D0-brane tension in string field theory

Details D0-brane tension in string field theory D0-brane tension in string field theory

2005-08-12

arxiv.org/abs/hep-th/0508090v1

JHEP 0509 (2005) 021

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, 3 Eps figures

Scientific paper

10.1088/1126-6708/2005/09/021

We compute the D0-brane tension in string field theory by representing it as a tachyon lump of the D1-brane compactified on a circle of radius $R$. To this aim, we calculate the lump solution in level truncation up to level L=8. The normalized D0-brane tension is independent on $R$. The compactification radius is therefore chosen in order to cancel the subleading correction $1/L^2$. We show that an optimal radius $R^*$ indeed exists and that at $R^*$ the theoretical prediction for the tension is reproduced at the level of $10^{-5}$. As a byproduct of our calculation we also discuss the determination of the marginal tachyon field at $R\to 1$.

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