Closed String Thermodynamics and a Blue Tensor Spectrum
  The BICEP-2 team has reported the detection of primordial cosmic microwave
background B-mode polarization, with hints of a suppression of power at large
angular scales relative to smaller scales. Provided that the B-mode
polarization is due to primordial gravitational waves, this might imply a blue
tilt of the primordial gravitational wave spectrum. Such a tilt would be
incompatible with standard inflationary models, although it was predicted some
years ago in the context of a mechanism that thermally generates the primordial
perturbations through a Hagedorn phase of string cosmology. The purpose of this
note is to encourage greater scrutiny of the data with priors informed by a
model that is immediately falsifiable, but which \textit{predicts} features
that might be favoured by the data-- namely a blue tensor tilt with an induced
and complimentary red tilt to the scalar spectrum, with a naturally large
tensor to scalar ratio that relates to both.
