A new study has proposed that gravitational waves ripples in the fabric of spacetime may have played a direct role in creating dark matter during the universe’s earliest moments, offering a fresh avenue into one of physics’ most enduring mysteries.
The research was conducted by Professor Joachim Kopp of Johannes Gutenberg University Mainz (JGU) and the PRISMA++ Cluster of Excellence, alongside Dr Azadeh Maleknejad of Swansea University. Their work introduces new calculations around an unexplored process in which stochastic gravitational waves could give rise to dark matter particles.
What Is Dark Matter — and Why Does It Matter
Visible matter — everything that can be seen, measured, or detected directly accounts for only about 4 per cent of the universe. Dark matter, by contrast, makes up roughly 23 per cent, shaping galaxies and large-scale cosmic structures. Its presence is inferred through its gravitational effects, but its exact composition remains unknown. Scientists continue to search for both a theoretical framework and experimental proof of what dark matter actually is.
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A Different Kind of Gravitational Wave
Gravitational waves are typically associated with catastrophic events colliding black holes, merging neutron stars. But there is a separate category known as stochastic gravitational waves, produced by processes that do not involve massive celestial objects. These are considerably weaker and form a persistent background signal spread across the universe.
Many stochastic gravitational waves are thought to be extremely ancient, dating to the period shortly after the Big Bang. They may have formed during key stages of early cosmic evolution such as phase transitions as the universe cooled, or through primordial magnetic fields.
The Link to Dark Matter
The study proposes that these primordial gravitational waves may have generated fermions a class of particles that includes electrons, protons, and neutrons with little or no initial mass. Over time, these particles may have acquired mass and eventually evolved into the dark matter that exists in the universe today.
What Comes Next
Professor Kopp outlined the road ahead for this line of research. “The next step in developing this line of research is to go beyond our analytical estimates and conduct numerical calculations to improve the accuracy of our predictions. Another avenue for future research is the investigation of further possible effects of gravitational waves in the early universe. One example for this would be a mechanism that could account for the well-known difference in particles and antiparticles produced,” he said.
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