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Description

Since the nineties, many 5d SCFT’s have been

constructed by placing M-theory on noncompact,

singular toric CY threefolds.

However, we know, since the results of Benini-

Benvenuti-Tachikawa, that there are extra pieces

of data in these setups that are only understood

through the IIB 5-brane web paradigm, but have

no known geometric counterpart.

In this talk, I will present the issue, and

demonstrate how data from nilpotent orbits of

the flavor group of the SCFT enter into the

definition of such setups, and how Hanany-

Witten moves uplift to M-theory.

The main point of this talk is to show how string

theory captures physical information that is

usually lost by looking at spectral data in the form

of geometry.