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:20260802T190706Z UID:a6b639d9-3f7a-4338-92db-f13839b617b7 SEQUENCE:2 CREATED:20260310T122039Z DESCRIPTION:Light travelling through the Universe is deflected by the inte rvening gravitational fields\, a phenomenon known as gravitational lensing . This effect was an early prediction of General Relativity (GR) and it ha s become an essential tool in astronomy. The existence of gravitational wa ves was another prediction of GR\, but in this case we had to wait until 2 015 for the first detection. Since then\, hundreds of events have been det ected in LVK\, a number that will increase significantly in the next obser ving run and with future detectors like LISA and the Einstein Telescope. T his large number of detections guarantees the eventual observation of lens ed gravitational waves. Similarly to light\, gravitational waves are affec ted by intervening matter\, but with some important differences\, e.g. the y can experience diffraction. In this talk I will discuss the phenomenolog y of gravitational wave lensing\, highlighting some key differences with l ight and focusing in the wave-optics regime. Finally\, I will cover the ex citing implications of the recently announced event GW231123\, which can b e considered to be the first serious candidate for a lensed GW. LAST-MODIFIED:20260310T122047Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/gravitational-wave-lensing -wave-optics-and-gw231123/ X-ALT-DESC;FMTTYPE=text/html:

Light travelling th rough the Universe is deflected by the intervening gravitational fields\, a phenomenon known as gravitational lensing. This effect was an early pred iction of General Relativity (GR) and it has become an essential tool in a stronomy. The existence of gravitational waves was another prediction of G R\, but in this case we had to wait until 2015 for the first detection.

Since then\, hundreds of events have been detected in LVK\, a numb er that will increase significantly in the next observing run and with fut ure detectors like LISA and the Einstein Telescope. This large number of d etections guarantees the eventual observation of lensed gravitational wave s.

Similarly to light\, gravitational waves are affected by inte rvening matter\, but with some important differences\, e.g. they can exper ience diffraction. In this talk I will discuss the phenomenology of gravit ational wave lensing\, highlighting some key differences with light and fo cusing in the wave-optics regime. Finally\, I will cover the exciting impl ications of the recently announced event GW231123\, which can be considere d to be the first serious candidate for a lensed GW.

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