New gravity theory suggests dark energy density changed over cosmic history

Data challenges constant dark energy view

Observations from the Dark Energy Spectroscopic Instrument indicate that the mysterious force driving expansion may not be constant. This finding questions the long-held belief that dark energy behaves identically at every epoch in cosmic history.

Theory produces negative then positive density

The international team led by Professor Özgür Akarsu examined a specific region of gravity theory previously ignored by researchers. Their model naturally generates an effective dark energy form with negative density early on before switching to positive values later.

Study remains inconclusive but significant

The results are not yet strong enough to declare a definitive discovery regarding the nature of dark energy. This work intensifies ongoing questions about whether the universe's expansion driver has evolved throughout time.