Gravitational waves from walls bounded by strings in SO(10) model of pseudo-Goldstone dark matter

May 19, 2023
8 pages
Published in:
  • Phys.Lett.B 845 (2023) 138127
  • Published: Aug 19, 2023
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Abstract: (Elsevier B.V.)
We explore the gravitational wave spectrum generated by string-wall structures in an SO(10) (Spin(10)) based scenario of pseudo-Goldstone boson dark matter (pGDM) particle. This dark matter candidate is a linear combination of the Standard Model (SM) singlets present in the 126 and 16 dimensional Higgs fields. The Higgs 126-plet vacuum expectation value (VEV) 126H leaves unbroken the Z2 subgroup of Z4, the center of SO(10). Among other things, this yields topologically stable cosmic strings with a string tension μ126H2. The subsequent (spontaneous) breaking of Z2 at a significantly lower scale by the 16-plet VEV 16H leads to the appearance of domain walls bounded by the strings produced earlier. We display the gravitational wave spectrum for Gμ values varying between 1015 and 109 (126H1011 - 1014 GeV), and 16H0.1 - 102 TeV range (G denotes Newton's constant.) These predictions can be tested, as we show, by a variety of (proposed) experiments including LISA, ET, CE and others.
Note:
  • 8 pages, 3 figures, version published in PLB
  • gravitational radiation: spectrum
  • boson: dark matter
  • gravitation: fundamental constant
  • cosmic string: stability
  • SO(10)
  • Goldstone particle
  • string
  • GeV
  • Spin(10)
  • domain wall