Gravitational wave bursts from cosmic string cusps and pseudocusps

TY - JOUR

T1 - Gravitational wave bursts from cosmic string cusps and pseudocusps

AU - Stott, Matthew J.

AU - Elghozi, Thomas

AU - Sakellariadou, Mairi

PY - 2017/7

Y1 - 2017/7

N2 - We study the relative contribution of cusps and pseudocusps, on cosmic (super)strings, to the emitted bursts of gravitational waves. The gravitational wave emission in the vicinity of highly relativistic points on the string follows, for a high enough frequency, a logarithmic decrease. The slope has been analytically found to be -4/3 for points reaching exactly the speed of light in the limit c=1. We investigate the variations of this high-frequency behavior with respect to the velocity of the points considered, for strings formed through a numerical simulation, and we then compute numerically the gravitational waves emitted. We find that for string points moving with velocities as far as 10-3 from the theoretical (relativistic) limit c=1, gravitational wave emission follows a behavior consistent with that of cusps, effectively increasing the number of cusps on a string. Indeed, depending on the velocity threshold chosen for such behavior, we show that the emitting part of the string worldsheet is enhanced by a factor O(103) with respect to the emission of cusps only.

AB - We study the relative contribution of cusps and pseudocusps, on cosmic (super)strings, to the emitted bursts of gravitational waves. The gravitational wave emission in the vicinity of highly relativistic points on the string follows, for a high enough frequency, a logarithmic decrease. The slope has been analytically found to be -4/3 for points reaching exactly the speed of light in the limit c=1. We investigate the variations of this high-frequency behavior with respect to the velocity of the points considered, for strings formed through a numerical simulation, and we then compute numerically the gravitational waves emitted. We find that for string points moving with velocities as far as 10-3 from the theoretical (relativistic) limit c=1, gravitational wave emission follows a behavior consistent with that of cusps, effectively increasing the number of cusps on a string. Indeed, depending on the velocity threshold chosen for such behavior, we show that the emitting part of the string worldsheet is enhanced by a factor O(103) with respect to the emission of cusps only.

UR - https://www.scopus.com/pages/publications/85027057156

U2 - 10.1103/PhysRevD.96.023533

DO - 10.1103/PhysRevD.96.023533

M3 - Article

AN - SCOPUS:85027057156

SN - 2470-0010

VL - 96

JO - Physical Review D (Particles, Fields, Gravitation and Cosmology)

JF - Physical Review D (Particles, Fields, Gravitation and Cosmology)

IS - 2

M1 - 023533

ER -