CMB constraints on cosmic strings and superstrings
  We present the first complete Markov chain Monte Carlo analysis of
cosmological models with evolving cosmic (super)string networks, using the
unconnected segment model in the unequal-time correlator formalism. For
ordinary cosmic string networks, we derive joint constraints on Lambda cold
dark matter (CDM) and string network parameters, namely the string tension Gmu,
the loop-chopping efficiency c_r and the string wiggliness \alpha. For cosmic
superstrings, we obtain joint constraints on the fundamental string tension
Gmu_F, the string coupling g_s, the self-interaction coefficient c_s, and the
volume of compact extra dimensions w. This constitutes the most comprehensive
CMB analysis of LambdaCDM cosmology + strings to date. For ordinary cosmic
string networks our updated constraint on the string tension is, in
relativistic units, Gmu<1.1x10^-7, while for cosmic superstrings our constraint
on the fundamental string tension is Gmu_F<2.8x10^-8, both obtained using
Planck2015 temperature and polarisation data.
