******** CTCD/NTHU HEP Seminar ********

Speaker ：Dr. C.J. Ouseph (Seoultech, Korea).

Title ：Searching for Dark Photon Tridents Through Primordial Black Hole
Signatures

Time ：12:30-13:30, Thursday, 2025/4/17

Place ：R521, 5F, General Building II, Nat'l Tsing Hua Univ.

Host ： Prof. Po-Yen Tseng (NTHU)

Abstract:
The detection of gamma-ray signals from primordial black holes (PBHs)
could provide compelling evidence for their role as a dark matter
candidate, particularly through the observation of their Hawking
radiation. Future gamma-ray observatories, such as e-ASTROGAM, and the
next-generation telescopes, are poised to explore this possibility by
measuring both Standard Model (SM) and beyond-the-SM particle emissions.
A particularly promising avenue involves production of dark photons by
PBHs, which is a hypothetical particle that decays into photons. In this
work, we investigate the trident decay of dark photons focusing on their
primary emission from PBHs. We assume that the dark photons produced via
Hawking radiation decay into photons well before reaching Earth, thereby
enhancing the detectable gamma-ray flux. The energy spectrum of the
photons decaying from the dark photons is distinct from that of direct
Hawking-radiated photons due to higher degree of freedom, leading to
observable modifications in the gamma-ray signal. Using the
asteroid-mass PBHs as a case study, we demonstrate that future gamma-ray
missions could detect dark-photon signatures and distinguish them from
conventional Hawking radiation. This approach enables the exploration of
previously inaccessible parameter spaces in dark photon mass m A ′ and
their coupling to photons, offering a novel pathway to uncover the
properties of dark sectors and the nature of PBHs.



Online link: https://yonsei.zoom.us/j/83838693791