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Dark Energy May Have Flipped from Negative to Positive 9.5 Billion Years Ago
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What Happened?
New observations suggest that dark energy, responsible for the Universe's accelerating expansion, may have changed from negative to positive density around 9.5 billion years ago. This challenges long-held assumptions about its constancy.
Key points
- Dark energy's influence may have changed over billions of years.
- Research led by Prof. Özgür Akarsu at Istanbul Technical University explored an alternative theory of gravity.
- The study suggests dark energy had a negative density in the early Universe before becoming positive.
- The effective density of dark energy reached zero around 9.5 billion years ago.
- The findings could help address the Hubble tension, a discrepancy in measuring the Universe's expansion rate.
Key insights
- The findings may lead to new models of cosmic evolution.
- If dark energy can change, it could influence future cosmological theories.
- The research highlights the importance of revisiting established theories in physics.
Why it matters
Understanding dark energy's behavior could reshape our knowledge of cosmic expansion.
Tags
Entities
Özgür Akarsu· PersonIstanbul Technical University· OrganizationPhysical Review D· EventDESI· OrganizationDoğuş University· OrganizationKyoto University· Organization
Source
Science Daily
