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:20260802T012400Z UID:25295866-c3f6-4851-abde-32d64d3a7f5e SEQUENCE:1 CREATED:20260512T135840Z DESCRIPTION: Einstein-æther gravity is a Lorentz-violating extension of General Relativity in which a dynamical\, unit timelike vector field intro duces a preferred frame. I will give an overview of the theory\, covering new preliminary results on spherical collapse\, the emission of extra grav itational modes\, and post-Newtonian corrections to the two-body problem. Building on this theoretical framework\, I will then present quasi-strong- field constraints on the Einstein-æther coupling constants derived from h igh-precision timing of PSR J1738+0333. Our approach combines a full Bayes ian timing analysis with a resampling scheme that propagates posteriors on post-Keplerian parameters into theory-specific bounds on the fundamental coupling constants\, yielding the most stringent constraints from a single binary pulsar to date. The method is general and applicable to other alte rnative theories of gravity. LAST-MODIFIED:20260512T135840Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/en/events/preferred-frame-effects-in- gravity-theory-and-pulsar-timing-constraints/ X-ALT-DESC;FMTTYPE=text/html:

Einstein-æther g ravity is a Lorentz-violating extension of General Relativity in which a d ynamical\, unit timelike vector field introduces a preferred frame. I will give an overview of the theory\, covering new preliminary results on sphe rical collapse\, the emission of extra gravitational modes\, and post-Newt onian corrections to the two-body problem. Building on this theoretical fr amework\, I will then present quasi-strong-field constraints on the Einste in-æther coupling constants derived from high-precision timing of PSR J17 38+0333.

Our approach combines a full Bayesian timing analysis w ith a resampling scheme that propagates posteriors on post-Keplerian param eters into theory-specific bounds on the fundamental coupling constants\, yielding the most stringent constraints from a single binary pulsar to dat e. The method is general and applicable to other alternative theories of g ravity.

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