Type-IIB orientifolds without untwisted tadpoles, and non-BPS D-branes

被引:0
作者
Rabadán, R
Uranga, AM
机构
[1] Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain
[2] CERN, Div Theory, CH-1211 Geneva 23, Switzerland
来源
JOURNAL OF HIGH ENERGY PHYSICS | 2001年 / 01期
关键词
superstrings and heterotic strings; D-branes; superstring vacua;
D O I
暂无
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We discuss the construction of six- and four-dimensional type-IIB orientifolds with vanishing untwisted RR tadpoles, but generically non-zero twisted RR tadpoles. Tadpole cancellation requires the introduction of D-brane systems with zero untwisted RR charge, but non-zero twisted RR charges. We construct explicit models containing branes and antibranes at fixed points of the internal space, or non-BPS branes partially wrapped on it. The models are non-supersymmetric, but are absolutely stable against decay to supersymmetric vacua. For particular values of the compactification radii tachyonic modes may develop, triggering phase transitions between the different types of non-BPS configurations of branes, which we study in detail in a particular example. As an interesting spin-off, we show that the T-6/Z(4) orientifold without vector structure, previously considered inconsistent due to uncancelable twisted tadpoles, can actually be made consistent by introducing a set of brane-antibrane pairs whose twisted charge cancels the problematic tadpole.
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页数:34
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