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BEGIN:VEVENT
SUMMARY:Improved Binary Black Hole Initial Data
DTSTART:20241203T160000Z
DTEND:20241203T180000Z
DTSTAMP:20260425T042642Z
UID:9eb1a741-e65c-4b80-b127-e19a6e3e5610
SEQUENCE:1
CREATED:20241202T114401Z
DESCRIPTION: This thesis focuses on improving initial data for binary blac
 k hole simulations within numerical relativity. Currently\, the most commo
 n approach involves conformally flat initial data\, which successfully mod
 els the black holes but fails to capture the gravitational radiation. We r
 eproduce previous work that attempted to add radiative content to initial 
 data\, applying it to an excision code where constraints are solved.Using 
 the XCTS formalism\, we solve the constraint equations for binary black ho
 le initial data with radiative content derived from a Post-Newtonian appro
 ximation. We evolve a system with equal mass and large separation\, though
  computational limitations prevented evolution at smaller separations\, wh
 ere the radiation is relevant. By adjusting the inner zone metric\, it was
  possible to solve the constraints and evolve a system with smaller separa
 tion. We observed the expected gravitational radiation in early evolution.
  The findings suggest that initial data solutions for the constraint equat
 ions are sensitive to inner zone background data and boundary conditions\,
  affecting evolution outcomes. The results also indicate a strong effect o
 f resolution on the quality of the extracted gravitational wave forms.In u
 pcoming work\, we will explore the effects of the initial data radiative c
 ontent on the transition to evolution generated waves by running various t
 ests with high resolution. The results of this work will provide a better 
 understanding of the effects of initial data on the evolution of binary bl
 ack hole systems and the quality of the extracted gravitational wave forms
 .
LAST-MODIFIED:20241202T114401Z
LOCATION:Sala P3 Pavilhão de Matemática\, Piso 1
URL:http://df.vps.tecnico.ulisboa.pt/en/events/improved-binary-black-hole-
 initial-data/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="94khb"> This thesis focuse
 s on improving initial data for binary black hole simulations within numer
 ical relativity. Currently\, the most common approach involves conformally
  flat initial data\, which successfully models the black holes but fails t
 o capture the gravitational radiation. We reproduce previous work that att
 empted to add radiative content to initial data\, applying it to an excisi
 on code where constraints are solved.<br/><br/></p><p data-block-key="79ig
 c">Using the XCTS formalism\, we solve the constraint equations for binary
  black hole initial data with radiative content derived from a Post-Newton
 ian approximation. We evolve a system with equal mass and large separation
 \, though computational limitations prevented evolution at smaller separat
 ions\, where the radiation is relevant.<br/><br/> By adjusting the inner z
 one metric\, it was possible to solve the constraints and evolve a system 
 with smaller separation. We observed the expected gravitational radiation 
 in early evolution. The findings suggest that initial data solutions for t
 he constraint equations are sensitive to inner zone background data and bo
 undary conditions\, affecting evolution outcomes. The results also indicat
 e a strong effect of resolution on the quality of the extracted gravitatio
 nal wave forms.<br/><br/></p><p data-block-key="aiddj">In upcoming work\, 
 we will explore the effects of the initial data radiative content on the t
 ransition to evolution generated waves by running various tests with high 
 resolution. The results of this work will provide a better understanding o
 f the effects of initial data on the evolution of binary black hole system
 s and the quality of the extracted gravitational wave forms.</p>
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