When a primordial black hole passes through a dying star, the encounter could ignite a cosmic explosion visible across galaxies—this is the startling premise behind a new study led by Dr. Shing-Chi Leung of SUNY Polytechnic Institute. In a paper published in The Astrophysical Journal, Leung and his team explore how these ancient, invisible relics from the early universe might trigger type Ia supernovae, the very explosions astronomers use to measure the expansion of the cosmos. The implications ripple outward: not only could this explain long-standing mysteries about how certain stars explode, but it also strengthens the case that primordial black holes—long considered speculative—could make up the elusive dark matter that dominates the universe’s mass.
Type Ia supernovae are known for their consistency, serving as “standard candles” that helped reveal the existence of dark energy. Yet their precise origins have remained uncertain. The standard model assumes a white dwarf star accumulates mass until it reaches a critical limit and explodes. But Leung’s team proposes an alternative: a primordial black hole, just a fraction of a solar mass, could pass through a white dwarf and unleash enough tidal energy to set off the detonation. In their first paper, they showed these PBH-triggered explosions match observed light curves. Now, in the second installment, they’ve gone further—comparing their models to real-world data from supernova remnants like Tycho, Kepler, and 3C 397, as well as nearby events such as SN 2011fe and SN 2012cg.
By analyzing isotopic signatures—particularly the ratios of nickel-56, nickel-57, manganese, and iron—the researchers found that PBH-triggered models align closely with observed chemical patterns. These isotopes act as forensic clues, revealing the mass and metallicity of the original star. Even more compelling, when the team fed their models into galactic chemical evolution simulations, they discovered that including PBH-triggered supernovae was essential to reproducing the elemental abundances seen in Milky Way stars. In other words, the universe’s chemical makeup may bear the fingerprints of primordial black holes.
Seth Walther, a SUNY Poly senior and co-author on the study, contributed to the galactic simulations during a summer research project. His work helped quantify how successive supernovae enrich galaxies with heavy elements over billions of years. "Being a part of physics research has advanced my knowledge of important industry standards in writing, presenting and coding," Walther said, reflecting on how the experience shaped his career path.
While primordial black holes remain undetected directly, their potential role in shaping supernovae and seeding galaxies with elements like manganese and nickel brings them one step closer to the mainstream. As Leung puts it, "Our work suggests that some of the supernovae we observe may be the result of primordial black holes." If confirmed, this would not only rewrite our understanding of stellar death but also illuminate one of the darkest corners of the cosmos.