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Scientists Propose Fifth 'Dark Dimension' to Explain Dark Energy and Matter
Key points
- A fifth "dark dimension" is proposed to govern dark energy and dark matter.
- The hypothesis suggests dark energy's value changes over time.
- Recent DESI results hint at a changing dark energy value, aligning with the hypothesis.
- The concept originated from string theory research.
The Dark Dimension Hypothesis
Scientists have put forward the concept of a fifth "dark dimension" that could explain the behavior of both dark energy and dark matter. This hypothesis, detailed in a recent preprint study, suggests that this dimension changes over time and could provide a unified explanation for these cosmic phenomena.
Addressing Cosmic Mysteries
The proposed dark dimension offers a potential solution to long-standing mysteries in science, including the nature of dark matter, which accounts for most of the universe's mass, and dark energy, responsible for the universe's accelerating expansion. The idea emerged from string theory, which posits the existence of multiple dimensions beyond the four we perceive.
Evolution of Dark Energy
Cumrun Vafa, a professor at Harvard University and co-author of the studies, explained that the fifth dimension is linked to the value of dark energy, implying that changes in this dimension would cause dark energy to change. This contrasts with the conventional understanding from the standard model of cosmology, which assumed a fixed value for dark energy.
Observational Support from DESI
The assumption of constant dark energy has been challenged by initial results from the Dark Energy Spectroscopic Instrument (DESI) survey, released in 2025. DESI's findings suggest that the value of dark energy may indeed shift over time, aligning with predictions made by Vafa's team regarding the dark dimension. This observational hint provides support for the new hypothesis.
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Primary sources
arXiv 2205.12293Reporting from
Scientists have proposed a fifth "dark dimension" that could explain both dark energy and dark matter, building on string theory. This hypothesis suggests that dark energy's value changes over time, a concept supported by recent data from the Dark Energy Spectroscopic Instrument (DESI). The proposal offers a potential solution to major mysteries in cosmology and could be observationally detected in the near future.