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“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 16221
School of Particles and Accelerator
  Title:   Gravitational waves from scale-invariant vector dark matter model: probing below the neutrino-floor
  Author(s):  Ahmad Mohammadnejad
  Status:   To Appear
  Journal: Eur. Phys. J. C
  No.:  3
  Vol.:  80
  Supported by:  IPM
  Abstract:
We study the gravitational waves (GWs) spectrum produced during the electroweak phase transition in a scale-invariant extension of the Standard Model (SM), enlarged by a dark U(1)D gauge symmetry. This symmetry incorporates a vector dark matter (DM) candidate and a scalar field (scalon). Because of scale invariance, the model has only two independent parameters and for the parameter space constrained by DM relic density, strongly first-order electroweak phase transition can take place. In this model, for a narrow part of the parameter space, DM-nucleon cross section is below the neutrino-floor limit, and therefore, it cannot be probed by the future direct detection experiments. However, for a benchmark point form this narrow region, we show the amplitude and frequency of phase transition GW spectrum fall within the observational window of space-based GW detectors such as eLISA.

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