Résultats de DESI : une révolution en approche sur nos connaissances sur l'énergie noire
2025年3月19日，国际科学合作项目DESI（暗能量光谱仪）发布了最新观测结果，初步表明驱动宇宙加速膨胀的暗能量可能随时间演化。这一发现若获后续证实，将挑战当前以宇宙学常数为核心的宇宙学标准模型。
DESI项目由包括法国原子能与替代能源委员会（CEA）在内的国际团队主导。CEA物理学家艾蒂安·布尔坦指出，此次数据分析基于对数百万个星系和类星体的观测，旨在精确测量宇宙膨胀的历史。初步数据显示，暗能量的状态方程参数可能并非恒定，而是随宇宙年龄发生变化。
目前主流宇宙模型将暗能量解释为爱因斯坦引入的宇宙学常数，其能量密度保持不变。但DESI的初步结果暗示，暗能量密度可能在过去数十亿年中逐渐减弱。若该趋势得到确认，现有宇宙学框架将需重大修正，甚至引发对引力理论本身的重新思考。
研究人员强调，当前结论仍需更多数据验证。DESI项目计划持续运行至2026年，届时累积的观测数据有望提供更确凿的证据。这一潜在突破或将重塑人类对宇宙终极命运的理解。
New results from the Dark Energy Spectroscopic Instrument (DESI) collaboration, published March 19, 2025, provide compelling evidence that dark energy—the mysterious force driving the accelerated expansion of the universe—may not be constant but instead evolves over time. This finding, if confirmed by future data, would fundamentally challenge the current standard model of cosmology, which relies on a static cosmological constant to explain cosmic acceleration.
The DESI collaboration, an international effort involving France's CEA (Atomic Energy and Alternative Energies Commission), has analyzed its first year of data with unprecedented precision. According to physicist Etienne Burtin of the CEA, the measurements suggest the density of dark energy appears to have varied across cosmic history. "The data show a preference for a form of dark energy that changes over time," Burtin explains, noting this represents a significant departure from Einstein's cosmological constant, a cornerstone of the prevailing Lambda-CDM model.
The implications are profound. A dynamic dark energy would invalidate the current model and necessitate a new theoretical framework for understanding the universe's composition and ultimate fate. DESI's early findings are based on mapping the three-dimensional positions of tens of millions of galaxies and quasars, creating the largest and most detailed map of the universe to date to trace expansion history.
Researchers caution that while the statistical evidence is strong, more data is needed for definitive confirmation. The DESI instrument, mounted on a telescope in Arizona, is only about 10% through its planned five-year survey. The coming years of observations will be critical to solidify these preliminary results, which Burtin describes as potentially heralding "a revolution in our understanding of dark energy."
Publiés ce mercredi 19 mars 2025, les nouveaux résultats de DESI, collaboration internationale associant le CEA, tend à confirmer que l’énergie noire, ce phénomène pilotant l’accélération de l’expansion de l’Univers, évoluerait au cours du temps. Si les résultats futurs confirment cette découverte, le modèle actuel expliqué par une constante cosmologique serait invalidé. Explications avec Etienne Burtin, physicien au CEA.
DESI’s new results suggest dark energy may change over time, potentially overturning the standard cosmological constant model if confirmed.
DESI — international astronomy collaboration, global.
CEA — French public research organization, based in France.
Monitor — important for fundamental science, but limited immediate commercial impact.