Scientists are exploring a fascinating idea: some of the brilliant stellar explosions seen across the universe may have been triggered by tiny black holes formed shortly after the Big Bang.
A new study led by researchers at the State University of New York Polytechnic Institute (SUNY Poly) suggests that these mysterious objects, called primordial black holes, could be responsible for a portion of the type Ia supernovae observed in space.
The findings were published in The Astrophysical Journal.
Primordial black holes are theoretical objects that may have formed during the universe’s earliest moments.
Scientists believe that small fluctuations in matter density shortly after the Big Bang could have created these black holes.
They are especially interesting because they may account for some or even all of dark matter, the invisible substance thought to make up most of the matter in the universe.
Unlike ordinary black holes, primordial black holes could be extremely small and difficult to detect directly. However, researchers believe they may reveal themselves through their interactions with stars.
The new study focuses on what happens when one of these black holes passes through a white dwarf.
A white dwarf is the dense, compact core left behind when a low-mass star, such as our sun, reaches the end of its life.
Although white dwarfs are stable under normal conditions, the intense gravitational forces generated by a passing primordial black hole could trigger a massive explosion known as a type Ia supernova.
Type Ia supernovae are among the most important objects in astronomy. Because they shine with predictable brightness, scientists use them as “standard candles” to measure distances across the universe.
Observations of these supernovae played a key role in the discovery that the universe’s expansion is accelerating due to dark energy.
In an earlier study, the research team showed that supernovae triggered by primordial black holes would look remarkably similar to ordinary type Ia supernovae.
They would even follow the same brightness patterns used by astronomers to measure cosmic distances. This raises the possibility that some supernovae already observed by scientists may have been caused by primordial black holes.
In their latest work, the researchers compared their models with observations of well-known supernova remnants, including Tycho, Kepler and 3C 397, as well as nearby supernovae and stars in our Milky Way galaxy.
The team examined radioactive elements such as nickel-56 and nickel-57, along with stable elements including manganese and nickel. These chemical fingerprints helped the researchers estimate the properties of the stars that exploded.
They also used computer simulations to study how these supernovae contribute to the chemical evolution of galaxies.
Every supernova releases newly formed elements into space, enriching future generations of stars and planets. The researchers found that including primordial black hole-triggered supernovae in their models better matched the chemical patterns observed in stars throughout the Milky Way.
“Our work suggests that some of the supernovae we observe may be the result of primordial black holes,” said physicist Shing-Chi Leung, who led the study.
Although primordial black holes remain hypothetical, the research shows that they may have left clues hidden in some of the universe’s brightest explosions. By studying these cosmic blasts and the elements they produce, scientists hope to learn more about the mysterious origins of dark matter and the earliest moments of the universe itself.
Source: KSR.
