BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Gravitational wave lensing: wave optics and GW231123 DTSTART:20260312T143000Z DTEND:20260312T160000Z DTSTAMP:20260805T235016Z UID:a6b639d9-3f7a-4338-92db-f13839b617b7 SEQUENCE:1 CREATED:20260310T122030Z DESCRIPTION: Light travelling through the Universe is deflected by the int ervening gravitational fields\, a phenomenon known as gravitational lensin g. This effect was an early prediction of General Relativity (GR) and it h as become an essential tool in astronomy. The existence of gravitational w aves was another prediction of GR\, but in this case we had to wait until 2015 for the first detection. Since then\, hundreds of events have been de tected in LVK\, a number that will increase significantly in the next obse rving run and with future detectors like LISA and the Einstein Telescope. This large number of detections guarantees the eventual observation of len sed gravitational waves. Similarly to light\, gravitational waves are affe cted by intervening matter\, but with some important differences\, e.g. th ey can experience diffraction. In this talk I will discuss the phenomenolo gy of gravitational wave lensing\, highlighting some key differences with light and focusing in the wave-optics regime. Finally\, I will cover the e xciting implications of the recently announced event GW231123\, which can be considered to be the first serious candidate for a lensed GW. LAST-MODIFIED:20260310T122030Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/en/events/gravitational-wave-lensing- wave-optics-and-gw231123/ X-ALT-DESC;FMTTYPE=text/html:

Light travelling t hrough the Universe is deflected by the intervening gravitational fields\, a phenomenon known as gravitational lensing. This effect was an early pre diction of General Relativity (GR) and it has become an essential tool in astronomy. The existence of gravitational waves was another prediction of GR\, but in this case we had to wait until 2015 for the first detection. < br/>
Since then\, hundreds of events have been detected in LVK\, a num ber that will increase significantly in the next observing run and with fu ture detectors like LISA and the Einstein Telescope. This large number of detections guarantees the eventual observation of lensed gravitational wav es.

Similarly to light\, gravitational waves are affected by int ervening matter\, but with some important differences\, e.g. they can expe rience diffraction. In this talk I will discuss the phenomenology of gravi tational wave lensing\, highlighting some key differences with light and f ocusing in the wave-optics regime. Finally\, I will cover the exciting imp lications of the recently announced event GW231123\, which can be consider ed to be the first serious candidate for a lensed GW.

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