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  • Open Access

Dark clouds to silver linings over the hyperchargeless scalar triplets

Priyotosh Bandyopadhyay* and Snehashis Parashar†

  • *Contact author: bpriyo@phy.iith.ac.in
  • †Contact author: ph20resch11006@iith.ac.in
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Phys. Rev. D 112, 055032 – Published 23 September, 2025

DOI: https://doi.org/10.1103/2tp2-hwh2

Abstract

A real scalar triplet with zero hypercharge offers a minimal nontrivial extension of the Standard Model (SM) with a charged Higgs and a possible dark matter or custodial symmetry breaking signature. The Z2-odd inert triplet model (ITM) provides a dark matter, while the noninert Higgs triplet model (HTM) breaks the custodial symmetry, enabling rich collider signatures. Both these models also promise the viability of a first-order phase transition (FOPT). This article revisits both models under various theoretical and current experimental constraints, revealing a trade-off between DM and FOPT viability, and explores the resulting gravitational wave signals and collider prospects.

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Phys. Rev. D 112, 055032– Published 23 September, 2025
  • Received 3 June 2025
  • Accepted 27 August 2025
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