A vivid view of the universe showing a star-filled deep space panorama with colorful nebula clouds and distant galaxies, highlighting the vast scale of the cosmos. Hyderabad: A study by researchers from BITS Pilani, published in the International Journal of High Energy Astrophysics, has proposed a new explanation for one of modern science’s biggest mysteries — the accelerating expansion of the Universe.For nearly three decades, astronomers have known that the Universe is expanding at an increasing rate. The prevailing cosmological model attributes this acceleration to an unknown form of “dark energy,” but its physical origin remains unclear.The new study introduces an alternative framework called Topological Dark Energy (TDE), suggesting that cosmic acceleration may arise naturally from the quantum structure of spacetime itself. According to the researchers, spacetime behaves like a dynamic quantum “foam,” constantly undergoing microscopic changes in geometry. The cumulative effect of these tiny topological fluctuations could generate the force driving the Universe’s accelerated expansion, eliminating the need for hypothetical particles or fields.“To test the idea, we developed a detailed cosmological model and compared its predictions with major observational datasets, including DESI baryon acoustic oscillation measurements, Union3 Type Ia supernova observations and Planck Cosmic Microwave Background data,” said researcher Kavya NS.She said the model successfully reproduced the observed expansion history of the Universe and remained consistent with the standard cosmological model.“Our work explores the possibility that cosmic acceleration is an emergent consequence of the quantum-topological structure of spacetime rather than a fundamental cosmological constant or exotic fields,” said Pradyumn Kumar Sahoo, another researcher.“The framework connects concepts from Euclidean quantum gravity with observational cosmology, providing a new physical interpretation for dark energy,” added Sai Swagat Mishra. He noted that comparisons with multiple observational datasets showed the framework is observationally viable and capable of reproducing the Universe’s expansion history.
