Physics › Section W · Particle physics and frontiers › Topic W.4
Frontiers: cosmology, gravity, dark matter, and beyond
The physics of the very small turns out to explain the very large. This survey visits the expanding universe, black holes and gravitational waves, and the dark matter and dark energy that make up most of the cosmos, keeping a clear line between what is measured and what is still speculation.
In this topic
- An expanding universe
- Worked example: Hubble's law and the age of the universe
- Echoes of a hot beginning
- General relativity: gravity as curved spacetime
- Black holes
- Worked example: how big is a black hole?
- Gravitational waves and quantum gravity
- Dark matter and dark energy
- Worked example: weighing the Milky Way
- Other frontiers
- Common mistakes to avoid
- Key takeaways
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