13,459 research outputs found
The GraviGUT Algebra Is not a Subalgebra of , but Does Contain an Extended GraviGUT Algebra
The (real) GraviGUT algebra is an extension of the
algebra by a -dimensional Lie algebra, but there is some ambiguity in the
literature about its definition. Recently, Lisi constructed an embedding of the
GraviGUT algebra into the quaternionic real form of . We clarify the
definition, showing that there is only one possibility, and then prove that the
GraviGUT algebra cannot be embedded into any real form of . We then modify
Lisi's construction to create true Lie algebra embeddings of the extended
GraviGUT algebra into . We classify these embeddings up to inner
automorphism
Probing Five-Dimensional Black Holes with D-Branes
We consider a one-brane probe in the presence of a five-dimensional black
hole in the classical limit. The velocity-dependent force on a slowly-moving
probe is characterized by a metric on the probe moduli space. This metric is
computed for large black holes using low-energy supergravity, and for small
black holes using D-brane gauge theory. The results are compared.Comment: 24 pages, harvma
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