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<div><b><font face="Times New Roman, Times, serif">High
Energy Theory Seminar -- Monday, May 17, 2021</font></b><font
face="Times New Roman, Times, serif"><br>
<br>
"Superstring Amplitudes in Genus 0 and Double
Copy"<br>
<br>
Location: via ZOOM -- Time: 2:30 PM<br>
<br>
Francis Brown, Oxford University<br>
<br>
<b><font color="#0000ff">To connect to the HET
Seminar via Zoom, please click the following
link:<br>
<br>
</font></b><font color="#0000ff"><font
color="#000000"><a
href="https://theias.zoom.us/j/83432499354?pwd=TkhMZWFJK2E1UzRyeUppU01pZVQwUT09"
rel="nofollow noopener noreferrer nofollow
noopener noreferrer nofollow noopener
noreferrer nofollow noopener noreferrer"
target="_blank" moz-do-not-send="true">https://theias.zoom.us/j/83432499354?pwd=TkhMZWFJK2E1UzRyeUppU01pZVQwUT09</a><br>
<br>
Abstract: This is joint work with Clément
Dupont. Motivated by double-copy
(Kawai-Lewellen-Tye) formulae relating open
and closed superstring amplitudes at
tree-level, I will explain a general
double-copy formula for period integrals on
algebraic varieties and its relation to
single-valued functions. As an application, we
deduce a conjecture of Stieberger which states
that the passage from open to closed
amplitudes in string perturbation theory at
genus zero is given by the so-called
single-valued map. </font></font><b><font
color="#0000ff"><br>
</font></b></font>
<pre class="moz-signature">---------
Lisa Fleischer
School of Natural Sciences
Institute for Advanced Study
1 Einstein Drive
Princeton, NJ 08540
<a href="mailto:lisa@ias.edu" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank" moz-do-not-send="true">lisa@ias.edu</a></pre>
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