XIII Encontro Nacional de FÃÂsica de PartÃÂculas e Campos.pdf
XIII Encontro Nacional de FÃÂsica de PartÃÂculas e Campos.pdf
XIII Encontro Nacional de FÃÂsica de PartÃÂculas e Campos.pdf
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17/9 - 16:40<br />
Deflationary Cosmology with Vacuum<br />
Decaying Energy Density<br />
J. A. S. Lima and J. M. F. Mafia<br />
Departamento<br />
tJFRN<br />
59072-970 Natal RN - Brazil<br />
Abstract<br />
A nonsingular cosmological scenario based on a new phenomenological<br />
<strong>de</strong>cay law for the effective A-termis proposed. In such a mo<strong>de</strong>l,<br />
the cosmological history began from an instability of the <strong>de</strong> Sitter<br />
spaccti me, rather than a singularity. Subsequently, the universe evolved<br />
coutinously towards a slightly modified Friedmann-Robertson-Walker<br />
(FRW) cosmology. Among the "remnants" of the inflationary period<br />
arc the present values of the cosmological term (A 0 - 30//j)<br />
and the <strong>de</strong>nsity parameter (II 1 - 0), where the dimensionless free<br />
parameter 0 is smaller than unit. In addition, the age of the matterdominated<br />
phase is greater than-.147 1 and the-present.matter creation .<br />
3)311,T 1 is smaller than the one arising in Hoyle's steady state<br />
rate<br />
version.<br />
17/9 — 16:55<br />
CLASSIFICAck0 DE CAMPOS , ESCALARES NA RELATIVIDADE GERAL<br />
J. Santos (UFRN), M.J. Reboucas (CBPF), A.F.F. Teixeira (CBPF)<br />
Foi feita a classifica4ao algebrica para o tensor energia-momento <strong>de</strong> um<br />
campo escalar minimamente acoplado a gravitacao. A partir <strong>de</strong> consi<strong>de</strong>raciies<br />
sobre o carater vetorial do gradiente do campo, obteve-se quatro diferentes -<br />
tipos <strong>de</strong> Segre relacionados a quatro possiveis formas canOnicas , para o campo<br />
escalar. Apresentamos soittcaes das equagoes <strong>de</strong> Einstein para cads forma cam?)<br />
nica obtida.<br />
17/9 - 17:30<br />
RELATIVIDADE NUMERICA: coNnigfts INICIAIS PARA COLISAO<br />
DE' DOIS<br />
BURACOS NEGROS<br />
Samuel Rocha <strong>de</strong> Oliveira<br />
Universida<strong>de</strong> <strong>de</strong> Brasilia<br />
Resolve-se numericamente<br />
para a co lisao <strong>de</strong> dois buracos negro<br />
o formali smo conforms <strong>de</strong> Ydrk.et al.<br />
universos conectados por "buracos <strong>de</strong><br />
vinculos. Tem-se que resolver numeri<br />
nao linea r com condiq;es <strong>de</strong> contorno<br />
empregado com relativo sucesso para<br />
metodo s3 o discutidos em <strong>de</strong>talhe por<br />
Computaci onal.<br />
as equagaes <strong>de</strong> vinculo dos dados iniciais<br />
s em configuracaes 3-dimensionais. Usam-Se<br />
e condic;es <strong>de</strong> isOmetria entre dois<br />
minhoca" para simplificar as equaqaes <strong>de</strong><br />
camente entao uma equaga .o parcial eliptica<br />
mistas. 0 metodo <strong>de</strong> Multiquadric foi<br />
este fim. Vantagens e <strong>de</strong>svantagens do<br />
se trstar <strong>de</strong> uma tecnica nova em Fisica<br />
-47-
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