Observational constraints on the types of cosmic strings
  This paper is aimed at setting observational limits to the number of cosmic
strings (Nambu-Goto, Abelian-Higgs, semilocal) and other topological defects
(textures). Radio maps of CMB anisotropy, provided by the space mission Planck
for various frequencies, were filtered and then processed by the method of
convolution with modified Haar functions (MHF) to search for cosmic string
candidates. This method was designed to search for solitary strings, without
additional assumptions about the presence of networks of such objects. The
sensitivity of the MHF method is $\delta T \approx 10 \mu K$ in a background of
$\delta T \approx 100 \mu K$. The comparison of these with previously known
results on search string network shows that strings can only be semilocal in an
amount of $1 \div 5$, with the upper restriction on individual strings tension
(linear density) of $G\mu/c^2 \le 7.36 \cdot 10^{-7}$. The texture model is
also legal. There are no strings with $G\mu/c^2 > 7.36 \cdot 10^{-7}$. However,
comparison with the data for the search of non-Gaussian signals shows that the
presence of several (up to 3) of Nambu-Goto strings is also possible. For
$G\mu/c^2 \le 4.83 \cdot 10^{-7}$ the MHF method is ineffective because of
unverifiable spurious string candidates. Thus the existence of strings with
tensions $G\mu/c^2 \le 4.83 \cdot 10^{-7}$ is not prohibited but it is beyond
the Planck data possibilities.
