Gravitational waves from cosmic strings in LISA: reconstruction pipeline and physics interpretation
Jose J. Blanco-Pillado (for the LISA Cosmology Working Group), Yanou Cui (for the LISA Cosmology Working Group), Sachiko Kuroyanagi (for the LISA Cosmology Working Group), Marek Lewicki (for the LISA Cosmology Working Group), Germano Nardini (for the LISA Cosmology Working Group), Mauro Pieroni (for the LISA Cosmology Working Group), Ivan Yu. Rybak (for the LISA Cosmology Working Group), Lara Sousa (for the LISA Cosmology Working Group), Jeremy M. Wachter (for the LISA Cosmology Working Group)
arXiv:2405.03740v1 Announce Type: new
Abstract: We initiate the LISA template databank for stochastic gravitational wave backgrounds sourced by cosmic strings. We include two templates, an analytical template, which enables more flexible searches, and a numerical template derived directly from large Nambu-Goto simulations of string networks. Using searches based on these templates, we forecast the parameter space within the reach of the experiment and the precision with which their parameters will be reconstructed, provided a signal is observed. The reconstruction permits probing the Hubble expansion and new relativistic DoF in the early universe. We quantify the impact that astrophysical foregrounds can have on these searches. Finally, we discuss the impact that these observations would have on our understanding of the fundamental models behind the string networks. Overall, we prove that LISA has great potential for probing cosmic string models and may reach tensions as low as $Gmu =10^{-16} – 10^{-17} $, which translates into energy scales of the order $10^{11}~text{GeV}$.arXiv:2405.03740v1 Announce Type: new
Abstract: We initiate the LISA template databank for stochastic gravitational wave backgrounds sourced by cosmic strings. We include two templates, an analytical template, which enables more flexible searches, and a numerical template derived directly from large Nambu-Goto simulations of string networks. Using searches based on these templates, we forecast the parameter space within the reach of the experiment and the precision with which their parameters will be reconstructed, provided a signal is observed. The reconstruction permits probing the Hubble expansion and new relativistic DoF in the early universe. We quantify the impact that astrophysical foregrounds can have on these searches. Finally, we discuss the impact that these observations would have on our understanding of the fundamental models behind the string networks. Overall, we prove that LISA has great potential for probing cosmic string models and may reach tensions as low as $Gmu =10^{-16} – 10^{-17} $, which translates into energy scales of the order $10^{11}~text{GeV}$.

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