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American Focus > Blog > Tech and Science > Wild New Theory Suggests Gravitational Waves Shaped The Universe : ScienceAlert
Tech and Science

Wild New Theory Suggests Gravitational Waves Shaped The Universe : ScienceAlert

Last updated: August 9, 2025 2:35 pm
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Wild New Theory Suggests Gravitational Waves Shaped The Universe : ScienceAlert
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Gravity Waves May Have Shaped the Early Universe

Just as ocean waves shape our shores, ripples in space-time may have once set the Universe on an evolutionary path that led to the cosmos as we see it today. A new theory suggests that gravitational waves, rather than hypothetical particles called inflatons, drove the Universe’s early expansion and the redistribution of matter therein.

The first author of the paper, theoretical astrophysicist Raúl Jiménez of the University of Barcelona, explains, “For decades, we have tried to understand the early moments of the Universe using models based on elements we have never observed. What makes this proposal exciting is its simplicity and verifiability. We are not adding speculative elements, but rather demonstrating that gravity and quantum mechanics may be sufficient to explain how the structure of the cosmos came into being.”

The currently accepted timeline of the Universe’s evolution involves a period of rapid expansion, or inflation, just after the Big Bang. From a single, one-dimensional point of infinite density – a singularity, the mathematical description of the Universe just before the Big Bang – the Universe rapidly inflated, puffing up with a hot plasma soup that cooled to form matter.

The inflaton, a speculative particle or quantum field, is used to explain cosmological inflation and the surprising smoothness of the cosmos. However, despite efforts, physicists have found no other evidence supporting the existence of the inflaton. Jiménez and his colleagues wanted to explore a different approach.

They started with a simplified model of the real Universe consistent with general relativity and current observations of the expansion of the Universe, called de Sitter space. Within this field, quantum fluctuations in space-time, or gravitational waves, can be generated by a type of turbulence called tensor perturbations.

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Gravitational waves, generated by massive disruptions in space-time, are thought to fill the Universe. The researchers found that the gravitational waves generated by tensor perturbations in their space-time model could create density variations in the primordial plasma and drive the early expansion of the Universe.

This elegant solution removes the reliance on hypotheticals as the driving force behind the early evolution of the entire Universe. Further work is needed to verify this theory, but it offers a promising new perspective on the origins of the cosmos.

The research has been published in Physical Review Research and could pave the way for a deeper understanding of the early Universe.

TAGGED:GravitationalScienceAlertShapedsuggestsTheoryuniversewaveswild
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