Number of cosmic string loops

作者：Blanco Pillado Jose J^*; Olum Ken D; Shlaer Benjamin

来源：PHYSICAL REVIEW D, 2014, 89(2): 023512.

DOI：10.1103/PhysRevD.89.023512

Using recent simulation results, we provide the mass and speed spectrum of cosmic string loops. This is the quantity of primary interest for many phenomenological signatures of cosmic strings, and it can be accurately predicted using recently acquired detailed knowledge of the loop production function. We emphasize that gravitational smoothing of long strings plays a negligible role in determining the total number of existing loops. We derive a bound on the string tension imposed by recent constraints on the stochastic gravitational wave background from pulsar timing arrays, finding G mu %26lt;= 2.8 x 10(-9). We also provide a derivation of the Boltzmann equation for cosmic string loops in the language of differential forms.

• 出版日期2014-1-14