BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Preferred-Frame Effects in Gravity: Theory and Pulsar Timing Const raints DTSTART:20260514T143000Z DTEND:20260514T160000Z DTSTAMP:20260725T033902Z UID:25295866-c3f6-4851-abde-32d64d3a7f5e SEQUENCE:2 CREATED:20260512T135849Z DESCRIPTION:Einstein-æther gravity is a Lorentz-violating extension of Ge neral Relativity in which a dynamical\, unit timelike vector field introdu ces a preferred frame. I will give an overview of the theory\, covering ne w preliminary results on spherical collapse\, the emission of extra gravit ational modes\, and post-Newtonian corrections to the two-body problem. Bu ilding on this theoretical framework\, I will then present quasi-strong-fi eld constraints on the Einstein-æther coupling constants derived from hig h-precision timing of PSR J1738+0333. Our approach combines a full Bayesia n timing analysis with a resampling scheme that propagates posteriors on p ost-Keplerian parameters into theory-specific bounds on the fundamental co upling constants\, yielding the most stringent constraints from a single b inary pulsar to date. The method is general and applicable to other altern ative theories of gravity. LAST-MODIFIED:20260512T135858Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/preferred-frame-effects-in -gravity-theory-and-pulsar-timing-constraints/ X-ALT-DESC;FMTTYPE=text/html:

Einstein-æther gra vity is a Lorentz-violating extension of General Relativity in which a dyn amical\, unit timelike vector field introduces a preferred frame. I will g ive an overview of the theory\, covering new preliminary results on spheri cal collapse\, the emission of extra gravitational modes\, and post-Newton ian corrections to the two-body problem. Building on this theoretical fram ework\, I will then present quasi-strong-field constraints on the Einstein -æther coupling constants derived from high-precision timing of PSR J1738 +0333.

Our approach combines a full Bayesian timing analysis wit h a resampling scheme that propagates posteriors on post-Keplerian paramet ers into theory-specific bounds on the fundamental coupling constants\, yi elding the most stringent constraints from a single binary pulsar to date. The method is general and applicable to other alternative theories of gra vity.

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