PPC 2025: XVIII International Conference on Interconnections between Particle Physics and Cosmology

Gamma-Ray and Gravitational Wave Signals of Inelastic Higgs Portal Dark Matter

Not scheduled

30m

Roosevelt Room I (SpringHill Suites Conference Center Deadwood)

Speaker

Subhojit Roy (Argonne National Laboratory)

Description

We explore a simple and predictive dark matter scenario involving a complex scalar field, $\varphi$, coupled to the Higgs portal with no additional field content. In the UV, the field possesses a global $U(1)$ symmetry which is broken by mass terms and Higgs portal interactions. In the mass basis, the complex field splits into a pair of real scalars with a small mass splitting (in analogy with pseudo-Dirac fermions), such that the Higgs portal acquires both diagonal and off-diagonal terms with respect to these eigenstates. In the parameter space where the off-diagonal interaction predominates, this scenario is safe from all existing direct detection constraints. Moreover, this model provides a viable explanation for the longstanding Galactic Center gamma-ray excess. Additionally, this model influences the Higgs potential in a way that could lead to a strong first-order electroweak phase transition, potentially generating a stochastic gravitational wave signal

Presentation materials

PPC_Inelastic_DM_Subhojit_Roy_2025.pdf