<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE article  PUBLIC "-//NLM//DTD Journal Publishing DTD v3.0 20080202//EN" "http://dtd.nlm.nih.gov/publishing/3.0/journalpublishing3.dtd"><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" dtd-version="3.0" xml:lang="en" article-type="research article"><front><journal-meta><journal-id journal-id-type="publisher-id">JHEPGC</journal-id><journal-title-group><journal-title>Journal of High Energy Physics, Gravitation and Cosmology</journal-title></journal-title-group><issn pub-type="epub">2380-4327</issn><publisher><publisher-name>Scientific Research Publishing</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.4236/jhepgc.2017.33036</article-id><article-id pub-id-type="publisher-id">JHEPGC-78079</article-id><article-categories><subj-group subj-group-type="heading"><subject>Articles</subject></subj-group><subj-group subj-group-type="Discipline-v2"><subject>Physics&amp;Mathematics</subject></subj-group></article-categories><title-group><article-title>
 
 
  Isolating a Minimum Radius of the Universe Consistent with the Production of at Least 1 Unit of Entropy, at the Start of Inflation
 
</article-title></title-group><contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Andrew</surname><given-names>Walcott Beckwith</given-names></name><xref ref-type="aff" rid="aff1"><sub>1</sub></xref><xref ref-type="corresp" rid="cor1"><sup>*</sup></xref></contrib></contrib-group><aff id="aff1"><label>1</label><addr-line>Physics Department, College of Physics, Chongqing University, Chongqing China</addr-line></aff><author-notes><corresp id="cor1">* E-mail:<email>rwill9955b@gmail.com</email></corresp></author-notes><pub-date pub-type="epub"><day>09</day><month>06</month><year>2017</year></pub-date><volume>03</volume><issue>03</issue><fpage>461</fpage><lpage>466</lpage><history><date date-type="received"><day>March</day>	<month>22,</month>	<year>2017</year></date><date date-type="rev-recd"><day>Accepted:</day>	<month>July</month>	<year>28,</year>	</date><date date-type="accepted"><day>July</day>	<month>31,</month>	<year>2017</year></date></history><permissions><copyright-statement>&#169; Copyright  2014 by authors and Scientific Research Publishing Inc. </copyright-statement><copyright-year>2014</copyright-year><license><license-p>This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/</license-p></license></permissions><abstract><p>
 
 
  We begin by examining a general expression of entropy, and its links to a minimum radius of the universe. We derive an expression for the production of at least 1 unit of entropy, which translates to a value of Planck length in radii to 1000 times Planck radii, for the quantum bubble of space-time which depends upon, of all things, the initial Hubble expansion rate value. If the Hubble parameter has the value of 10^19 GeV, we see a minimum radial length of the Universe of about 1 billion times Planck length. If the Hubble parameter is of 10^19 GeV, the minimum radial length of the universe would be about one Planck length, which is surprising to put it mildly. The higher the initial temperate is, up to a point, the more likely the initial entropy is closer to the Causal barrier mentioned in an earlier publication by the author.
 
</p></abstract><kwd-group><kwd>Causal Barrier</kwd><kwd> Inflaton</kwd><kwd> Mininum Entropy (Non Zero)</kwd><kwd> Initial Radii (of Universe)</kwd></kwd-group></article-meta></front><body><sec id="s1"><title>1. Introduction</title><p>We begin with the expression given in [<xref ref-type="bibr" rid="scirp.78079-ref1">1</xref>] [<xref ref-type="bibr" rid="scirp.78079-ref2">2</xref>] [<xref ref-type="bibr" rid="scirp.78079-ref3">3</xref>] , with F the free energy, and S the entropy, so that</p><disp-formula id="scirp.78079-formula283"><label>(1)</label><graphic position="anchor" xlink:href="http://html.scirp.org/file/4-2180207x2.png"  xlink:type="simple"/></disp-formula><p>The end result is that we will approximate the entropy count as given by the last line of Equation (1) so that we can refer to an article in [<xref ref-type="bibr" rid="scirp.78079-ref4">4</xref>] for which there exists a critical Hubble parameter, <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x3.png" xlink:type="simple"/></inline-formula>for which we have by [<xref ref-type="bibr" rid="scirp.78079-ref1">1</xref>] a <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x4.png" xlink:type="simple"/></inline-formula> value that will be shown to have<inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x5.png" xlink:type="simple"/></inline-formula>, with a radius of the universe of about 1000 times Planck length. Also, where if we have instead, <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x6.png" xlink:type="simple"/></inline-formula>, we have <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x7.png" xlink:type="simple"/></inline-formula> with a radius of the Universe of about one Planck length. After this is done, we will then comment upon the value of the square of the average inflaton value given by [<xref ref-type="bibr" rid="scirp.78079-ref5">5</xref>] . Where the square, of the inflaton, is given as follows, with a single inflaton given in Equation (2) as follows:</p><disp-formula id="scirp.78079-formula284"><label>(2)</label><graphic position="anchor" xlink:href="http://html.scirp.org/file/4-2180207x8.png"  xlink:type="simple"/></disp-formula><p>With the substitution of m as the mass of a graviton, as given in [<xref ref-type="bibr" rid="scirp.78079-ref6">6</xref>] , i.e. about 10^-62 grams, the inequality leading to a graviton mass induced behavior of the inflaton which we will comment upon fully while making use of <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x9.png" xlink:type="simple"/></inline-formula> that is discussed in [<xref ref-type="bibr" rid="scirp.78079-ref7">7</xref>] [<xref ref-type="bibr" rid="scirp.78079-ref8">8</xref>] . In doing so, if one wants to be close to a Pre-Planckian length and time step, the preference would use<inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x10.png" xlink:type="simple"/></inline-formula>, which then gets to the issue of interpretation of what to make of the following, from [<xref ref-type="bibr" rid="scirp.78079-ref9">9</xref>] , i.e. if <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x11.png" xlink:type="simple"/></inline-formula> refers to initial degrees of freedom, then we will interpret several different cases for Equation (3) below, with different mass scale ideas in, and different initial temperature scenarios.</p><disp-formula id="scirp.78079-formula285"><label>(3)</label><graphic position="anchor" xlink:href="http://html.scirp.org/file/4-2180207x12.png"  xlink:type="simple"/></disp-formula><p>We will discuss all this and more in the subsequent analysis. Our final points will be using a comment from Rudin, as to outer measures [<xref ref-type="bibr" rid="scirp.78079-ref10">10</xref>] and its relationship to the causal structure brought up in [<xref ref-type="bibr" rid="scirp.78079-ref11">11</xref>] and [<xref ref-type="bibr" rid="scirp.78079-ref12">12</xref>] .</p></sec><sec id="s2"><title>2. The Basic Analysis to Consider</title><p>What we are looking at first of all, is if Equation (1) is true, and Entropy is a counting algorithm, which is not so farfetched, then by use of [<xref ref-type="bibr" rid="scirp.78079-ref4">4</xref>] for entropy, and <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x13.png" xlink:type="simple"/></inline-formula> as well as [<xref ref-type="bibr" rid="scirp.78079-ref3">3</xref>] for <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x14.png" xlink:type="simple"/></inline-formula> (particle count) then</p><disp-formula id="scirp.78079-formula286"><label>(4)</label><graphic position="anchor" xlink:href="http://html.scirp.org/file/4-2180207x15.png"  xlink:type="simple"/></disp-formula><p>Then, we have that</p><disp-formula id="scirp.78079-formula287"><label>(5)</label><graphic position="anchor" xlink:href="http://html.scirp.org/file/4-2180207x16.png"  xlink:type="simple"/></disp-formula><p>We then will pick the smallest possible entropy value of n as equal to 1. Then what we are looking at is</p><disp-formula id="scirp.78079-formula288"><label>(6)</label><graphic position="anchor" xlink:href="http://html.scirp.org/file/4-2180207x17.png"  xlink:type="simple"/></disp-formula><p>We will look at two cases for our analysis, and the first one is with the [<xref ref-type="bibr" rid="scirp.78079-ref5">5</xref>] value of <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x18.png" xlink:type="simple"/></inline-formula></p></sec><sec id="s3"><title>3. What If<inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x19.png" xlink:type="simple"/></inline-formula>? Consequences for Equation (6)</title><p>Here we first normalize the <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x20.png" xlink:type="simple"/></inline-formula> with regards to the Planck Mass. The Planck Mass is [<xref ref-type="bibr" rid="scirp.78079-ref13">13</xref>]</p><disp-formula id="scirp.78079-formula289"><label>(7)</label><graphic position="anchor" xlink:href="http://html.scirp.org/file/4-2180207x21.png"  xlink:type="simple"/></disp-formula><p>We will set c = 1 a, normalize the Planck mass to be = 1. If so then we write</p><disp-formula id="scirp.78079-formula290"><label>(8)</label><graphic position="anchor" xlink:href="http://html.scirp.org/file/4-2180207x22.png"  xlink:type="simple"/></disp-formula><p>If so then, we will have Equation (6) rendered to be</p><disp-formula id="scirp.78079-formula291"><label>(9)</label><graphic position="anchor" xlink:href="http://html.scirp.org/file/4-2180207x23.png"  xlink:type="simple"/></disp-formula><p>By inspection, it means in order to have Equation (6) of the order of magnitude of about 1, or less, we need to look at</p><disp-formula id="scirp.78079-formula292"><label>(10)</label><graphic position="anchor" xlink:href="http://html.scirp.org/file/4-2180207x24.png"  xlink:type="simple"/></disp-formula><p>i.e. <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x25.png" xlink:type="simple"/></inline-formula>would be at least a billion times larger than<inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x25.png" xlink:type="simple"/></inline-formula><inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x26.png" xlink:type="simple"/></inline-formula>, in order to have Planck length of radii of the initial configuration of space time for at least 1 unit of entropy production. With the lower value of <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x25.png" xlink:type="simple"/></inline-formula><inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x26.png" xlink:type="simple"/></inline-formula><inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x27.png" xlink:type="simple"/></inline-formula> as specified in [<xref ref-type="bibr" rid="scirp.78079-ref5">5</xref>] we would have then an initial radii of Planck length times one billion for about 1 unit of entropy production of our analysis.</p></sec><sec id="s4"><title>4. Consequences of <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x28.png" xlink:type="simple"/></inline-formula> Instead of <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x28.png" xlink:type="simple"/></inline-formula><inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x29.png" xlink:type="simple"/></inline-formula></title><p>Going back to the Equation (3) it depends upon what we choose the Mass, in the denominator, to be, of which if it is Planck Mass, and we normalize that to 1, then we have at the boundary of about a Planck length for a 1 entropy value, i.e. one count of a primordial particle, but at an insanely high initial temperature, of the order of Planck temperature of about 1.417 &#215; 10<sup>32</sup> kelvin, or about 1.22 &#215; 10<sup>19</sup> GeV, for the given production of 1 unit of Planck mass. Note that Planck length is about, in simple units set about being 1.616229(38) &#215; 10<sup>−</sup><sup>35</sup> m so this means that the radii of the universe even with</p><disp-formula id="scirp.78079-formula293"><label>(11)</label><graphic position="anchor" xlink:href="http://html.scirp.org/file/4-2180207x30.png"  xlink:type="simple"/></disp-formula></sec><sec id="s5"><title>5. Conclusion: Planck Radii in Length for Initial Configuration of Universe Could Lead to One Unit of Entropy Production. Consequences? Ultra High Temperatures. What Else?</title><p>What we would have to go back to, then would be to review the ideas given in the document about the Dowker Structure of space-time as given in [<xref ref-type="bibr" rid="scirp.78079-ref12">12</xref>] and that would place a premium upon also understanding the role of the formulation of a causal boundary, as given in [<xref ref-type="bibr" rid="scirp.78079-ref11">11</xref>] , where after this boundary, we would employ [<xref ref-type="bibr" rid="scirp.78079-ref11">11</xref>] after an initial radii of space-time, is traversed from an initial starting point given by what is written below.</p><disp-formula id="scirp.78079-formula294"><label>(12)</label><graphic position="anchor" xlink:href="http://html.scirp.org/file/4-2180207x31.png"  xlink:type="simple"/></disp-formula><p>i.e. what we are asserting is that at Planck temperature, we are observing a convergence close to the value of where we may have the initiation of a Causal structure. If so, then is Entropy, initially created at the START pf causal structure, due to an opportune selection of a special unit of <inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x32.png" xlink:type="simple"/></inline-formula> i.e. note that in [<xref ref-type="bibr" rid="scirp.78079-ref8">8</xref>] we did suggest that the formation of the arrow of time, so done, would be a precursor of entropy, i.e. our argument may in itself be a first principle proof that the arrow of time, as initially formed, is a precursor for at least 1 unit of entropy created, and that this would be commensurate with making sense of</p><disp-formula id="scirp.78079-formula295"><label>(13)</label><graphic position="anchor" xlink:href="http://html.scirp.org/file/4-2180207x33.png"  xlink:type="simple"/></disp-formula><p>i.e. if we satisfy Equation (11), Equation (12), Equation (13) in the case of</p><p><inline-formula><inline-graphic xlink:href="http://html.scirp.org/file/4-2180207x34.png" xlink:type="simple"/></inline-formula>, we are also asserting that the formation of an</p><p>Inflaton, according to [<xref ref-type="bibr" rid="scirp.78079-ref5">5</xref>] , is in our estimation simultaneous with the formation of causal structure as indicated by Equation (12), as well as giving more inputs into the Padmadabhan model we used in [<xref ref-type="bibr" rid="scirp.78079-ref8">8</xref>] for the inflaton, i.e. [<xref ref-type="bibr" rid="scirp.78079-ref14">14</xref>] , as well as the idea given by Corda as to the Gravity’s breath suggestion he made. The author is aware of which the author finds quite pleasing to contemplate [<xref ref-type="bibr" rid="scirp.78079-ref15">15</xref>] .</p><p>In doing so, in the formation of Causal structure, so long as it does not contravene the outer measure definition given in [<xref ref-type="bibr" rid="scirp.78079-ref10">10</xref>] and requirements linked toward getting Equation (11) satisfied, we are not in trouble, at least mathematically for the time being. We will be using the nonsingular approach pioneered by [<xref ref-type="bibr" rid="scirp.78079-ref16">16</xref>] and [<xref ref-type="bibr" rid="scirp.78079-ref17">17</xref>] and we should do our best to avoid problems in our analysis which may contradict the LIGO results of [<xref ref-type="bibr" rid="scirp.78079-ref18">18</xref>] and [<xref ref-type="bibr" rid="scirp.78079-ref19">19</xref>] [<xref ref-type="bibr" rid="scirp.78079-ref20">20</xref>] , especially if each single count of n, as referenced to entropy is in common with gravitons. Also, our analysis should be further refined to take into account [<xref ref-type="bibr" rid="scirp.78079-ref20">20</xref>] , which may be with initial doable instrument refinements. Even so, we also point to [<xref ref-type="bibr" rid="scirp.78079-ref21">21</xref>] as having relevance to early universe work in our future endeavors [<xref ref-type="bibr" rid="scirp.78079-ref22">22</xref>] .</p></sec><sec id="s6"><title>Acknowledgements</title><p>This work is supported in part by National Nature Science Foundation of China Grant No. 11375279.</p></sec><sec id="s7"><title>Cite this paper</title><p>Beckwith, A.W. (2017) Isolating a Minimum Radius of the Universe Consistent with the Production of at Least 1 Unit of Entropy, at the Start of Inflation. Journal of High Energy Physics, Gravitation and Cosmology, 3, 461-466. https://doi.org/10.4236/jhepgc.2017.33036</p></sec></body><back><ref-list><title>References</title><ref id="scirp.78079-ref1"><label>1</label><mixed-citation publication-type="other" xlink:type="simple">Reichl, L. (1980) A Modern Course in Statistical Physics. 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