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<b><span style="font-size:20.0pt;color:#143C62">Fall 2026 Colloquium<o:p></o:p></span></b></p>
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<b><span style="font-size:12.0pt;color:#143C62">Thursday, October 1, 2026 4pm to 5pm<o:p></o:p></span></b></p>
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<b><span style="font-size:12.0pt;color:#143C62">127 McFarland Science Building<o:p></o:p></span></b></p>
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<i><span style="font-size:12.0pt;font-family:"Monotype Corsiva";color:#143C62">(Refreshments served at 3:50pm)<o:p></o:p></span></i></p>
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<i><span style="font-size:12.0pt;font-family:"Monotype Corsiva""><o:p> </o:p></span></i></p>
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<b><span style="font-size:18.0pt;color:#143C62">The Powerful Tides and Nonlinear Waves in Stars and Planets<o:p></o:p></span></b></p>
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<b><span style="font-size:14.0pt;color:#143C62">Dr. Nevin Weinberg University of Texas at Arlington<o:p></o:p></span></b></p>
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<b><span style="font-size:18.0pt;color:#F4AD00;letter-spacing:-.1pt">Abstract<o:p></o:p></span></b></p>
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<span style="font-size:12.0pt;color:#143C62">Tides<span style="letter-spacing:-.05pt">
</span>significantly<span style="letter-spacing:-.05pt"> </span>impact<span style="letter-spacing:-.1pt">
</span>the structure,<span style="letter-spacing:-.15pt"> </span>evolution,<span style="letter-spacing:-.15pt">
</span>and<span style="letter-spacing:-.1pt"> </span>fate<span style="letter-spacing:-.1pt">
</span>of<span style="letter-spacing:-.1pt"> </span>many<span style="letter-spacing:-.2pt">
</span>types<span style="letter-spacing:-.3pt"> </span>of close<span style="letter-spacing:-.1pt">
</span>binary<span style="letter-spacing:-.05pt"> </span>systems,<span style="letter-spacing:-.05pt">
</span>including<span style="letter-spacing:-.05pt"> </span>stellar<span style="letter-spacing:-.15pt">
</span>binaries<span style="letter-spacing:-.15pt"> </span>and short-period exoplanets.<span style="letter-spacing:2.5pt">
</span>In many<span style="letter-spacing:-.05pt"> </span>of<span style="letter-spacing:-.1pt">
</span>these systems, the<span style="letter-spacing:-.1pt"> </span>tide’s<span style="letter-spacing:-.05pt">
</span>amplitude is<span style="letter-spacing:-.05pt"> </span>so large<span style="letter-spacing:-.1pt">
</span>that<span style="letter-spacing:-.1pt"> </span>it<span style="letter-spacing:-.1pt">
</span>cannot<span style="letter-spacing:-.1pt"> </span>be<span style="letter-spacing:-.1pt">
</span>treated<span style="letter-spacing:-.1pt"> </span>as<span style="letter-spacing:-.05pt">
</span>a<span style="letter-spacing:-.15pt"> </span>small, linear perturbation.<span style="letter-spacing:2.65pt">
</span>I<span style="letter-spacing:-.15pt"> </span>will show<span style="letter-spacing:-.1pt">
</span>that<span style="letter-spacing:-.1pt"> </span>nonlinear effects<span style="letter-spacing:-.05pt">
</span>can greatly<span style="letter-spacing:-.05pt"> </span>enhance<span style="letter-spacing:-.1pt">
</span>the<span style="letter-spacing:-.1pt"> </span>rate<span style="letter-spacing:-.1pt">
</span>of<span style="letter-spacing:-.1pt"> </span>tidal dissipation<span style="letter-spacing:-.1pt">
</span>and<span style="letter-spacing:-.1pt"> </span>thus<span style="letter-spacing:-.05pt">
</span>the<span style="letter-spacing:-.1pt"> </span>rate of<span style="letter-spacing:-.1pt">
</span>binary<span style="letter-spacing:-.05pt"> </span>evolution.<span style="letter-spacing:2.5pt">
</span>As<span style="letter-spacing:-.05pt"> </span>examples, I<span style="letter-spacing:-.05pt">
</span>will<span style="letter-spacing:-.15pt"> </span>describe<span style="letter-spacing:-.1pt">
</span>how<span style="letter-spacing:-.1pt"> </span>nonlinear tides<span style="letter-spacing:-.05pt">
</span>influence the<span style="letter-spacing:-.1pt"> </span>formation and<span style="letter-spacing:-.1pt">
</span>orbital<span style="letter-spacing:-.15pt"> </span>evolution of<span style="letter-spacing:-.1pt">
</span>hot<span style="letter-spacing:-.1pt"> </span>Jupiter's<span style="letter-spacing:-.05pt">
</span>and<span style="letter-spacing:-.1pt"> </span>the gravitational-wave signal<span style="letter-spacing:-.15pt">
</span>of<span style="letter-spacing:-.1pt"> </span>compact<span style="letter-spacing:-.1pt">
</span>object<span style="letter-spacing:-.1pt"> </span>binaries.<span style="letter-spacing:2.65pt">
</span>In<span style="letter-spacing:-.1pt"> </span>the second<span style="letter-spacing:-.1pt">
</span>part<span style="letter-spacing:-.1pt"> </span>of<span style="letter-spacing:-.1pt">
</span>my<span style="letter-spacing:-.05pt"> </span>talk, I<span style="letter-spacing:-.15pt">
</span>will<span style="letter-spacing:-.15pt"> </span>discuss<span style="letter-spacing:-.15pt">
</span>the<span style="letter-spacing:-.05pt"> </span>nonlinearity<span style="letter-spacing:-.05pt">
</span>of<span style="letter-spacing:-.1pt"> </span>waves<span style="letter-spacing:-.05pt">
</span>excited in isolated stars<span style="letter-spacing:-.05pt"> </span>such as<span style="letter-spacing:-.05pt">
</span>red giants<span style="letter-spacing:-.15pt"> </span>and<span style="letter-spacing:-.1pt">
</span>pulsating<span style="letter-spacing:-.05pt"> </span>variables.<span style="letter-spacing:2.5pt">
</span>Here<span style="letter-spacing:-.1pt"> </span>our<span style="letter-spacing:-.05pt">
</span>study<span style="letter-spacing:-.05pt"> </span>is<span style="letter-spacing:-.15pt">
</span>motivated<span style="letter-spacing:-.1pt"> </span>by<span style="letter-spacing:-.05pt">
</span>the rich<span style="letter-spacing:-.1pt"> </span>oscillation spectra<span style="letter-spacing:-.25pt">
</span>observed by<span style="letter-spacing:-.05pt"> </span>space missions<span style="letter-spacing:-.05pt">
</span>such as<span style="letter-spacing:-.05pt"> </span>Kepler<span style="letter-spacing:-.15pt">
</span>and TESS,<span style="letter-spacing:-.05pt"> </span>which<span style="letter-spacing:-.1pt">
</span>revolutionized<span style="letter-spacing:-.1pt"> </span>the<span style="letter-spacing:-.1pt">
</span>field of asteroseismology<span style="letter-spacing:-.05pt"> </span>and<span style="letter-spacing:-.1pt">
</span>yielded a<span style="letter-spacing:-.15pt"> </span>wealth<span style="letter-spacing:-.1pt">
</span>of<span style="letter-spacing:-.1pt"> </span>information<span style="letter-spacing:-.1pt">
</span>about<span style="letter-spacing:-.1pt"> </span>the internal and<span style="letter-spacing:-.1pt">
</span>global properties<span style="letter-spacing:-.15pt"> </span>of<span style="letter-spacing:-.1pt">
</span>tens<span style="letter-spacing:-.05pt"> </span>of<span style="letter-spacing:-.1pt">
</span>thousands<span style="letter-spacing:-.05pt"> </span>of<span style="letter-spacing:-.1pt">
</span>stars.<o:p></o:p></span></p>
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<span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="punctuation-wrap:simple;text-autospace:none"><b><span style="font-size:18.0pt;color:#D59900">Dr. Nevin Weinberg<o:p></o:p></span></b></p>
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<span style="font-size:12.0pt;color:#143C62">Dr. Weinberg<span style="letter-spacing:-.1pt">
</span>received his BS in<span style="letter-spacing:-.05pt"> </span>physics and math<span style="letter-spacing:-.15pt">
</span>from<span style="letter-spacing:-.1pt"> </span>the University of Chicago<span style="letter-spacing:-.05pt">
</span>in<span style="letter-spacing:-.15pt"> </span>2000<span style="letter-spacing:-.05pt">
</span>and his PhD<span style="letter-spacing:-.05pt"> </span>in astrophysics from Caltech in 2005.<span style="letter-spacing:2.6pt">
</span>He<span style="letter-spacing:-.05pt"> </span>was<span style="letter-spacing:-.1pt">
</span>a postdoctoral<span style="letter-spacing:-.1pt"> </span>fellow<span style="letter-spacing:-.05pt">
</span>at<span style="letter-spacing:-.05pt"> </span>the Kavli Institute<span style="letter-spacing:-.05pt">
</span>for Theoretical<span style="letter-spacing:-.1pt"> </span>Physics in Santa Barbara<span style="letter-spacing:-.1pt">
</span>and at<span style="letter-spacing:-.05pt"> </span>the University of California,<span style="letter-spacing:-.1pt">
</span>Berkeley.<span style="letter-spacing:2.75pt"> </span>In 2011,<span style="letter-spacing:-.1pt">
</span>he<span style="letter-spacing:-.05pt"> </span>joined<span style="letter-spacing:-.05pt">
</span>the<span style="letter-spacing:-.05pt"> </span>MIT physics department as<span style="letter-spacing:-.1pt">
</span>an assistant<span style="letter-spacing:-.05pt"> </span>professor<span style="letter-spacing:-.1pt">
</span>and<span style="letter-spacing:-.05pt"> </span>in<span style="letter-spacing:-.05pt">
</span>2016 became an associate<span style="letter-spacing:-.05pt"> </span>professor.<span style="letter-spacing:2.75pt">
</span>In 2020,<span style="letter-spacing:-.1pt"> </span>Dr.<span style="letter-spacing:-.15pt">
</span>Weinberg<span style="letter-spacing:-.1pt"> </span>joined the<span style="letter-spacing:-.05pt">
</span>UTA<span style="letter-spacing:-.1pt"> </span>physics department<span style="letter-spacing:-.05pt">
</span>and became a<span style="letter-spacing:-.1pt"> </span>full<span style="letter-spacing:-.1pt">
</span>professor<span style="letter-spacing:-.1pt"> </span>in 2024.<o:p></o:p></span></p>
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<span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<span style="font-size:12.0pt;color:#143C62">His research group studies a variety of astrophysical phenomena<span style="letter-spacing:-.05pt">
</span>related to stellar fluid dynamics and binary<span style="letter-spacing:-.1pt">
</span>evolution,<span style="letter-spacing:-.05pt"> </span>including tides in coalescing neutron star<span style="letter-spacing:-.05pt">
</span>binaries, stellar binaries and exoplanetary systems, stellar seismology, and thermonuclear<span style="letter-spacing:-.05pt">
</span>burning on the surfaces of accreting<span style="letter-spacing:-.05pt"> </span>
neutron stars (X-ray bursts).<o:p></o:p></span></p>
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<span style="font-size:12.0pt;color:#143C62"><o:p> </o:p></span></p>
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<i><span style="font-size:10.0pt;color:black"><a href="https://sites.google.com/view/pha-tamuc-colloquium/phas-tamuc-colloquium">https://sites.google.com/view/pha-tamuc-colloquium/phas-tamuc-colloquium</a></span></i><span style="font-size:12.0pt;color:#143C62"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:13.5pt;color:#00386C">Sandra K. Nichol<o:p></o:p></span></b></p>
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<p class="MsoNormal"><i><span style="font-size:12.0pt;color:#4F5352">Administrative Associate III</span></i><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:#4F5352">Physics & Astronomy<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:#4F5352;text-transform:uppercase">P: 903.886.5488</span><span style="font-size:12.0pt;color:#4F5352"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:26.25pt"><span style="color:black"><a href="https://www.etamu.edu/"><span style="font-size:13.5pt;color:blue;text-decoration:none"><img border="0" width="250" height="33" style="width:2.6083in;height:.3416in" id="Picture_x0020_1" src="cid:image003.gif@01DD4F4D.FC3264A0" alt="East Texas A&M logo"></span></a></span><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
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