For strongly coupled local cosmic strings with m_v/m_s ~ 1, the Nambu-Goto gravitational wave spectrum deviates substantially from lattice field theory, while agreement holds for near-global and weakly coupled strings.
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Testing Nambu-Goto approximation of cosmic string by lattice field simulations
For strongly coupled local cosmic strings with m_v/m_s ~ 1, the Nambu-Goto gravitational wave spectrum deviates substantially from lattice field theory, while agreement holds for near-global and weakly coupled strings.