轴子（axion）是为解决什么问题而被提出的？
What problem was the axion originally proposed to solve?
轴子原为解释强相互作用中“CP 破坏为何极小”（强 CP 问题）而设，后来发现它若极轻且弱耦合，正好可作冷暗物质候选，实验用微波腔“监听”其转化光子。
The axion was proposed to explain why strong-interaction CP violation is tiny; being very light and weakly coupled it also fits cold dark matter, and experiments listen for it converting to photons in microwave cavities.
难度 专业 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Ryden，《宇宙学导论》（第2版）
Ryden, 'Introduction to Cosmology' (2nd ed.)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL8446280W：Introduction to Cosmolo
#轴子 #强CP问题 #暗物质
修改引力理论（如 MOND）能否替代暗物质？
Can modified-gravity theories like MOND replace dark matter?
MOND 在星系尺度用修改的引力成功拟合旋转曲线，却难解释星系团、引力透镜与宇宙微波背景；主流仍认为暗物质（尤其 WIMP、轴子）更自洽。
MOND fits galaxy rotation curves by modifying gravity but struggles with clusters, lensing and the CMB; most physicists still favor dark matter (WIMP/axion) as more consistent.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Milgrom，《对牛顿动力学的修正》，The Astrophysical Journal 270 (1983)
Milgrom, 'A Modification of the Newtonian Dynamics', The Astrophysical Journal 270 (1983)
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1086/161131：A modification of the Newtoni
#MOND #修改引力 #暗物质
暗物质和暗能量是同一种东西吗？
Are dark matter and dark energy the same thing?
不是。暗物质用引力把星系聚在一起；暗能量则像一种负压力，让宇宙加速膨胀。两者都不发光，但作用方向相反。
No. Dark matter's gravity holds galaxies together, while dark energy acts like a repulsive pressure speeding up expansion. Both are invisible but opposite in effect.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Ryden，《宇宙学导论》（第2版）
Ryden, 'Introduction to Cosmology' (2nd ed.)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL8446280W：Introduction to Cosmolo
#暗物质 #暗能量 #宇宙学
弱相互作用大质量粒子（WIMP）为什么是热门候选？
Why is the WIMP a popular dark-matter candidate?
WIMP 只通过引力和弱力作用、质量较大、运动慢，早期宇宙刚好能留下今天观测到的暗物质密度（“WIMP 奇迹”），实验用深地探测器等待它撞上原子核。
WIMPs interact only via gravity and the weak force, are heavy and slow, and naturally yield today's dark-matter density from the early universe (the WIMP miracle); detectors deep underground wait for them to hit nuclei.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Bertone、Hooper 与 Silk，《粒子暗物质：证据、候选者与约束》，Physics Reports 405 (2005)
Bertone, Hooper & Silk, 'Particle Dark Matter: Evidence, Candidates and Constraints', Physics Reports 405 (2005)
独立核验依据 · Independent verification: 核验依据 1 ARCHIVE 标识 arxiv-hep-ph0404175：Particle Dark Matter: Evi
#WIMP #弱相互作用 #暗物质
引力透镜怎么给暗物质“称重”？
How does gravitational lensing weigh dark matter?
大质量天体会弯折背后星光（引力透镜），弯曲程度取决于总质量；比较可见质量与透镜质量之差，就得到暗物质分布。
Massive objects bend background light (gravitational lensing); the bending depends on total mass, so comparing visible vs lensing mass reveals dark matter.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Ryden，《宇宙学导论》（第2版）
Ryden, 'Introduction to Cosmology' (2nd ed.)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL8446280W：Introduction to Cosmolo
#引力透镜 #暗物质 #质量
暗物质就是“黑黑的东西”吗？
Is dark matter just something black?
不是普通黑色物体。暗物质不发光也不挡光，我们靠它对星系旋转的引力影响才知道它存在。
It is not simply dark stuff. Dark matter neither emits nor blocks light; we infer it from the gravity that shapes how galaxies spin.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Ryden，《宇宙学导论》（第2版）
Ryden, 'Introduction to Cosmology' (2nd ed.)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL8446280W：Introduction to Cosmolo
#暗物质 #引力 #星系