Gravitational shine of dark domain walls
From MaRDI portal
Publication:5099255
DOI10.1088/1475-7516/2022/04/028zbMATH Open1506.83022arXiv2112.12608OpenAlexW4224243180MaRDI QIDQ5099255
Author name not available (Why is that?)
Publication date: 31 August 2022
Published in: (Search for Journal in Brave)
Abstract: Cosmic domain walls are harmless, provided that their tension decreases with expansion of the Universe. This setup can be realized, if the scale of spontaneous symmetry breaking is induced dynamically through the interaction with hot primordial plasma. In that case, the domain wall tension can attain large values in the early Universe without any conflict with observations. Owing to the large initial tension, these topological defects may serve as a powerful source of gravitational waves. We make a preliminary estimate of the gravitational wave spectrum and argue that it is distinct from the spectrum produced by other sources, in particular by domain walls of a constant tension. The resulting gravitational wave signal is in the range accessible by Einstein Telescope, DECIGO, TianQin, LISA, IPTA, or SKA, if the field constituting the domain walls is very feebly coupled with hot primordial plasma and has tiny self-interactions. In particular, one can consider this field for the role of Dark Matter. We discuss various Dark Matter production mechanisms and properties of the emitted gravitational waves associated with them. We find that the conventional freeze-out and freeze-in mechanisms lead to large and perhaps unobservable frequency of gravitational waves. However, the Dark Matter production is also possible at the second order phase transition leading to the domain wall formation or at the inverse phase transition, when the domain walls get dissolved eventually. In both cases, there is essentially no lower bound on the frequency of emitted gravitational waves.
Full work available at URL: https://arxiv.org/abs/2112.12608
No records found.
No records found.
This page was built for publication: Gravitational shine of dark domain walls
Report a bug (only for logged in users!)Click here to report a bug for this page (MaRDI item Q5099255)
