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Recent BICEP2 detection of low-multipole B-mode polarization anisotropy inthe cosmic microwave background radiation supports the inflationary universescenario and suggests a large inflaton field range. The latter feature can beachieved with axion fields in the framework of string theory. We present such ahelical model which naturally becomes a model with a single cosine potential,and which in turn reduces to the (quadratic) chaotic inflation model in thesuper-Planckian limit. The slightly smaller tensor/scalar ratio $r$ of modelsof this type provides a signature of the periodic nature of an axion potential.We present a simple way to quantify this distinctive feature. As axions areintimately related to strings/vortices and strings are ubiquitous in stringtheory, we explore the possibility that cosmic strings may be contributing tothe B-mode polarization anisotropy observed.

Helical Inflation and Cosmic Strings