Speaker
Heejoo Kim
(KAIST)
Description
Global cosmic string simulation is revisited on the lattice of the size of 4096^3. The simulation result supports the recently observed logarithmic growth in both the string number density and the power-law spectral index for the instantaneous axion emission spectra from string. It is found that these results stay robust against various simulation setups differing by the initial conditions and whether the field is thermal or not. A possible correlation between the spectral index and the string number density is discussed as well. Additionally, a new novel string identification method is introduced, which guarantees the connectedness of the strings and provides a convenient way of assigning core location.