# String Theory Seminar

### 19/05/2014, 17:00 — 18:00 — Room P3.10, Mathematics Building

Alessandro Tomasiello, *Università degli Studi di Milano-Bicocca*

### All \( AdS_7 \) solutions in type II supergravity, and their CFT
duals

In M-theory, the only \( AdS_7 \) supersymmetric solutions are
\( AdS_7 \times S^4 \) and its orbifolds. In this talk, I will
first describe a classification of \( AdS_7 \) supersymmetric
solutions in type II supergravity. While in IIB none exist, in IIA
with Romans mass (which does not lift to M-theory) there are many
new ones. Pure spinor methods determine the metric and fluxes
without the need for any Ansatz, up to solving a system of ODEs.
The internal space \( M_3 \) is an \( S^2 \) fibration over an
interval. I will then propose the holographically dual \( (1,0) \)
CFTs in six dimensions. It is conjectured that the \( AdS_7 \)
duals represent near-horizon limits of NS5-D6-D8 systems in flat
space. The new field theories arise as endpoints of RG flows
triggered by expectation values on the Higgs branch of the \( (1,0)
\) theory describing multiple M5 branes transverse to an orbifold
singularity.