How Does a Setting of the Vacuum Energy Density, as Given Today, Lead to an Initial Hubble Radius for the Early Universe, i.e. How Does the Early Universe Partly Mimic a Black Hole? ()

Andrew Walcott Beckwith^{}

Physics Department, Chongqing University, Huxi Campus, Chongqing, China.

**DOI: **10.4236/jhepgc.2018.42022
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Physics Department, Chongqing University, Huxi Campus, Chongqing, China.

First we review what was done by Klauber, in his quantum field theory calculation of the Vacuum energy density, and in doing so, use, instead of Planck Mass, which has 1019 GeV, which leads to an answer 10122 times too large, a cut-off value of instead, a number, N, of gravitons, times graviton mass (assumed to be about 10°43 GeV) to get a number, N, count of about 1031 if the vacuum energy is to avoid an overshoot of 10122, and instead have a vacuum energy 10°47 GeV4. Afterwards, we use the results of Mueller and Lousto, to compare the number N, of 1031, assumed to be entropy using Ng’s infinite quantum statistics, to the ratio of the square of (the Hubble (observational) radius over a calculated grid size which we call a), here, a ~ a minimum time step we call delta t, times, the speed of light. Now in doing so, we use a root finder procedure to obtain where we use an inflaton value due to use of a scale factor if we furthermore use as the variation of the time component of the metric tensor in Pre-Planckian Space-time up to the Planckian space-time initial values.

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Beckwith, A. (2018) How Does a Setting of the Vacuum Energy Density, as Given Today, Lead to an Initial Hubble Radius for the Early Universe, i.e. How Does the Early Universe Partly Mimic a Black Hole?. *Journal of High Energy Physics, Gravitation and Cosmology*, **4**, 354-360. doi: 10.4236/jhepgc.2018.42022.

1. Framing the Initial Inquiry

We will reference what was doing by Klauber [1] as far as a vacuum energy density, in his textbook, while replacing the cut-off value he used, that of the Planck Mass, he assumed, with that of the entropy of initial concentration of gravitons, with the presumed mass of a graviton, 10^{−}^{43} GeV, in order to come up with a count value of 10^{31} for gravitons. Furthermore, if we then next go to Muller and Lousto’s entangled entropy [2] , we get the 31 times the square of (Event horizon radius/grid size) whereas what we will do is to equate the number, N, of about 10^{31} with the Muller and Lousto’s entropy result, in order to calculate the initial event horizon radius, which we find has a value of about 10^{−}^{20} meters. Small enough, according to the comparative calculations, and this depends upon the presumed grid size having a value of a ~ c times Dt. Here we will reference [3] for how Dt is calculated, whereas we will also state that the value of Dt is less than or equal to Planck time, [4] , which is of the order of 5.39 times 10^{44} seconds.

The summary result is that we get a set of conditions for a cosmological version of the event horizon, which is equivalent to stating that the early universe, has some qualitative similarities to a black hole, initially.

In doing this, we are assuming that the entropy as calculated by [2] is in correspondence to the Ng count of entropy given in [5] which has S(initial) ~ N, so in this case we have the number of gravitons, as so calculated being the same as entropy

Finally, after establishing that, we reference a modified version of Hawkings power spectrum for black holes given in Calmert, Car and Winstanley, [6] which is the mechanism of how there is initially a start of leakage through what we claim is a causal barrier, which is a way of having information preservation of Phank’s constant, from a prior universe, to today’s universe. This means crossing the causal barrier given in [3] so as to preserve information so as to have the same physical law, from cycle to cycle.

In applying [6] we should be alert as to that the expression for dE/dt as given, will be having a black body behavior for what is called the absorption cross section, so this absorption cross section is equal to the area of the initial sphere of space-time. In this case we will be looking at the surface area of a bubble of space-time. So this will be markedly different than the black hole case. Otherwise though, much of the construction will be similar.

So, then we will start our inquiry, and to do so, we have the formation of Dt so as to create the grid value, a, which is in the Muller and Lousto definition of entropy, but notice that we will start the idea of entropy, via an arrow of time argument, [7] , i.e. that [2] [5] , and [7] will be starting points with equivalent definitions of entropy.

2. Examination of the Minimum Time Step, in Pre-Planckian Space-Time as a Root of a Polynomial Equation

We initiate our work, citing [3] to the effect that we have a polynomial equation for the formation of a root finding procedure for Dt, we can, as we did in [3] do the following. Here this straight from [3] . Copied verbatim, and it will be linked to the Muller and Lousto result [2] , in the next section afterwards, and then we will right afterwards use [1] for calculating the vacuum energy, with the results of [2] and [3] used so as to explain the significance of what we come up with in our re do of the calculation in [1] with the difference that instead of using the Plank mass in the Vaccum energy calculation, we use N times the mass of a graviton. In doing so we obtain N ~ 10^{31}, and if this is a measure of entropy, as by [5] we will then have a way to link the N of our re done [1] calculation with the Muller and Lousto entangled entropy of [2] . Note that we are below coming up with a precursor of grid size, as in the Muller and Lousto result, [2] which is then compared to how we look at our re do of Equation (1) i.e. through the device of determining a specific grid size, a.

So let us now begin to look at the step size for time step, as to get the grid size for [2] first.

$\begin{array}{l}\Delta t\cdot \left|\left(\sqrt{\frac{8\text{\pi}G{V}_{0}}{\gamma \cdot \left(3\gamma -1\right)}}\cdot \Delta t-1\right)-\frac{{\left(\sqrt{\frac{8\text{\pi}G{V}_{0}}{\gamma \cdot \left(3\gamma -1\right)}}\cdot \Delta t-1\right)}^{2}}{2}+\frac{{\left(\sqrt{\frac{8\text{\pi}G{V}_{0}}{\gamma \cdot \left(3\gamma -1\right)}}\cdot \Delta t-1\right)}^{3}}{3}-\cdots \right|\\ \approx {\left(\sqrt{\frac{\gamma}{\text{\pi}G}}\right)}^{-1}\frac{48\text{\pi}\hslash}{{a}_{\mathrm{min}}^{2}\cdot \Lambda}\end{array}$ (1)

From here, we then cited, in [5] , using [2] a criteria as to formation of entropy, i.e. If L is an invariant cosmological “constant” and if Equation (1) holds, we can use the existence of nonzero initial entropy as the formation point of an arrow of time [7]

${{S}_{\Lambda}|}_{\text{Arrow-of-time}}=\text{\pi}\cdot {\left(\frac{{{R}_{c}|}_{\text{initial}}~c\cdot \Delta t}{{l}_{\text{Planck}}}\right)}^{2}\ne 0$ (2)

This leads to the following, namely in [5] we make our treatment of the existence of causal structure, as given by writing its emergence as contingent upon having

$\left(\frac{{{R}_{c}|}_{\text{initial}}~c\cdot \Delta t}{{l}_{\text{Planck}}}\right)~\vartheta \left(1\right)$ (3)

The rest of this article will be contingent upon making the following assumptions FTR.

In short, our view is that the formation of a minimum time step, if it satisfies Equation (1) is a necessary and sufficient condition for the formation of an arrow of time, at the start of cosmological evolution we have a necessary and sufficient condition for the initiation of an arrow of time. With causal structure, along the lines of Dowker, as in [8] and given more detail by Equation (3) above as inputs into Equations ((1) and (2)) i.e. Planck length is set equal to 1 and by [3]

$\begin{array}{l}{\frac{\Delta E\Delta t}{\text{Volume}}~\left[\hslash /\text{Volume}\cdot \left(\delta {g}_{tt}~{a}_{\mathrm{min}}^{2}\cdot {\varphi}_{\text{initial}}\right)\right]|}_{\text{Pre-Planckian}}\\ \underset{\left(\text{Pre-Planckian}\right)\to \left(\text{Planckian}\right)}{\to}{\Delta E\Delta t~\hslash |}_{\text{Planckian}}\end{array}$ (4)

i.e. the regime of where we have the initiation of causal structure, if allowed would be contingent upon the behavior of [2]

$\begin{array}{l}{g}_{tt}~\delta {g}_{tt}\approx {a}_{\mathrm{min}}^{2}{\varphi}_{\text{initial}}\ll 1\\ \underset{\text{Pre-Planck}\to \text{Planck}}{\to}\delta {g}_{tt}\approx {a}_{\mathrm{min}}^{2}{\varphi}_{\text{Planck}}~1\\ \iff {\left(\frac{{{R}_{c}|}_{\text{initial}}~c\cdot \Delta t}{{l}_{\text{Planck}}}\right)~\vartheta \left(1\right)|}_{\text{Planck}}\end{array}$ (5)

These conditions are enough to have our creating of Dt, which is part of how we will come up, with the grid, for the Muller and Lousto calculation of entanglement entropy [2] i.e. we set the grid size, here, to

$a~c\cdot \Delta t$ (6)

The equivalence of Equations ((5) and (6)) should be obvious, and we will be using Equation (6) to use [2] ’s result next.

3. Examining of the Muller and Lousto Entanglement Entropy Result, for Early Universe Cosmology

In short, after a very long set of calculations, their model of entropy comes up with [2] , with ${r}_{H}$ a cosmological event horizon

$\begin{array}{c}S\left(\text{Lousto}\right)~0.31\cdot {\left({r}_{H}/a\right)}^{2}\\ ~0.31\cdot {\left({r}_{H}/c\cdot \Delta t\right)}^{2}\\ ~0.31\cdot {\left({r}_{H}/{l}_{P}\right)}^{2}\end{array}$ (7)

We argue that this entropy, is equivalent to the count, N, of gravitons, in accordance to Ng’s infinite quantum statistics, which will then lead to us adapting the next sections results, as to obtain the number of gravitons, initially.

4. Calcuating the Number of Gravitons, N, Due to a Re Set of the Vacuum Energy Calculation Given by Klaubert

In [1] Klaubert re does the Vacuum energy calculation, using Planck Mass, in order to obtain the following:

$\begin{array}{l}\rho \left(\text{vacuum-energy-density}\right)\\ =\frac{1}{\text{2\pi}}{\displaystyle \underset{0}{\overset{\Delta}{\int}}{k}^{3}\text{d}k}=\frac{{\Delta}^{4}}{8\text{\pi}}\\ \underset{\Delta =\text{planck-mass}}{\to}2.80\times {10}^{74}{\text{GeV}}^{4}\end{array}$ (8)

Our supposition is to make the following change in the above calculation, namely

$\begin{array}{l}\Delta \underset{\text{early-universe}}{\to}N\cdot {m}_{g}\\ \Rightarrow \rho \left(\text{vacuum-energy-density}\right)\\ =\frac{1}{\text{2\pi}}{\displaystyle \underset{0}{\overset{\Delta}{\int}}{k}^{3}\text{d}k}=\frac{{\left(N\cdot {m}_{g}\right)}^{4}}{8\text{\pi}}\\ \underset{\Delta =\text{planck-mass}}{\to}{10}^{-47}{\text{GeV}}^{4}\\ \iff N={10}^{31}\\ \&\text{\hspace{0.17em}}{m}_{g}={10}^{-43}\text{GeV}\end{array}$ (9)

If, the above N, in Equation (9) is the same as entropy, then we can state the following, namely

$\begin{array}{l}N={10}^{31}~0.31\cdot {\left({r}_{H}/{l}_{P}\right)}^{2}\\ \Rightarrow {r}_{H}~{10}^{15}\times {l}_{P}~{10}^{-20}\text{meters}\end{array}$ (10)

5. Consequences of Equation (10)

Here for the satisfying of Equation (10) is contingent upon ${{R}_{c}|}_{\text{initial}}~c\cdot \Delta t$ as of being about Planck Length. Then, we have to deal with inflation. If there are roughly 65 e folds, according to Freeze [9] we have then

${R}_{\text{initial}}\cdot {10}^{27}={R}_{\text{final}}$ (11)

If so, using by [10] , the frequency of a wavelength, smaller than
${r}_{H}~{10}^{15}\times {l}_{P}~{10}^{-20}\text{meters}$ will then be on the order of 10^{20} Hertz, or about 10^{11} GHz, which is then divided by 10^{27}, which would then indicate a frequency of about 10^{−}^{7} Hertz today, which sounds horrendous. But is it clear that the frequency would be of the order of 10^{20} Hertz, initially?

Conceivably, depending upon the production scheme, our estimate of
${r}_{H}~{10}^{15}\times {l}_{P}~{10}^{-20}\text{meters}$ depends upon a very specific treatment of an obtained
${{R}_{c}|}_{\text{initial}}~c\cdot \Delta t$ being of the same value as Planck length, and also of
${r}_{H}~{10}^{15}\times {l}_{P}~{10}^{-20}\text{meters}$ being of the order of 10^{−}^{20}. Also, it depends upon the magnitude of the presumed inflationary expansion i.e. a value of instead of 65 e folds for expansion may instead be 50 e folds of expansion, which would correspondingly dramatically shrink the expansion of the wave function form for gravitational waves.

The only way such questions can be answered, is by experimental inquiry. The above are rough estimates only.

Also the introduction of more analysis from Cosmological Non Linear dynamics, as given in [11] [12] [13] [14] may significantly alter the assumed parameters of our assumptions. Christian Corda, and others have done solid work which may alter what has been presented.

In addition, fidelity, or facts in dispute of the Penrose reference [15] could change the parameter of our assumed problem, greatly again, as well.

The experimental gravity considerations are covered in [16] [17] and [18] , and the idea should be especially in our work to examine if [16] and [18] in terms of gravity are adhered to. As these are LIGO projects, we should be looking to see if what we are doing contravenes or backs, the post Newtonian approximations of physics, so brought up.

Reference [17] is a must to review. In it, Corda reviews GR tests and our document must not contravene these basics.

We hope our document and its spin offs are in congruence with these last 3 references, and will work on the assumption they are synergistic with respect to our inquiry as stated here.

Acknowledgements

This work is supported in part by National Nature Science Foundation of China Grant No. 11375279.

Conflicts of Interest

The authors declare no conflicts of interest.

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