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<p class="art-type" id="articleinfo">Editorial Article</p>
<p class="art-title">The Ives-Stilwell Experiment for the Case of the Accelerated Source</p>
<p class="art-author"><?php $authors="A. Sfarti"; echo (stristr($authors,$coauthor))?str_replace($coauthor,"<a href='".$extpath."authors/".$courl."' target='_blank'>".$coauthor."</a>",$authors):$authors; ?></p>
<p class="art-affl">Computer Science Division, University of California, USA</p>
<p class="art-aff"><b>*Corresponding author: <?php $corresponding_author="A. Sfarti"; echo ($coauthor!="" && $coauthor==$corresponding_author)?"<a href='".$extpath."authors/".$courl."' target='_blank'>".$coauthor."</a>":$corresponding_author;?></b>, Computer Science Division, University of California, Berkeley
387 Soda Hall, USA, E-mail: <a href="mailto:egas@pacbell.net">egas@pacbell.net</a></p>
<p class="art-aff"><b>Received:</b> December 12, 2023 <b>Accepted:</b> December 22, 2023 <b>Published:</b> December 28, 2023</p>
<p class="art-aff"><b>Citation:</b> Sfarti A. The Ives-Stilwell Experiment for the Case of the Accelerated Source. <i>Int J Cosmol Astron Astrophys</i>. 2023; 5(2): 240-242. doi: <a href="https://doi.org/10.18689/ijcaa-1000145">10.18689/ijcaa-1000145</a></p>
<p class="art-aff"><b>Copyright:</b> &copy; 2023 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</p>
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<p class="art-subhead" id="abstract">Abstract</p>
<p class="art-para">In the current paper we derive the general form of the relativistic Doppler effect and of the relativistic aberration for the case of accelerated motion of the source with respect to an inertial receiver. The formalism enables us to derive the formalism of the IvesStilwell class of experiments for the realistic case of accelerated sources of electromagnetic waves.</p>
<p class="art-para"><b>Keywords:</b> Accelerated motion, general coordinate transformations, accelerated particles, planar electromagnetic waves, relativistic Doppler effect, relativistic aberration, Ives-Stilwell class of experiments</p>
<p class="art-para"><b>PACS:</b> 03.30.+p, 52.20.Dq, 52.70.Nc</p>
<p class="art-subhead" id="intro">1. Introduction</p>
<p class="art-para">In the current paper, we are presenting the equations of electrodynamics in an accelerated frame as a starting point for the derivation of the Doppler effect in the case of uniformly accelerated source. The resultant equations are used for the derivation of the formalism for the Ives-Stilwell class of experiments in the case of uniformly accelerated source.</p>
<p class="art-subhead">2. Accelerated Rectilinear Motion &#8211; the Transformations of the Electromagnetic Field</p>
<p class="art-para">Let S represent an inertial system of coordinates and S '(&#964;) an accelerated one. According to references <a href="#1" id="ref1">[1</a>,<a href="#2" id="ref2">2]</a> in the accelerated frame S '(&#964;) the planar wave equation of the electric field E' is :</p>
<div class="art-img" id="e001">
<img src="<?php echo $imgpath;?>images/ijcaa-145-e001.gif" class="img-responsive center-block"/></div>
<p class="art-para">According to references <a href="#1" id="ref1">[1</a>-<a href="#3" id="ref3">3]</a> the coordinate transformation from the inertial frame S into the accelerated frame S '(&#964;) is:</p>
<div class="art-img" id="e002">
<img src="<?php echo $imgpath;?>images/ijcaa-145-e002.gif" class="img-responsive center-block"/></div>
<p class="art-para">
where &#8220;c&#8221; is the speed of light in vacuum, &#8220;g&#8221; is the proper acceleration, &#964; is the proper time. Substituting (2.2) into (2.1)
we obtain:</p>
<div class="art-img" id="e003">
<img src="<?php echo $imgpath;?>images/ijcaa-145-e003.gif" class="img-responsive center-block"/></div>
<p class="art-para">On the other hand, in the inertial frame S, the wave equation is:</p>
<div class="art-img" id="e004">
<img src="<?php echo $imgpath;?>images/ijcaa-145-e004.gif" class="img-responsive center-block"/></div>
<p class="art-para">Since references <a href="#1" id="ref1">[1</a>,<a href="#2" id="ref2">2]</a> demonstrated that E'<sub>x</sub> = E<sub>x</sub> it follows that:</p>
<div class="art-img" id="e005">
<img src="<?php echo $imgpath;?>images/ijcaa-145-e005.gif" class="img-responsive center-block"/></div>
<p class="art-para">The formula <img src="<?php echo $imgpath;?>images/ijcaa-145-te001.gif" class="img-responsive center-block"/> represents the general formula of the Doppler effect due to acceleration.</p>
<p class="art-subhead">3. The Theory of the Ives-Stilwell Class of Experiments for the Case of Uniformly Accelerated Source</p>
<p class="art-para">One of the glossed over issues with the Ives-Stilwell experiment is the fact that the ions that act as light sources are, in fact, in accelerated motion under the electric field. For example, the 1938 experiment <a href="#4" id="ref4">[4]</a> used a 20,000V potential difference. In the 1941 experiment <a href="#5" id="ref5">[5]</a> a four-electrode version of the canal ray tube with three gaps was used, producing a total potential difference of 43,000 volts. A voltage drop of
5,000 volts was used across the first gap, while the remaining voltage drop was distributed between the second and third gaps. In fact, all the experiments in the Ives-Stilwell class <a href="#6" id="ref6">[6</a>-
<a href="#16" id="ref16">16]</a> rely on accelerated, not uniform motion of the source. Hence, the correct formalism needs to rely on the accelerated Doppler effect (2.5). Considering two counter-propagating waves, we can derive the average pulsation:</p>
<div class="art-img" id="e0031">
<img src="<?php echo $imgpath;?>images/ijcaa-145-e0031.gif" class="img-responsive center-block"/></div>
<p class="art-para">In (3.1) , &#969;<sub>p</sub> &#969;<sub>a</sub> represent the pulsations of the light waves emitted by the ions moving alongside an arbitrary line, in opposite directions (parallel and anti-parallel, respectively). Notice the similarity to the formalism &#969;<sub>average</sub> = &#969;'&#947; (v) derived for uniform motion of the ions <a href="#6" id="ref6">[6</a>,<a href="#15" id="ref15">15</a>,<a href="#61" id="ref16">16]</a>.</p>
<p class="art-para">Notice that:</p>
<p class="art-para"><div class="art-img" id="e0032">
<img src="<?php echo $imgpath;?>images/ijcaa-145-e0032.gif" class="img-responsive center-block"/></div>
<div class="art-img" id="e0033">
<img src="<?php echo $imgpath;?>images/ijcaa-145-e0033.gif" class="img-responsive center-block"/></div>
At the speeds at which the Ives-Stilwell experiments are being conducted <a href="#7" id="ref7">[7</a>-<a href="#14" id="ref14">14]</a>, &#946; = 0.064 so expressions (3.2) and (3.3) are very close. At higher speeds, though, the expressions start diverging from each other so the exact formalism derived in this paper becomes necessary.</p>
<p class="art-subhead" id="conclsion">Conclusions</p>
<p class="art-para">We constructed the general formalism for the case of the accelerated Doppler effect between the frame S '(&#964;) co-moving with an accelerated particle in rectilinear motion into an inertial frame of reference S. The solution is of great interest for real life applications, because it enabled us to derive the formalism for the Ives-Stilwell experiment in the case of accelerated source.</p>
<p class="art-subhead" id="references">References</p>
<ol>
<li class="ref"><div id="1">Sfarti A. <a href="https://oaji.net/articles/2017/4503-1514187399.pdf" target="_blank">Electrodynamics in Accelerated Frames</a>. <i>Th Phys</i>. 2017; 2(4). doi: 10.22606/tp.2017.24003&nbsp;&nbsp;&nbsp;<a href="#ref1"><i class="fa fa-level-up" aria-hidden="true"></i></a></div></li>
<li class="ref"><div id="2">Sfarti A. <a href="https://www.academia.edu/80625578/Electrodynamics_in_Accelerated_Frames" target="_blank">Electrodynamics in Uniformly Accelerated Frames as Viewed from an Inertial Frame</a>. <i>IJPOT</i>. 2017; 3(1).&nbsp;&nbsp;&nbsp;<a href="#ref2"><i class="fa fa-level-up" aria-hidden="true"></i></a></div></li>
<li class="ref"><div id="3">Sfarti A. Generalization of Coordinate Transformations between Accelerated and Inertial Frames &#8211; General Formulas of Thomas recession. <i>JAPSI</i>. 2017; 8(2).&nbsp;&nbsp;&nbsp;<a href="#ref3"><i class="fa fa-level-up" aria-hidden="true"></i></a></div></li>
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