🌌 Cosmology — Advanced#

Scope — Theoretical frameworks, dark components, and unresolved questions about cosmic origin and fate.

Key concepts#

• Dark matter — unseen matter inferred from gravitational effects on galaxies and clusters.
• Dark energy — driver of accelerated cosmic expansion.
• Cosmological parameters — quantities describing expansion rate, matter content, and geometry.

Seed Q&A triads#

• Q: How do we infer the existence of dark matter?
  A: From gravitational effects such as galaxy rotation curves and gravitational lensing.

• Q: What role does dark energy play in cosmic evolution?
  A: It accelerates expansion, influencing the universe’s long‑term fate.

• Q: Why is cosmology closely tied to fundamental physics?
  A: Extreme conditions in the early universe test theories of gravity, particles, and spacetime.

Contributor prompts and extensions#

• Add a worked example estimating cosmic age from the Hubble constant.
• Include a short discussion of inflation and its role in explaining large‑scale uniformity.
• Connect cosmological observations to open questions in quantum gravity.

Advanced exercises#

• Analyze how changing cosmological parameters alters predicted expansion histories.