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:
The canonical definition of generalized Proca theories and beyond
(Max Planck Institute for Physics)
As it is well known, the Lagrangian picture of any theory is not
the best suited for a faithful counting of degrees of freedom. On the other
hand, implementing purely Hamiltonian approaches to singular theories can
be quite involved and not so practical, in particular when non-linearities
are present. In this talk, we present a hybrid Lagrangian-Hamiltonian
constraint algebra characterization of vector theories which are first
order and Abelian. Such theories are generically referred to as generalized
Proca theories or vector Galileons. Our machinery provides an unequivocal
degree of freedom counting and it unveils the necessary and sufficient
conditions to avoid ghosts.