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:
Fractional Charge in Time-Inversion Invariant Systems
The essence of quantum mechanics is that dynamical
entities, like energy or angular momentum, which can take arbitrary
values within classical physics, become quantized within quantum
physics. I shall describe an inverse phenomenon: Classical entities
like particle number or charge possess an intrinsic integrality; but
they can acquire fractional values upon quantization. I shall
describe how this phenomenon is realized through zero modes of a
Dirac equation, and how the effect manifests itself in condensed