Abstract
We study a family of classical strings on 
× S3 subspace of the AdS5 × S5 background that
interpolates between pulsating strings and single-spike strings.
They are obtained from the helical strings of hep-th/0609026
by interchanging worldsheet time and space coordinates, which maps rotating/spinning string states with large
spins to oscillating states with large winding numbers. From a
finite-gap perspective, this transformation is realised as an
interchange of quasi-momentum and quasi-energy defined for the
algebraic curve. The gauge theory duals are also discussed, and
are identified with operators in the non-holomorphic sector of
= 4 super Yang-Mills. They can be viewed as excited
states above the ``antiferromagnetic'' state, which is ``as far
from BPS as possible'' in the spin-chain spectrum. Furthermore, we
investigate helical strings on AdS3 × S1 in an
appendix.
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