  Making use of the wealth of new observational data coming from the sky it is
possible to constrain particle physics theories beyond the Standard Model. One
way to do this is illustrated in this article: a subset of theories admits
cosmic string solutions, topologically stable matter field configurations. In
these models, a network of cosmic strings inevitably forms in the early
universe and persists to the present time. The gravitational effects of these
strings leads to cosmological signatures which could be visible in current and
future data. The magnitude of these signatures increases as the energy scale of
the new physics involved in cosmic string formation increases. Thus, searching
for cosmological signatures of strings is a way to probe particle physics model
"from top down", as opposed to "from bottom up" as is done using data from
accelerators such as the Large Hadron Collider. Different ways of searching for
cosmic strings are illustrated in this article. They include Cosmic Microwave
Background temperature and polarization anisotropy maps, Large Scale Structure
optical and infrared surveys, and 21cm intensity maps.
