# Inflation

Canonical: https://manyspace.aporia.systems/topics/inflation-phy-cosmo-180
Updated: 2026-10-13

Physics · Cosmology · PHY-COSMO-180

- Difficulty: 5 / 5
- Importance: 3 / 5
- Study time: 9.5–16.5 h

horizon/flatness problems, scalar fields, primordial perturbations

## Why it matters

Physics of the universe as a whole — expansion, history and composition; ties GR, particle physics and astro-observations together.

## Where it is used

Interpreting telescope surveys, dark matter/dark energy research, CMB analysis, theoretical cosmology careers.

## How you know you have learned it

Explain/derive key result from memory + solve 2 non-routine checks.

## What you need first

- [Tensor Calculus](https://manyspace.aporia.systems/topics/tensor-calculus-phy-gr-165) (required)
- [Microstates & Macrostates](https://manyspace.aporia.systems/topics/microstates-macrostates-phy-statm-095) (helpful)
- [Fundamental Particles](https://manyspace.aporia.systems/topics/fundamental-particles-phy-part-157) (helpful)

## Resources

- Modern Cosmology (Dodelson) — Scott Dodelson