Beyond the Standard Models with cosmic strings
By Y. Gouttenoire, G. Servant, P. Simakachorn. Journal of Cosmology and Astroparticle Physics, 2019
177 citations recorded by the source corpus.
We examine which information on the early cosmological history can be extracted from the potential measurement by third-generation gravitational-wave observatories of a stochastic gravitational wave background (SGWB) produced by cosmic strings. We consider a variety of cosmological scenarios breaking the scale-invariant properties of the spectrum, such as early long matter or kination eras, short intermediate matter and inflation periods inside a radiation era, and their specific signatures on the SGWB . This requires to go beyond the usually-assumed scaling regime, to take into account the transient effects during the change of equation of state of the universe. We compute the time evolution of the string network parameters and thus the loop-production efficiency during the transient regime, and derive the corresponding shift in the turning-point frequency. We consider the impact of particle production on the gravitational-wave emission by loops. We estimate the reach of future interferometers LISA, BBO, DECIGO, ET and CE and radio telescope SKA to probe the new physics energy scale at which the universe has experienced changes in its expansion history. We find that a given interferometer may be sensitive to very different energy scales, depending on the nature and duration of the non-standard era, and the value of the string tension. It is fascinating that by exploiting the data from different GW observatories associated with distinct frequency bands, we may be able to reconstruct the full spectrum and therefore extract the values of fundamental physics parameters.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/599790a2f4ad6addeabf69cc9decde1d3e070ba5
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Citations in the corpus
- From NANOGrav to LIGO with metastable cosmic strings (2020, background): “[22] by resumming the first 20,000 modes and taking into account the changes in the number of effective degrees of freedom in the thermal bath (see also [33]).”
- Baryogenesis from the weak scale to the grand unification scale (2020, methodology): “A larger frequency f∗ was obtained by Gouttenoire, Servant, and Simakachorn (2020).”
- Challenges and opportunities of gravitational-wave searches at MHz to GHz frequencies (2020, unknown): “Therefore the detection of the cosmic gravitational microwave background corresponding to Tmax [ 1016 GeV would rule out slow-roll inflation as a viable pre hot Big Bang scenario.”