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 Messenger: a galactic centre gravitational-wave beacon
Our existence in the Universe resulted from a rare combination of circumstances. The same must be true for any advanced extraterrestrial civilisation. If there exist any in the Milky Way, they are likely scattered over large distances in space and time, however, they must be aware of the unique property of the Galactic centre: it hosts the closest massive black hole to anyone in the Galaxy. A sufficiently advanced civilisation may have placed material in orbit around this black hole to study it, extract energy from it, and/or for communication purposes. In either case, its orbital motion will necessarily be a source of gravitational waves. Here we show that a Jupiter-mass "Messenger" on the innermost stable circular orbit around the black hole can be sustained for a few billion years by the energy output of a single star and emits an unambiguously artificial (continuous) gravitational wave signal that will be observable with LISA-type detectors.