Comet Calendar, The Official Event Calendar for UT Dallas http://www.utdallas.edu/calendar/rss.php en-us This week's events for Natural Sciences & Mathematics at UT Dallas 2015 Annual Geophysical Consortium http://www.utdallas.edu/calendar/event.php?id=1220416405?WT.mc_id=CalendarRSS http://www.utdallas.edu/calendar/event.php?id=1220416405?WT.mc_id=CalendarRSS Monday, Mar 2 - Tuesday, Mar 3

The Geophysical Society presents its Annual Geophysical Consortium Meeting.  Formed in 1987, the University of Texas at Dallas Geophysical Consortium is an association of companies from the oil, service, and computer industries.  Every March, an annual meeting is held to present the ongoing research activities undertaken here at the Center for Lithospheric Studies (CLS) located at the University of Texas at Dallas.  This two day event is held for sponsors of research in exploration and reservoir geophysics at the CLS, and serves as a focal point for communication between industry professionals and researchers alike.  The annual meeting also facilitates the process of approaching practical research by finding out what the current industry needs are.

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Physics Colloquium: Effective Potentials and Morphological Transitions for Binary Black-Hole Spin Precession http://www.utdallas.edu/calendar/event.php?id=1220416988?WT.mc_id=CalendarRSS http://www.utdallas.edu/calendar/event.php?id=1220416988?WT.mc_id=CalendarRSS Wednesday, Mar 4
(4 p.m. - 5:15 p.m.)

Dr. Michael Kesden (UT Dallas)

     Generic binary black holes have spins that are misaligned with their orbital angular momentum.  I will use conservation of the total angular momentum and the projected effective spin on the precession time to derive an effective potential for BBH spin precession.  This effective potential allows us to solve the orbit-averaged spin-precession equations analytically for arbitrary mass ratios and spins.  These solutions are quasiperiodic functions of time: after a precessional period the spins return to their initial relative orientations.  We classify black-hole spin precession into three distinct morphologies between which the black holes can transition during their inspiral.  Our new solutions constitute fundamental progress in our understanding of black-hole spin precession and also have important applications to astrophysical black holes.  We derive a precession-averaged evolution equation that can be numerically integrated on the radiation-reaction time, allowing us to statistically track black-hole spins from formation to merger.  This will greatly help us predict the signatures of black-hole formation in the gravitational waves emitted near merger and the distributions of final spins and gravitational recoils.

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