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:
Steve Carlip (UC Davis), BLACK HOLE ENTROPY FROM HORIZON CONSTRAINTS
To describe black hole thermodynamics in any quantum theory of
gravity, one must introduce constraints that ensure that a black
hole is actually present. I show that for a very large class of
dilaton black holes, the inclusion of such ``horizon constraints''
allows us to use conformal field theory techniques to compute the
density of states, reproducing the correct Bekenstein-Hawking entropy
in a nearly model-independent manner. This picture suggests an
elegant description of the relevant degrees of freedom, as
Goldstone-boson-like excitations arising from symmetry breaking
by a conformal anomaly induced by the horizon constraints.