Cosmological Constant, Near Brane Behavior and Singularities

Gautason, Fridrik Freyr; Junghans, Daniel; Zagermann, Marco

doi:10.1007/JHEP09(2013)123

Cosmological Constant, Near Brane Behavior and Singularities

Fridrik Freyr Gautason
(
- Leibniz U., Hannover and
- QUEST, Hannover
)
,
Daniel Junghans
(
- QUEST, Hannover and
- Leibniz U., Hannover
)
,
Marco Zagermann
(
- Leibniz U., Hannover and
- QUEST, Hannover
)

Jan, 2013

33 pages

Published in:

JHEP 09 (2013) 123

Published: 2013

e-Print:

1301.5647 [hep-th]

DOI:

10.1007/JHEP09(2013)123

Report number:

ITP-UH-02-13

View in:

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Abstract: (arXiv)

We show that the classical cosmological constant in type II flux compactifications can be written as a sum of terms from the action of localized sources plus a specific contribution from non-trivial background fluxes. Exploiting two global scaling symmetries of the classical supergravity action, we find that the flux contribution can in many interesting cases be set to zero such that the cosmological constant is fully determined by the boundary conditions of the fields in the near-source region. This generalizes and makes more explicit previous arguments in the literature. We then discuss the problem of putting \bar{D3}-branes at the tip of the Klebanov-Strassler throat glued to a compact space in type IIB string theory so as to engineer a de Sitter solution. Our result for the cosmological constant and a simple global argument indicate that inserting a fully localized and backreacting \bar{D3}-brane into such a background yields a singular energy density for the NSNS and RR 3-form field strengths at the \bar{D3}-brane. This argument does not rely on partial smearing of the \bar{D3}-brane or a linearization of field equations, but on a few general assumptions that we also discuss carefully.

Note:

30 pages, no figures, v2: Minor modifications and references added. Version to appear in JHEP

Flux compactifications
dS vacua in string theory
D-branes
uperstring Vacua
compactification: flux
supergravity: action
symmetry: scaling
cosmological constant
background
boundary condition

References(49)

Figures(0)

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