# Week 29.09.2018 – 07.10.2018

### Tuesday

#### Relating duality covariant approaches to higher derivatives in the heterotic string

Regular Seminar Diego Marques (Buenos Aires)

 at: 13:30 ICroom H503 abstract: There are two approaches to duality covariant first order alpha-prime corrections to the heterotic string. One is based on an extension of the duality structure, and the other relies on deformed gauge transformations. I will introduce an all order framework from which both approaches can be derived, proving their equivalence and extending them to higher orders.

### Thursday

#### Disconnected gauge theories

Regular Seminar Diego Rodriguez-Gomez (Oviedo U.)

 at: 14:00 QMWroom G O Jones 610 abstract: Disconnected gauge groups have been, at least comparatively, very poorly studied. Yet they may hide very interesting Physics. Recently, a class of gauge theories based on a particular type of disconnected gauge groups, namely principal extensions, has been introduced. Interestingly, such theories naturally implement the gauging of charge conjugation. In this talk, we will describe such construction and study aspects of its Physics. A particularly spectacular by-product of the construction is that these theories have non-freely generated Coulomb branches, thus providing the first counterexample of the long standing standard lore that Coulomb branch are all freely generated.