**Journal of High Energy Physics, Gravitation and Cosmology**

Vol.03 No.02(2017), Article ID:75507,11 pages

10.4236/jhepgc.2017.32024

Extra Dimensions, Brane Worlds, and the Vanishing of Axion Contributions to Inflation

Andrew Walcott Beckwith^{ }

Physics Department, College of Physics, Chongqing University Huxi Campus, Chongqing, China

Copyright © 2017 by author and Scientific Research Publishing Inc.

This work is licensed under the Creative Commons Attribution International License (CC BY 4.0).

http://creativecommons.org/licenses/by/4.0/

Received: February 17, 2017; Accepted: April 17, 2017; Published: April 20, 2017

ABSTRACT

We examine from first principles the implications of the 5^{th} Randall Sundrum Brane world dimension in terms of setting initial conditions for chaotic inflationary physics. Our model pre-supposes that the inflationary potential pioneered by Guth is equivalent in magnitude in its initial inflationary state to the effective potential presented in the Randall-Sundrum model. We also consider an axion contribution to chaotic inflation (which may have a temperature dependence) which partly fades out up to the point of chaotic inflation being matched to a Randall-Sundrum effective potential. If we reject an explicit axion mass drop off to infinitesimal values at high temperatures, we may use the Bogomolnyi inequality to re-scale and re-set initial conditions for the chaotic inflationary potential. One of the potential systems embedded in the Randall-Sundrum brane world is a model with a phase transition bridge from a tilted washboard potential to the chaotic inflationary model pioneered by Guth which is congruent with the slow roll criteria. If, as written up earlier, the axion wall contribution is due to di-quarks, which is equivalent to tying in baryogenesis to the formation of chaotic inflation initial conditions, with the Randall-Sundrum brane world effective potential delineating the end of the dominant role of di-quarks, and the beginning of inflation.

**Keywords:**

Extra Dimensions, Brane Worlds, Axion Contributions

1. Introduction

This investigation is attempting to show that the fifth dimension postulated by Randall-Sundrum theory helps give us an action integral which leads to a minimum physical potential we can use to good effect in determining initial conditions for the onset of inflation. The 5^{th} dimension of the Randall-Sundrum brane world is of the genre, for

(1)

This leads to an additional embedding structure for typical GR fields, assuming as one may write up a scalar potential “field” with real valued, and the rest of it complex valued as [1]

(2)

This scalar field makes its way to an action integral structure which will be discussed later on, which Sundrum used to forming an effective potential. Our claim in this analysis can also be used as a way of either embedding a Bogomolyni inequality, perhaps up to five dimensions [2] or a straight forward reduction in axion mass due to a rise in temperature [3] helping reduce effective potential in this structure, with the magnitude of the Sundrum potential forming an initial condition for the second potential of the following phase transition. Note that we are referring to a different form of the scalar potential, which we will call, which has the following dynamic [4] .

(3)

The potentials, and were described in terms of S-S’ di-quark pairs nucleating and then contributing to a chaotic inflationary scalar potential system. Here,

(3a)

(3b)

We should keep in mind that in Equation (3a) is an equilibrium value of a true vacuum minimum of Equation (3a) after tunneling. In the potential system given as E Equation (3a) we see a steadily rising scalar field value which is consistent with the physics of Equation (3a) and Equation (3b) which qualitatively adhere to what we want for Equation (3). In the potential system given by Equation (3b) we see a reduction of the “height of a scalar field which is consistent with the chaotic inflationary potential overshoot phenomena”. We should note that in Equation (3a) is a measure of the onset of quantum fluctuations. Appendix I is a discussion of Axion potentials which we claim that is part of the contribution of the potential given in Equation (3a). Note that the tilt to the potential given in Equation (3a) is due to a quantum fluctuation. As explained by Guth for quadratic potentials [5] ,

(3c)

This in the context of the fluctuations having an upper bound of ^{ }

(3d)

Here,. Also, the fluctuations Guth had in mind were modeled via [6] ^{ }

(3e)

In the potential system given by Equation (3b) we see a reduction of the “height” or magnitude of a scalar field which is consistent with the chaotic inflationary potential overshoot phenomena mentioned just above. This leads us to use the Randal-Sundrum effective potential [1] in tandem with tying in baryogenesis [7] to the formation of chaotic inflation initial conditions for Equation (3b), with the Randall-Sundrum brane world effective potential delineating the end of the dominant role of di-quarks, due to baryogenesis, and the beginning of inflation. The role of the Bogomolnyi inequality is to introduce, from a topological domain wall standpoint, a mechanism for the introduction of baryogenesis in early universe models. The combination of that analysis, plus matching conditions with the Randal-Sundrum effective potential, sets us up for chaotic inflation.

2. How to Form the Randall-Sundrum Effective Potential

The consequences of the fifth dimension mentioned in Equation (1) above show up in a simple warped compactification involving two branes, i.e. a Planck world brane, and an IR brane. This construction with the physics of this 5 dimensional system allow for solving the hierarchy problem of particle physics, and in addition permits us to investigate the following five dimensional action integral [1] .^{ }

(4)

This integral, will lead to the following equation to solve

(5)

Here, what is called can be linked to Kalusa Klein “excitations” [1] via (for n > 0)

(6)

This uses [8] (assuming is the curvature radius of AdS_{5})

(6a)

This is for a compactification scale, for, and after an ansatz of the following is used:

(7)

We then obtain after a non trivial vacuum averaging [8]

(8)

(9)

This is leading to an initial formulation of

(10)

Now, if one is looking at an addition of a 2^{nd} scalar term of opposite sign, but of equal magnitude [1] ^{ }

(11)

This is for when we set up an effective Randall-Sundrum potential looking like [1] ^{ }

(12)

This above system has a Meta stable vacuum for a given special value of We will from now on use this as a ‘minimum’ to compare a similar action integral for the potential system given by Equation (3) above.

3. How to Compare the Randall-Sundrum Effective Potential Minimum with an Effective Potential Minimum Involving the Potential of Equation (3) above

We are forced to consider two possible routes to the collapse of a complex potential system to the chaotic inflationary model promoted by Guth [5] .

The first such model involves a simple reduction of the axion wall potential [9] as given by, especially when N = 1

(13)

The simplest way to deal with Equation (13) is to set, when Kolb [9] , writes

(14)

i.e. to declare that the axion “mass” vanishes, and to let this drop off in value give a simple truncated version of chaotic inflationary potentials along the lines given by a transition from Equation (3a) to Equation (3b) We should note that is the enormous value of the cosmological constant which is larger than what it is observed to be today [10] [11] [12] , and for now we are side steeping the question of if or not the negative valued Randall-Sundrum cosmological constant [8]

(15)

has a bearing on this situation. Not to mention the problems inherent in several proposed fixes to the cosmological constant problem [13] .

Now if we want an equivalent explanation, which may involve baryogenesis, we need to look at the component behavior of each of the terms in Equation (13) without assuming. Then, we need to re define several of the variables presented above. Now, in the typical theory presented by

(16)

We then have to present a varying in magnitude value for the ‘scalar’ involving ultimately the Bogolmolnyi inequality. I have done several of these for condensed matter current problems, but for our cosmology situation, we first have to work with

(17)

There has been credible work with instantons in higher dimensions, starting with Hawkings 1999 article [14] this, however, addresses a way of linking an instanton structure with baryogenesis, dark energy, and issues of how Randall-Sundrum brane structure can be used to formation of initial conditions of inflationary cosmology.

Clarifying what can be done with an instanton style quantum nucleation in multiple dimensions [15] may help us with more acceptable models [7] [16] as to estimating, roughly, a quantum value for the cosmological constant, as an improvement in recent calculations.

(18)

(18a)

where

(18b)

This leads, if done correctly to the quadratic sort of potential contribution as given by [16] . At the same time it raises the question of if or not when there is a change from the 1^{st} to the 2^{nd} potential system, we have a consistent model. Let us now view a toy problem involving use of a S-S’ pair which we may write as [17]

(19)

This is for a di-quark pair along the lines given when looking at the first potential system, which is a takeoff upon Zhitinisky’s color super conductor model [18] .

4. Comparison of Initial Conditions for a Nucleating Universe

Now for the question the paper is raising, Can we realistically state the following for initial conditions of a nucleating universe? If so, then what are the consequences?

(20)

The right hand side of Equation (20) can be stated as having

. (21)

We can insist that this between a false and a true vacuum minimum [19] , that

(22)

So, this leads to the following question. Does a reduction of axion wall mass for the first potential system given in Equation (3a) being transformed to Equation (3b) above give us consistent physics, due to temperature dependence in axion “mass”, or should we instead look at what can be done with S-S’ instanton physics and the Bogolmyi inequality [20] in order to perhaps take into account Baryogenesis? Also, can this shed light upon the Wheeler De Witt’s equations [21] modification by Ashtekar [22] in early universe quantum bounce conditions?

Finally, does this process of baryogenesis, if it occurs lend then to the regime where there is a bridge between classical applications of the Wheeler De Witt equation to the quantum bounce condition raised by Ashtekar [22] ?

5. Tie in with the Wheeler De-Witt Equation

Abbay Ashtekar’s quantum bounce [22] gives a discretized version of the Wheeler De Witt equation. Let us first review classical De Witt theory which ties in with inflationary n = 2 scalar potential field cosmology. This will be useful in analyzing consequences of the wave functional so formed in Equation (18) and suggest quantum bounce analogies we will comment upon later.

In the common versions of Wheeler De Witt theory a potential system using a scale radius, with as a classical turning point value [21]

(23)

Here we have that

(23a)

As well as

(24)

Now, Alfredo B. Henriques [16] presents a way in which one can obtain a Wheeler De Witt equation based upon

(25)

Using a momentum operator as give by

(26)

This is assuming a real scalar field as well as a ‘scalar mass ‘’ based upon a derivation originally given by Thieumann [23] . The above equation as given by Thiemann, and secondarily by Henriques [16] lead directly to considering the real scalar field as leading to a prototype wave functional for the potential as given by

(27)

As well as an energy term

(27a)

(27b)

This is for a “cosmic” Schrodinger equation as given by

(27c)

This has

(27d)

and

(27e)

Here is the eigenvalue of a so called volume operator [16] and the interested readers are urged to consult with the cited paper to go into the details of this, while at the time noting is for Planck mass, and is for Planck length, and keep in mind that the main point made above, is that a potential operator based upon a quadratic term leads to a Gaussian wave functional with an exponential similarly dependent upon a quadratic exponent. We do approximate solitons via the evolution of Equation (27) and Equation (27c) above, and so how we reconcile higher order potential terms in this approximation of wave functional is extremely important.

Now Ashtekar in his longer arXIV article [24] make reference to a revision of this momentum operation along the lines of basis vectors by

(28)

With the advent of this re definition of momentum we are seeing what Ashtekar works with as a sympletic structure with a revision of the differential equation assumed in Wheeler-De Witt theory to a form characterized by [26] ^{ }

(28a)

In this situation is such that

(28b)

Also, and more importantly this is a difference operator, allowing for a treatment of the scalar field as an “emergent time”, or “internal time” so that one can set up a wave functional built about a Gaussian wave functional defined via

(28c)

This is for a crucial “momentum” value

(28d)

And

(29)

which leads to, for an initial point in “trajectory space” given by the following relation (initial degrees of freedom [dimensionless number] ~ eigenvalue of “momentum”, initial “emergent time”).

So that if we consider eignfunctions of the De Witt (difference) operator, as contributing toward

(30a)

With each an eignfunction of Equation (12a) above, with eigenvalues of Equation (12a) above given by, we have a potentially numerically treatable early universe wave functional data set which can be written as

(30b)

This equation above has a “symmetry” as seen in Figure 1 of Ashtekar’s PRL article [6] about, reflecting upon a quantum bounce for a pre ceding universe prior to the “big bang” contracting to the singularity and a “rebirth” as seen by a different branch of Equation (30b) emerging for a “growing” set of values of.

6. Conclusion

We are presenting a question which may be of relevance to JDEM research. Namely if Ashtekar is correct in his quantum geometry [24] , and the breakdown of early universe conditions not permits the typical application of the Wheeler De Witt equation, then what do we have to verify it experimentally? The axion wall dependence so indicated above may provide an answer to that, and may be experimentally measurable via Kadotas pixel reconstructive scheme [25] .

Furthermore, we also argue that the semi-classical analysis of the initial potential system as given by Equation (3) above and its subsequent collapse is de facto evidence for a phase transition to conditions allowing for dark energy to be created at the beginning of inflationary cosmology [26] [27] . This builds upon an earlier paper done by Kolb in minimum conditions for reconstructing scalar potentials [28] [29] [30] . It also will necessitate reviewing other recent derivation bound to the cosmological constant in cosmology model in a more sophisticated manner than that has been presently done [31] . In doing so, it may be appropriate to try to reconcile A. Ashtekar’s approach involving a discretization of the Wheeler De Witt equation with the bounce calculations in general cosmology pioneered by Hackworth and Weinberg [32] . Needless to say, the work so presented above leaves open the question if or not baryogenesis, is involved in involving a collapse of the first term of Equation (3a) along the lines of the Bogomolnyi inequality, or else we have to skip this and to adhere to the topological defect models pioneered by Trodden, et al. [33] [34] [35] .

Acknowledgements

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

Cite this paper

Beckwith, A.W. (2017) Extra Dimensions, Brane Worlds, and the Vanishing of Axion Contributions to Inflation. Journal of High Energy Physics, Gravitation and Cosmology, 3, 285-295. https://doi.org/10.4236/jhepgc.2017.32024

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Appendix I

Forming an axion potential term as part of the contribution to Equation 2A

Kolb’s book [9] has a discussion of an Axion potential given in his Equation (10.27)

(1)

Here, he has the mass of the Axion potential as given by as well as a discussion of symmetry breaking which occurs with a temperature. Furthermore, he states that the Axion goes to a massless regime for high temperatures, and becomes massive as the temperature drops. Due to the fact that Axions were cited by Zhitinisky in his QCD ball formation [18] this is worth considering, and I claim that this potential is part of Equation (6a) with the added term giving a tilt to this potential system, due to the role quantum fluctuations play in inflation. Here, N > 1 leads to tipping of the wine bottle potential, and N degenerate CP-conserving minimal values. The interested reader is urged to consult section 10.3 of Kolb’s early universe book for additional details [9] .

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