Cosmology2026-07-091 minarXiv:2607.08120expressDark Energy Plays Seesaw: New Clue to a Strange SignalDark energy — the mysterious substance responsible for the accelerated expansion of the universe — may not be a constant factor but a variable force.Jinglong Liu·Tucker Manton·Yifu Cai·Antonino MarcianoFermi accelerationEnrico FermiAdam RiessAlan Guthdark energydark matterquintessenceredshiftcosmological constant👍👎☆SimplePopularAdvanced