BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Relativistic Dynamical System and Gravitational Waves DTSTART:20221124T143000Z DTEND:20221124T163000Z DTSTAMP:20260624T112024Z UID:46f2a890-4701-431d-a0d2-d230c05e433d SEQUENCE:3 CREATED:20221118T153220Z DESCRIPTION:Abstract:After the discovery of the gravitational waves\, grav itational wave physics and astronomy have provided us new information abou t strong gravitational phenomena and new physics. For example\, speed of g ravitational waves\, equation of state at very high dense regions\, constr aint on gravitational theories\, and so on.In order to observe gravitation al waves\, we have used the templates of emitted gravitational waves from a binary system. However\, we may have a more complicated relativistic dyn amical system in nature\, which may not be integrable. We may expect chaot ic behavior in such a system\, for which it is very difficult to make appr opriate templates.In this talk\, we study chaos in a relativistic dynamica l system of compact objects and the gravitational waves emitted from such a system. We then look for some characteristic features of the gravitation al waves\, which could be used in gravitational wave observation.We also d iscuss a hierarchical triple system with the Kozai-Lidov mechanism\, which shows the oscillation between the eccentricity of inner binary and relati ve inclination. The evolution curve of the cumulative perihelion shift\, w hich is indirect evidence of gravitational wave emission\, will be bent si nce the gravitational waves are emitted strongly when the eccentricity bec omes large. We then show the observability of gravitational waves from suc h a triple system. We also consider relativistic effects such as Lense-Thi rring precession. LAST-MODIFIED:20221118T153821Z LOCATION:Sala de Seminários do DF\, Pavilhão de Física\, 2º piso URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/relativistic-dynamical-sys tem-and-gravitational-waves/ X-ALT-DESC;FMTTYPE=text/html:

Abstract:
After the discovery of the gravitational waves\, gravitational wave physics and astronomy have provided us new information about strong gravitational phe nomena and new physics. For example\, speed of gravitational waves\, equat ion of state at very high dense regions\, constraint on gravitational theo ries\, and so on.

In order to observe gravitational waves\, we ha ve used the templates of emitted gravitational waves from a binary system. However\, we may have a more complicated relativistic dynamical system in nature\, which may not be integrable. We may expect chaotic behavior in s uch a system\, for which it is very difficult to make appropriate template s.

In this talk\, we study chaos in a relativistic dynamical syst em of compact objects and the gravitational waves emitted from such a syst em. We then look for some characteristic features of the gravitational wav es\, which could be used in gravitational wave observation.

We al so discuss a hierarchical triple system with the Kozai-Lidov mechanism\, w hich shows the oscillation between the eccentricity of inner binary and re lative inclination. The evolution curve of the cumulative perihelion shift \, which is indirect evidence of gravitational wave emission\, will be ben t since the gravitational waves are emitted strongly when the eccentricity becomes large. We then show the observability of gravitational waves from such a triple system. We also consider relativistic effects such as Lense -Thirring precession.

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