1211.5587 (Michael C. Abbott)

Comment on Strings in AdS3 x S3 x S3 x S1 at One Loop    [PDF]

Michael C. Abbott

This paper studies semiclassical strings in AdS3 x S3 x S3 x S1 using the algebraic curve. Calculating one-loop corrections to the energy of the giant magnon fixes the constant term c in the expansion of the coupling h(\lambda). Comparing these to similar corrections for long spinning strings gives a prediction for the one-loop term f1 in the expansion of the cusp anomalous dimension f(h), for all \alpha (where \alpha --> 1 is the AdS3 x S3 x T4 limit). For these semiclassical mode sums there is a similar choice of regularisation prescriptions to that encountered in AdS4 x CP3. However at \alpha \neq 1/2 they lead to different values of f1 and are therefore not related by a simple change of the coupling. The algebraic curve is also used to calculate various finite-size corrections for giant magnons, which are well-behaved as \alpha --> 1.

View original: http://arxiv.org/abs/1211.5587