veneziano
Was that these equations described
The relationship of cosmic time
To the scale factor.
As in well known in String theory
A contracting space for a vibration mode string
Is an expanding mode for a winding string.
And given the perfect duality
Of these string modes,
These equations were in fact describing
Two time reversed Universes.
Therefore the following transforms became true,
Based on String theory;
T*a to 1/a'
T*a(t) = a'(-t)
This means that Dual to every contraction
To an apparent Singularity exists
A new expanding Universe,
Foliating its own space time.
And likewise,
Dual to the expansion
Of our own Universe
Is a contracting Universe.
This would also apply to Black Holes.
Inside an event horizon
We find that space and time swap roles.
The expected Singularity at the center
Of a black hole is really a point in time.
Our own Universe might have been born
In the interior of a black hole.
However, while a bit mind boggling
It must be kept in mind that in
This scenario every Big Bang Expansion
Based on Scale Factor Duality
Must have a twin contracting Universe,
A Universe from its past.
What else can we say about the relationship
Of these dual time reversed Universes?
To answer this question we will see how
The expanded particle states mentioned earlier
Might relate to this question.
While not generally acknowledged
In most QFT text books,
The relativistic, Klein-Gordon,
The Proca, the Dirac and the Dirac-like
Spin 3/2 equations have well defined
Negative frequency solutions.
These "extra" solutions,
Hereafter called the Supplemental solutions
(As opposed to the Traditional solutions)
Are generally ignored in QFT.
The reason for this, as pointed out by Pauli,
Is that these solutions cannot relate
To any real physical particle.
A QFT not bound from below is pure nonsense.
However, in recent years,
These "unphysical" solutions have been revived
And applied to the Zero Point Energy problem
And to the possibility of Time Reversed Universes
Created at the Big Bang.
Sakharov, Linde, Klauber, Moffat,
Sundrum and Randel, T'Hooft,
Myself as well as others
Have proposed various models
Which attempt to incorporate
These extra solutions,
While still keeping QFT
Safely bound from below.
It is beyond the scope of this post
To go into detail on this.
This topic has been well covered
In previous posts.
Of course it is far from certain
That any of these efforts
Make a convincing argument.
Nevertheless, we shall proceed
And see how these supplemental solutions
Possibly relate to the Gasperini-Veneziano proposal.
For simplicity I write the Scalar Field equation in natural units.
(&_mu&^mu+mu^2)*phi=0
Where & means partial derivative.
From this is trivial to see that we have the solutions;
psi= exp[-i*(w*t-k*x)
psi= exp[ i*(w*t-k*x)
However, in addition we have another set of solutions.
psi=exp[-i*(w*t +k*x)
psi= exp[i*(w*t+k*x)
Note while these don't appear covariant
A different sign conventions reveals that they in fact are.
We can write this expanded particle state in a very beautiful symmetry.
c=1
t_0=1
E=gamma*m
p=gamma*m*v
gamma= E/m
tau=t/gamma
t=m/E
v= P/E
S=v*t
Traditional States
*********************************
+S +T Quadrant
MATTER w(+) & k(+) (Positive Energy into Future)
t (+)= m(+)/E(+)
v (+)=P(+)/E(+)
gamma (+) = E(+)/m(+)
E (+) = gamma (+)*m (+)
p (+) =gamma(+)*m(+)*v(+)
S(+)=v(+)*t(+)
**************************************************
-S -T Quadrant
ANTI MATTER w (-) k (-) (Negative energy into past)
t(-)= m(+)/E(-)
v (+)=P(-)/E(-)
gamma (-) = E(-)/m(+)
E (-) = gamma (-)*m (+)
p (-) =gamma(-)*m(+)*v(+)
S(-) = v(+)*t(-)
SUPPLEMENTAL STATES
************************************************** ********
-S +T Quadrant
NEGATIVE MATTER w (-) k (+) (Negative Energy into future)
t (+)= m (-)/E (-)
v (-)=P(+))/E(-)
gamma (+) = E(-)/m(-)
E (-) = gamma (+)*m (-)
p (+) =gamma(+)*m(-)*v(-)
S (-) = v (-)*t (+)
**********************************************
+S -T Quadrant
NEGATIVE ANTI MATTER w (+) k (-) (Positive energy into past)
t (-) = m(-)/E(+)
v (-)=P(-)/E(+)
gamma (-) = E(+)/m(-)
E (+) = gamma (-)*m (-)
p (-) =gamma(-)*m(-)*v(-)
S (+) =v (-)*t (-)
**************************************
In essence we describe these four particle state
In terms of energy flow through time.
So we have;
Matter { +E +t}
Antimatter { -E -t} Reinterpreted to {+E +t } all charges reversed
Negative Matter {- E + t}
Negative antimatter {+E -t} Reinterpreted {-E +t }
From this it should be obvious
Why Anti Matter Particles are physical
And the supplemental particles are not.
(to be con't)


LinkBack URL
About LinkBacks

Reply With Quote



