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Introduction to Strings and Branes by Peter West

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We now consider the sigma model approach to string theory and in particular how it gives rise to the IIA supergravity theory. This approach begins with the two-dimensional string action given by

images

(13.4.14)

where R(2) is the curvature scalar in two dimensions and +··· stands for terms containing fermions. This is just the string action we have discussed in earlier chapters, such as chapter 2, except that it is coupled to the fields Images, Aμν and σ, which are the metric, anti-symmetric tensor gauge field and dilaton which occur in the massless string ...

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