O UNIVERSO DOS TÁQUIONS - Parte 12.9
Autor: Elyson Scafati | Publicado: 2013-12-26T12:08:00-02:00


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Os problemas das CTCs são os seguintes:



A CTC abre a
possibilidade de uma linha universal que não está conectada a tempos passados. &nbsp;Por isso, há ocorrência de acontecimentos que
não podem ser rastreados para uma causa anterior. Normalmente, a causalidade
exige que cada evento no espaço-tempo seja precedido por sua causa em cada um
dos quadros finais.



Este princípio
é fundamental para o determinismo , o que na linguagem da relatividade geral estatui
o conhecimento completo do universo em uma superfície de tipo espaço Cauchy que
pode ser usada para calcular o estado completo do resto do espaço-tempo.



No entanto,
numa CTC, a causalidade se quebra, porque um evento pode ser "simultaneo"
com a sua causa. Em certo sentido, um evento pode ser capaz de fazer com que se
cause a &nbsp;si mesmo. É impossível
determinar com base apenas no conhecimento do passado se algo existe ou não na CTC,
que possa interferir com outros objetos no espaço-tempo.



Por
conseguinte, uma CTC resulta num horizonte de Cauchy, que é uma região de
espaço-tempo que não pode ser prevista a partir de um conhecimento perfeito de
um tempo passado.



&nbsp;

 






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Nenhuma CTC pode
ser continuamente deformada, como partir de uma CTC até um ponto ( ou seja, uma
CTC e um ponto não são do tipo temporais homotópicas ), uma vez que esta
especialidade não seria causalmente bem comportada naquele ponto. A
característica topológica que impede a CTC de ser deformada até um ponto é
conhecida como um elemento topológicotipo temporal .



A existência de
CTCs impoõe restrições aos estados fisicamente permitidos de campos de
matéria-energia do universo. A propagação de uma configuração de campo ao longo
da família de curvas universais de tempo fechadas deve eventualmente resultar
no estado em que é idêntico ao original.&nbsp;



Este estado
original tem sido explorado por alguns cientistas como uma possível abordagem
para refutar a existência de CTCs .