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<div class="WordSection1"><span style="font-family:'times new roman' , 'times' , serif"><b><span style="color:#ff0000"><span style="font-family:'normal' , ,;display:inline !important;float:none">If
attending an event at the IAS, for
contact tracing purposes all <span style="color:#0000ff">off-campus</span>
participants must register. IAS <span style="color:#0000ff">off-campus</span>
attendees must also upload proof
of vaccination, INCLUDING A
BOOSTER DOSE, to <a href="https://app.crowdpass.co/auth/1887" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank">https://app.crowdpass.co/auth/1887</a></span></span></b><br>
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<div style="color:#000000;font-family:'roman'"><span style="font-family:'times new roman' , 'times' , serif;font-size:12pt">IAS
Policy: </span><span style="font-family:'roman';color:rgb( 5 , 99 , 193 )"><u><a href="https://www.ias.edu/covid-19-procedures" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank">https://www.ias.edu/covid-19-procedures</a></u></span><br>
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<div style="color:#000000;font-family:'roman'"><span style="font-family:'roman' 'times'"><span style="color:#0563c1"><u><br>
<a href="https://www.ias.edu/sns/covid-19-policy-attending-campus-events" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank">IAS
Policy on Attending Campus
Events</a><br>
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<p class="MsoDate" style="color:#000000;font-size:12pt;margin:0px"><span style="font-family:'times new roman' , 'times' , serif"><strong></strong><font face="Times New Roman, Times, serif"><strong><b><strong>Wednesday,
June 15, 2022 -- IAS Physics
Group Meeting</strong> </b> </strong></font></span></p>
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<a href="https://www.ias.edu/sns/events/ias-physics-group-meeting-14" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" style="color:#000000;font-size:12pt" target="_blank"> </a> </font>
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<p class="MsoNormal" style="margin:0px"><font face="Times New Roman, Times, serif"><a href="https://www.ias.edu/sns/events/ias-physics-group-meeting-21" rel="nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank">"Discrete
Chiral Symmetry and Mass Shift in
Lattice Hamiltonian Approach to
Schwinger Model"</a><br>
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<a href="https://www.ias.edu/sns/events/ias-physics-group-meeting-14" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" style="color:#000000;font-size:12pt" target="_blank"> </a><span style="color:rgb( 0 , 0 , 0 )"><a href="https://www.ias.edu/sns/events/ias-physics-group-meeting-14" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank"> </a><br>
Location: Bloomberg Lecture Hall (IAS)
& Zoom</span> </font>
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<span style="color:rgb( 0 , 0 , 0 )"><b><span style="color:#ff0000">Please do
not share this Zoom link</span></b></span><span style="color:rgb( 0 , 0 , 0 )"><strong></strong>
</span><br>
<span style="color:rgb( 0 , 0 , 0 );font-size:12pt">Zoom Link: <a href="https://theias.zoom.us/j/92932564433?pwd=MGRucWIxd1FlODdnd1paY244eE5sdz09" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank">https://theias.zoom.us/j/92932564433?pwd=MGRucWIxd1FlODdnd1paY244eE5sdz09</a></span><span style="color:rgb( 0 , 0 , 0 )"> </span><span style="color:#000000;font-size:12pt">
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<p class="MsoListCxSpMiddle" style="color:#000000;font-size:12pt;margin:0px;text-indent:0in"><font face="Times New Roman, Times, serif">Time:
1:45 PM<br>
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<p class="MsoListCxSpMiddle" style="margin:0px;text-indent:0in"><font face="Times New Roman, Times, serif"><span style="font-size:12pt"><strong></strong>Speaker:
Igor Klebanov, Princeton University;
Member, School of Natural Sciences,
IAS</span><span style="text-indent:0in;font-size:12pt"></span></font></p>
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<p class="MsoNormal" style="color:#000000;font-size:12pt;margin:0px"><font face="Times New Roman, Times, serif"><strong><span style="color:#000000;font-family:'roman' 'new york' serif;font-size:16px;font-style:normal;font-weight:400;letter-spacing:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:#ffffff;float:none;display:inline !important">Proof of
Vaccination: <span style="font-size:11pt;line-height:15.6933px"><a href="https://app.crowdpass.co/auth/1887" rel="noopener nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" style="color:#0563c1;text-decoration:underline" target="_blank"><span style="font-size:12pt;line-height:17.12px;color:blue">https://app.crowdpass.co/auth/1887</span></a><br>
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<span style="font-size:12pt">Registration:
</span><a href="https://forms.ias.edu/form/ias-sns-physics-group-meetings" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank"><span style="font-size:12pt"></span>https://forms.ias.edu/form/ias-sns-physics-group-meetings<br>
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<p><font face="Times New Roman, Times,
serif"><strong>Abstract: </strong>We
revisit the lattice formulation of the
Schwinger model using the
Kogut-Susskind Hamiltonian approach
with staggered fermions. This model,
introduced by Banks et al., contains
the mass term $m_{\rm lat} \sum_{n}
(-1)^{n} \chi^\dagger_n \chi_n$, and
setting it to zero is often assumed to
provide the lattice regularization of
the massless Schwinger model. We
instead argue that the relation
between the lattice and continuum mass
parameters should be taken as $m_{\rm
lat}=m- \frac{1}{8} e^2 a$. The model
with $m=0$ is shown to possess a
discrete chiral symmetry that is
generated by the unit lattice
translation accompanied by the shift
of the $\theta$-angle by $\pi$. While
the mass shift vanishes as the lattice
spacing $a$ approaches zero, we find
that including this shift greatly
improves the rate of convergence to
the continuum limit. We demonstrate
the faster convergence using both
numerical diagonalizations of finite
lattice systems, as well as
extrapolations of the lattice strong
coupling expansions.</font></p>
<p><font face="Times New Roman, Times,
serif">The talk will be based mostly
on the recent paper in collaboration
with Ross Dempsey, Silviu Pufu and
Bernardo Zan:</font></p>
<p><font face="Times New Roman, Times,
serif"><a href="https://arxiv.org/abs/2206.05308" target="_blank" rel="nofollow noopener noreferrer">[2206.05308] Discrete Chiral
Symmetry and Mass Shift in Lattice
Hamiltonian Approach to Schwinger
Model (arxiv.org)</a></font></p>
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<span style="color:#000000;font-family:'roman';font-size:12pt"></span><span style="color:#000000;font-size:12pt;font-family:'times new roman' , 'times' , serif">To view the calendar
online, go to:</span> <span style="color:#000000;font-family:'roman' 'times'"> </span>
<p class="MsoNormal" style="color:#000000;font-family:'roman' 'york'"><span style="font-family:'new roman' 'times'"><a href="https://www.ias.edu/sns/events/physics" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank">https://www.ias.edu/sns/events/physics</a></span></p>
<hr style="color:#000000;font-family:'arial' , 'helvetica' , sans-serif;font-size:12pt" width="100%" size="2"><span style="font-size:12pt">---------------------<br>
</span><span style="font-size:12pt">Lisa
Fleischer<br>
</span><span style="font-size:12pt">School
of Natural Sciences<br>
</span><span style="font-size:12pt">Institute
for Advanced Study<br>
</span><span style="font-size:12pt">1
Einstein Drive<br>
</span><span style="font-size:12pt">Princeton,
NJ 08540<br>
</span><span style="font-size:12pt"></span><a href="mailto:lisa@ias.edu" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" style="font-size:12pt" target="_blank">lisa@ias.edu</a></div>
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