GRAVITATIONAL RADIATION FROM REALISTIC COSMIC STRING LOOPS

Abstract

We examine the rates at which energy and momentum are radiated into gravitational waves by a large set of realistic cosmic string loops. The string loops are generated by numerically evolving parent loops with different initial conditions forward in time until they self-intersect, fragmenting into two child loops. The fragmentation of the child loops is followed recursively until only non-self-intersecting loops remain. The properties of the final non-self-intersecting loops are found to be independent of the initial conditions of the parent loops. We have calculated the radiated energy and momentum for a total of 11,625 stable child loops. We find that the majority of the final loops do not radiate significant amounts of spatial momentum. The velocity gained due to the rocket effect is typically small compared to the center-of-mass velocity of the fragmented loops. The distribution of gravitational radiation rates in the center of mass frame of the loops, ${\gamma }^0\equiv (G{\mu }^2{)}^{-1}\Delta E/\Delta \tau$, is strongly peaked in the range ${\gamma }^0=45-55$, however there are no loops found with ${\gamma }^0<40$. Because the radiated spatial momentum is small, the distribution of gravitational radiation rates appears roughly the same in any reference frame. We conjecture that in the center-of-mass frame there is a lower bound ${\gamma }_{\min }^0>0$ for the radiation rate from cosmic string loops. In a second conjecture, we identify a candidate for the loop with the minimal radiation rate and suggest that ${\gamma }_{\min }^0\cong 39.003$.

Tarred, gzipped, and uuencoded using uufiles. 15 pages plus 29 figures

References in corpus (3)

• A Closed-Form Expression for the Gravitational Radiation Rate from Cosmic Strings
• Analytic Results for the Gravitational Radiation from a Class of Cosmic String Loops
• Closed Form Expression for the Momentum Radiated from Cosmic String Loops

Cited by in corpus (20)

• Cosmological Backgrounds of Gravitational Waves
• Placing limits on the stochastic gravitational-wave background using European Pulsar Timing Array data
• Constraints on cosmic string tension imposed by the limit on the stochastic gravitational wave background from the European Pulsar Timing Array
• Constraints on cosmic strings using data from the first Advanced LIGO observing run
• Relic Gravitational Waves from Cosmic Strings: Updated Constraints and Opportunities for Detection
• Formation of Black Holes from Collapsed Cosmic String Loops
• Tensor Perturbations in Quantum Cosmological Backgrounds
• Cosmic string scaling in flat space
• Probing Cosmic Superstrings with Gravitational Waves
• Monopoles, strings and dark matter
• CMB Distortions from Damping of Acoustic Waves Produced by Cosmic Strings
• Magnetogenesis from Cosmic String Loops
• Coherent Gravitational Waveforms and Memory from Cosmic String Loops
• The Wouthuysen Field Absorption Trough in Cosmic Strings Wakes
• Gravitational backreaction on a cosmic string: Formalism
• Shape of Cosmic String Loops
• Does a Nambu-Goto wall emit gravitational waves? -- Cylindrical Nambu-Goto wall as an example of gravitating non-spherical walls --
• Initial condition of a thick loop cosmic string and linear perturbations
• The cusp properties of High Harmonic Loops
• Breaking the Strings: the signatures of Cosmic String Loop Fragmentation