X ComHEP: Colombian Meeting on High Energy Physics

Session

Dark Matter

1 Dec 2025, 09:00

Auditorio Principal (Edificio de Extensión)

Conveners

Dark Matter

• Oscar Zapata

Dark Matter

• Oscar Zapata

Dark Matter

• Carlos E. Yaguna

90. Dark matter spikes as laboratories for Particle Physics

Alejandro Ibarra (Technical University of Munich)

01/12/2025, 09:00

91. New Thermal Decoupling Windows to the Dark Sector

Patrick Fitzpatrick (Instituto de Física UNAM)

01/12/2025, 09:45

50. A Multi-component Dark Matter Interpretation of the Galactic Center GeV Excess

Carlos E. Yaguna

01/12/2025, 11:00

The Galactic Center GeV Excess is a persistent anomaly in gamma-ray data that could be explained by dark matter annihilations. In this talk, we explore, in a model-independent way, the possibility that this excess is a signature of a dark sector with multiple DM particles. Specifically, we present the final states and annihilation rates that best fit the current data for scenarios with 2 and 3...

71. Dark sector with fermion dark matter and a dark scalar.

Amalia Betancur Rodriguez (EIA University (CO))

01/12/2025, 11:20

In this talk, we introduce a fermionic dark-matter model whose interactions with the Standard Model proceed via vector and scalar mediators. We will show that the model exhibits a rich dark matter phenomenology, while also possessing a constrained parameter space that can be further probed by future experiments.

19. Two dark matter candidates in a doublet-triplet Higgs model

Sheryl Melara Duron (UNAH)

01/12/2025, 11:40

We studied a Standard Model (SM) extension that provides a bicomponent dark matter scenario. The scalar sector of the SM is extended by adding an inert SU(2) doublet and an inert SU(2) triplet, as well as a SU(2) triplet with hypercharge Y=1 to generate the light neutrino masses through type-II seesaw mechanism. The contribution of the two dark matter candidates to the total dark matter...

80. Pion dark matter in a θ vacuum: a thermal relic with sharp velocity-dependent self-interactions

Oscar Zapata

01/12/2025, 14:00

As recently proposed, a non-vanishing topological angle may play a central role in QCD-like theories of dark matter (DM). In this work, we introduce a dark photon portal to the Standard Model in order to establish thermal equilibrium in the early Universe, and discuss the ensuing phenomenological constraints, including the stability of DM. The resulting dynamics accounts for the observed DM...

5. Constraining Exothermic Dark Matter via Effective Theory in the PICO-60 Bubble Chamber

Rajan Anderson Dornan (IFUNAM)

01/12/2025, 14:20

The PICO collaboration operates the world’s most sensitive bubble chambers for dark matter searches, setting some of the strongest constraints on spin-dependent WIMP–nucleon interactions. As the traditional WIMP parameter space becomes increasingly constrained, attention is turning toward light and exotic candidates, including fermionic and vector dark matter with absorptive (exothermic)...

67. First-Order Phase Transitions in the Dark Sector

Andres Gomez (Universidad de Antioquia)

01/12/2025, 14:40

SIMP dark matter can be realized through low-energy $SU(N_c)$ effective theories, where dark matter consists of the Goldstone bosons associated with the spontaneous breaking of chiral symmetry, the dark pions. The restoration of this symmetry in the early universe may proceed through a first-order phase transition (FOPT), capable of generating a stochastic background of gravitational waves...

68. Gravitational Waves from Electroweak Phase Transition in a Z6-Symmetric Dark Matter Model

Daniel Ruiz Mejía (Universidad de Antioquia)

01/12/2025, 15:00

We investigate the nature of the electroweak phase transition (EWPT) in a minimal $Z_6$-symmetric extension of the Standard Model, featuring a fermionic dark matter candidate ($\psi_L,\psi_R$) and a real scalar singlet ($\phi$). Selecting benchmark points that satisfy both the observed dark matter relic density and direct detection constraints, we analyze whether the EWPT is first-order in...