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Disertasi S3 : Higher dimensional defects in cosmology
Oleh : Handhika Satrio Ramadhan
Sabtu, 16 Juli 2011 (00:54 WIB) dari IP 126.96.36.199
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Higher dimensional defects in cosmology
Handhika Satrio Ramadhan
Extra dimensions seem to be an important ingredient for uniﬁcation of gravity with quantum ﬁeld theory. Our best candidate of quantum gravity, superstring theory, requires ten-dimensional space-time for mathematical con- sistency. However, since our world appears four-dimensional there must be a mechanism that “hides” extra dimensions so that we do not experience them at low energy scale. There are several methods in literature for concealing extra dimensions from our naked eye. In this thesis we only focus on two of them: braneworld scenario and ﬂux compactiﬁcation, both of which require the existence of the bulk ﬁelds. This thesis investigates the role topological defects can play as bulk ﬁelds in higher-dimensional cosmology with diﬀerent asymptotic topology. The ﬁrst part deals with the non-singular braneworld: Skyrme branes and its higher- dimensional generalizations. We show how these defects regularize the naked singularity around the core while at the same time approach the same ﬂat- asymptotic behavior as the known thin-wall solutions. The second part is devoted to study an exotic transition, tunneling to (and from) nothing, in a landscape where the space-time vacua are direct products of X4 × S2 , with X4 can be: anti-de Sitter (AdS4 ), Minkowski (M4 ), or de Sitter (dS4 ). The tunneling is mediated by instanton solutions, via bubble nucleation. The bubble wall is smooth and magnetically-charged, and we show that this can be accomplished by having solitonic brane possessing magnetic charge, i.e., magnetic-monopole branes.
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