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SUMMARY:Oliver Schlotterer: From loop integrals to modular graph forms
DTSTART:20260401T113000Z
DTEND:20260401T123000Z
DTSTAMP:20260407T053800Z
UID:indico-event-2085@indico.uu.se
DESCRIPTION:The low-energy expansion of loop-level string amplitudes featu
 res discontinuities in Mandelstam invariants to all orders in alpha’ whi
 ch reflect matrix elements of higher-derivative operators Tr(D^{2k} F^n) a
 nd D^{2k} R^n in the effective action. The UV divergences of the one-loop 
 matrix elements at fixed order in alpha’ were observed in 2107.08009 to 
 encode the cusp asymptotics of modular graph forms\, namely the non-holomo
 rphic modular forms that govern the analytic-in-Mandelstam parts of one-lo
 op string amplitudes. In joint work with Enrico and Michele\, we generaliz
 e this link to obtain the cusp asymptotics of *arbitrary* modular graph fo
 rms (also those beyond massless string amplitudes) from the UV regime of s
 tringy generating series of one-loop Feynman integrals.\n\nhttps://indico.
 uu.se/event/2085/
LOCATION:Å92110  (Ångströmslaboratoriet)
URL:https://indico.uu.se/event/2085/
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