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:
General arguments indicate that Feynman integrals can be thought as
period integrals. This talk aims to make this relation concrete on a certain class of quantum field theory amplitudes in a two-dimensional space-time. We will show, on some precise examples, how a Feynman integral is given by a period of a variation of a mixed Hodge structure.
We will discuss special cases which can be expressed in terms of elliptic multiple-polylogarithms.
This is based on the work [arXiv:1309.5865] done in collaboration with
Spencer Bloch, and in work in progress with Spencer Bloch and Matt Kerr.