In order to enable an iCal export link, your account needs to have an API key created. This key enables other applications to access data from within Indico even when you are neither using nor logged into the Indico system yourself with the link provided. Once created, you can manage your key at any time by going to 'My Profile' and looking under the tab entitled 'HTTP API'. Further information about HTTP API keys can be found in the Indico documentation.
Additionally to having an API key associated with your account, exporting private event information requires the usage of a persistent signature. This enables API URLs which do not expire after a few minutes so while the setting is active, anyone in possession of the link provided can access the information. Due to this, it is extremely important that you keep these links private and for your use only. If you think someone else may have acquired access to a link using this key in the future, you must immediately create a new key pair on the 'My Profile' page under the 'HTTP API' and update the iCalendar links afterwards.
Permanent link for public information only:
Permanent link for all public and protected information:
A large class of two-dimensional quantum fields theories contain an interesting operator built from the stress tensor, called "TTbar". Although this operator is irrelevant, adding it to the action generates a new family of theories in a controlled way. For conformal field theories with an Anti-de Sitter holographic dual, it has been conjectured that the TTbar deformation corresponds to "cutting off" the region of AdS beyond a hypersurface of fixed radius. We use the variational principle in the CFT to derive the holographic effect of the TTbar deformation at large N: it changes the boundary conditions of the metric at infinity. In the absence of matter and for a particular sign of the deformation parameter, this can be reinterpreted as Dirichlet conditions at finite radius; albeit without discarding the region outside. This interpretation breaks down when matter is present, whereas the mixed boundary conditions prevail. The asymptotic symmetries of the gravitational theory with mixed boundary conditions form two Virasoro algebras, the generators of which are state-dependent but the central charge remains unchanged.