Difference between revisions of "NTS ABSTRACTFall2019"

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{| style="color:black; font-size:100%" table border="2" cellpadding="10" width="700" cellspacing="20"
 
{| style="color:black; font-size:100%" table border="2" cellpadding="10" width="700" cellspacing="20"
 
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| bgcolor="#F0A0A0" align="center" style="font-size:125%" | '''Will Sawin'''
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| bgcolor="#F0A0A0" align="center" style="font-size:125%" | '''Yingkun Li'''
 
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| bgcolor="#BCD2EE"  align="center" |  The sup-norm problem for automorphic forms over function fields and geometry
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| bgcolor="#BCD2EE"  align="center" |  CM values of modular functions and factorization
 
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The sup-norm problem is a purely analytic question about
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The theory of complex multiplication tells us that the values of the j-invariant at CM points are algebraic integers. The norm of the difference of two such values has nice and explicit factorization, which was the subject of the seminal work of Gross and Zagier on singular moduli in the 1980s. In this talk, we will recall this classical result, review some recent factorization formula for other modular functions, and report some progress on a conjecture of Yui and Zagier. This is joint work with Tonghai Yang.
automorphic forms, which asks for bounds on their largest value (when
 
viewed as a function on a modular curve or similar space). We describe
 
a new approach to this problem in the function field setting, which we  
 
carry through to provide new bounds for forms in GL_2 stronger than
 
what can be proved for the analogous question about classical modular  
 
forms. This approach proceeds by viewing the automorphic form as a
 
geometric object, following Drinfeld. It should be possible to prove
 
bounds in greater generality by this approach in the future.
 
  
 
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Revision as of 08:54, 7 September 2019

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Sep 5

Will Sawin
The sup-norm problem for automorphic forms over function fields and geometry

The sup-norm problem is a purely analytic question about automorphic forms, which asks for bounds on their largest value (when viewed as a function on a modular curve or similar space). We describe a new approach to this problem in the function field setting, which we carry through to provide new bounds for forms in GL_2 stronger than what can be proved for the analogous question about classical modular forms. This approach proceeds by viewing the automorphic form as a geometric object, following Drinfeld. It should be possible to prove bounds in greater generality by this approach in the future.


Sep 12

Yingkun Li
CM values of modular functions and factorization

The theory of complex multiplication tells us that the values of the j-invariant at CM points are algebraic integers. The norm of the difference of two such values has nice and explicit factorization, which was the subject of the seminal work of Gross and Zagier on singular moduli in the 1980s. In this talk, we will recall this classical result, review some recent factorization formula for other modular functions, and report some progress on a conjecture of Yui and Zagier. This is joint work with Tonghai Yang.