<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Georgia;
panose-1:2 4 5 2 5 4 5 2 3 3;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
color:windowtext;}
h1
{mso-style-priority:9;
mso-style-link:"Heading 1 Char";
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:24.0pt;
font-family:"Arial","sans-serif";
color:#1E1918;
font-weight:normal;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoPlainText, li.MsoPlainText, div.MsoPlainText
{mso-style-priority:99;
mso-style-link:"Plain Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:10.5pt;
font-family:"Georgia","serif";
color:windowtext;}
p
{mso-style-priority:99;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:12.0pt;
font-family:"Times New Roman","serif";
color:black;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Georgia","serif";
color:windowtext;}
span.Heading1Char
{mso-style-name:"Heading 1 Char";
mso-style-priority:9;
mso-style-link:"Heading 1";
font-family:"Arial","sans-serif";
color:#1E1918;}
span.PlainTextChar
{mso-style-name:"Plain Text Char";
mso-style-priority:99;
mso-style-link:"Plain Text";
font-family:"Georgia","serif";}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoPlainText"><span style="font-size:11.0pt">Please take note of Colloquium taking place today, Tuesday, October 9, 2012 at 4:00 PM in The Robert Smith Seminar Room. There will be a reception in the Atrium at 3:45 PM. Details concerning the talk
are as follows:<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt">Speaker: Jason Hogan – Stanford University<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt">Date: Tuesday, October 9, 2012<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt">Time: 4:00 PM<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-size:11.0pt">Place: The Robert Smith Seminar Room<o:p></o:p></span></p>
<h1 style="margin:0in;margin-bottom:.0001pt;mso-add-space:auto"><span style="font-size:11.0pt;font-family:"Georgia","serif";color:black">Title:
</span><span lang="EN" style="font-size:11.0pt;font-family:"Georgia","serif";color:black">"<b><a href="https://physics.osu.edu/events/colloquium-jason-hogan-stanford-university-testing-general-relativity-using-atom-interferomet" title="Testing General Relativity using Atom Interferometry"><strong><span style="font-family:"Georgia","serif";color:black;font-weight:normal;text-decoration:none">Testing
General Relativity using Atom Interferometry</span></strong></a>"<o:p></o:p></b></span></h1>
<h1 style="margin:0in;margin-bottom:.0001pt;mso-add-space:auto"><span style="font-size:11.0pt;font-family:"Georgia","serif";color:black">Abstract:
</span><span lang="EN" style="font-size:11.0pt;font-family:"Georgia","serif";color:black">Recently there has been exciting progress in developing precision tests of gravity using atom
</span><span lang="EN" style="font-size:11.0pt;font-family:"Georgia","serif";color:#222222">interferometry. Neutral atoms make excellent gravitational "test particles" and atom interferometry allows for precise measurement of the inertial forces experienced
by the freely-falling atom de Broglie waves. To this end, we have built a 10-meter tall, atomic fountain gravimeter for the purpose of testing the Equivalence Principle with freely-falling atoms. I will report on the current status of this apparatus, which
promises to be the most sensitive atom interferometer ever built, with a projected differential acceleration sensitivity of 10<sup>-15</sup> g. This phenomenal force sensitivity gives access to science applications which I will discuss, including setting
new limits on the Equivalence Principle, measuring effects of General Relativity in a laboratory setting and detecting gravitational waves. I will also describe our recent proposals for atom-based gravitational wave detectors which appear to offer compelling
strain sensitivities in the 1 mHz to 10 Hz frequency range, providing access to a rich scientific region with substantial discovery potential.<o:p></o:p></span></h1>
<h1 style="margin:0in;margin-bottom:.0001pt;mso-add-space:auto"><span lang="EN" style="font-size:11.0pt;font-family:"Georgia","serif";color:black"><o:p> </o:p></span></h1>
<p class="MsoPlainText"><span style="font-size:11.0pt">The website for the Colloquium is
<a href="https://physics.osu.edu/physics-colloquium-schedule">https://physics.osu.edu/physics-colloquium-schedule</a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia","serif""><o:p> </o:p></span></p>
</div>
</body>
</html>