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General axisymmetric solutions and self-tuning in 6D chiral gauged supergravity

Clifford P. Burgess1, Fernando Quevedo2, Gianmassimo Tasinato3 and Ivonne Zavala4

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We re-examine the properties of the axially-symmetric solutions to chiral gauged 6D supergravity, recently found in refs. [12] and [13]. Ref. [12] finds the most general solutions having two singularities which are maximally-symmetric in the large 4 dimensions and which are axially-symmetric in the internal dimensions. We show that not all of these solutions have purely conical singularities at the brane positions, and that not all singularities can be interpreted as being the bulk geometry sourced by neutral 3-branes. The subset of solutions for which the metric singularities are conical precisely agree with the solutions of ref. [13]. Establishing this connection between the solutions of these two references resolves a minor conflict concerning whether or not the tensions of the resulting branes must be negative. The tensions can be both negative and positive depending on the choice of parameters. We discuss the physical interpretation of the non-conical solutions, including their significance for the proposal for using 6-dimensional self-tuning to understand the small size of the observed vacuum energy. In passing we briefly comment on a recent paper by Garriga and Porrati which criticizes the realization of self-tuning in 6D supergravity.


Keywords

p-branes

Extra Large Dimensions

Supergravity Models

 

E-print Number: hep-th/0408109

Cited: by |

Refers: to

PACS

11.27.+d Extended classical solutions; cosmic strings, domain walls, texture

11.25.Wx String and brane phenomenology

11.10.Kk Field theories in dimensions other than four

04.65.+e Supergravity

Subjects

Gravitation and cosmology

Particle physics and field theory

Dates

Issue 11 (November 2004)

Received 6 September 2004, accepted for publication 24 November 2004

Published 15 December 2004



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