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SUMMARY:The Weiss variation in gravitation theory
DTSTART:20221027T143000Z
DTEND:20221027T163000Z
DTSTAMP:20260804T011959Z
UID:d5de3b18-5a54-469a-bd3a-805fa5d086f9
SEQUENCE:1
CREATED:20221024T144651Z
DESCRIPTION: Abstract:The Weiss variation formalism in mechanics and class
 ical field theory concerns action variations that include explicit endpoin
 t/boundary displacements. The Weiss variation is useful in field theory be
 cause it can be used to obtain expressions for the conjugate momenta and H
 amiltonian without performing an explicit 3+1 decomposition beforehand. In
  this talk\, I review the Weiss variation in mechanics\, classical field t
 heory\, and in gravitation. In general relativity\, one can recover (by wa
 y of an auxiliary connection formalism) a tensorial generalization of the 
 Einstein canonical energy-momentum pseudotensor\, as well as a reference-d
 ependent Hamiltonian. In addition to discussing the Weiss variation in gen
 eral relativity\, I comment on some applications of the Weiss variation fo
 rmalism for modified gravity theories. 
LAST-MODIFIED:20221024T144651Z
LOCATION:Sala de Seminários do DF\,  Pavilhão de Física\, 2º piso
URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/the-weiss-variation-in-gra
 vitation-theory/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="vrpjx"><b> Abstract:</b><b
 r/>The Weiss variation formalism in mechanics and classical field theory c
 oncerns action variations that include explicit endpoint/boundary displace
 ments. The Weiss variation is useful in field theory because it can be use
 d to obtain expressions for the conjugate momenta and Hamiltonian without 
 performing an explicit 3+1 decomposition beforehand. In this talk\, I revi
 ew the Weiss variation in mechanics\, classical field theory\, and in grav
 itation. <br/><br/>In general relativity\, one can recover (by way of an a
 uxiliary connection formalism) a tensorial generalization of the Einstein 
 canonical energy-momentum pseudotensor\, as well as a reference-dependent 
 Hamiltonian. In addition to discussing the Weiss variation in general rela
 tivity\, I comment on some applications of the Weiss variation formalism f
 or modified gravity theories. </p>
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