Gravitational waves from cosmic strings in LISA: reconstruction pipeline and physics interpretation

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Preprint
Report number	arXiv:2405.03740 ; LISA-COSWG-24-02 ; CERN-TH-2024-085
Title	Gravitational waves from cosmic strings in LISA: reconstruction pipeline and physics interpretation
Author(s)	Blanco-Pillado, Jose J. (IKERBASQUE, Bilbao ; Basque U., Bilbao ; U. Basque Country, Leioa) ; Cui, Yanou (UC, Riverside) ; Kuroyanagi, Sachiko (Madrid, IFT ; Nagoya U.) ; Lewicki, Marek (Warsaw U.) ; Nardini, Germano (Stavanger U.) ; Pieroni, Mauro (CERN) ; Rybak, Ivan Yu. (Zaragoza U. ; Porto U., Astron. Dept.) ; Sousa, Lara (Porto U., Astron. Dept.) ; Wachter, Jeremy M. (Wentworth Inst. Tech.)
Collaboration	LISA Cosmology Working Group Collaboration
Imprint	2024-05-06
Number of pages	61
Note	59 pages, 15 figures
Subject category	hep-th ; Particle Physics - Theory ; gr-qc ; General Relativity and Cosmology ; astro-ph.CO ; Astrophysics and Astronomy
Accelerator/Facility, Experiment	LISA
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 $G\mu =10^{-16} - 10^{-17} $, which translates into energy scales of the order $10^{11} \text{GeV}$.
Other source	Inspire
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0)

$\includegraphics[width = 0.2 \textwidth]{preprintLOGO_cs_parameter_reconstruction.png}$ $Analytical template for Model I for different values of the free parameters of the model. The gray shaded area represents the LISA power law sensitivity window. The top left panel displays the SGWB for different values of cosmic string tension $G\mu$, for $\alpha=10^{-1}$ and $q=4/3$. The top right panel shows the effects of varying the loop-size parameter $\alpha$, for $G\mu=10^{-10}$ and $q=4/3$. The spectra for different values of the spectral index $q$ for $G\mu=10^{-14}$ and $\alpha=10^{-1}$ is displayed in the bottom panel.$ $Examples of the full SGWB spectrum generated by cosmic strings in modified pre-BBN scenarios. The dashed lines represent the spectra generated by cosmic string evolving according to the SM of Cosmology and assuming the particle content of the SM of Particle Physics. Here we took $G\mu=10^{-10}$, $\alpha=10^{-1}$, $q=4/3$ and $\mathcal{F}=0.1$, and the shaded area corresponds to the LISA power-law sensitivity window. The left panel displays the results for various benchmark scenarios in which the universe underwent a period with a modified equation of state $w$ before the recent radiation dominated era, starting at $T_{\rm rd}=1\, \rm GeV$ (represented by the colored solid lines). The right panel shows the results with various benchmark numbers of new relativistic DoF, $\Delta g_*$, that decouple around $T_\Delta= 10\, \rm MeV$ (the colored solid lines).$ Show more plots

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Záznam vytvorený 2024-06-11, zmenený 2024-07-02

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