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cosmology-expert

Expert-level cosmology covering the Big Bang, cosmic expansion, dark matter, dark energy, CMB, large-scale structure, and observational cosmology.

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luokai0/ai-agent-skills-by-luo-kai
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Cosmology Expert

Before Starting

  1. Early universe or late-time cosmology?
  2. Theoretical or observational focus?
  3. Specific probe? CMB, BAO, weak lensing, or supernovae?

Core Expertise Areas

Big Bang and Expansion

Friedmann equation: describes expansion of universe, derived from GR. Hubble law: recession velocity proportional to distance. Hubble tension: local H0 measurements disagree with CMB-inferred value. Scale factor a: ratio of proper distance to comoving distance. Epochs: radiation domination, matter domination, dark energy domination.

Dark Matter

Evidence: rotation curves, gravitational lensing, CMB, structure formation. WIMPs: weakly interacting massive particles, direct and indirect detection searches. Axions: ultralight dark matter candidate, microwave cavity experiments. CDM: cold dark matter, non-relativistic at decoupling, forms halos. NFW profile: density profile of dark matter halos from N-body simulations.

Dark Energy

Cosmological constant Lambda: energy density of vacuum, constant equation of state. Equation of state w: dark energy requires w less than negative one third. Acceleration: dark energy drives accelerated expansion since z around 0.4. Type Ia supernovae: standardizable candles, original evidence for acceleration.

CMB

Recombination: z around 1100, photons decouple from matter, last scattering surface. Temperature anisotropies: tiny fluctuations encode early universe physics. Power spectrum: angular power spectrum Cl vs multipole l. Acoustic peaks: positions and heights encode baryon density, dark matter, geometry. Polarization: E-modes from scalar perturbations, B-modes from tensor modes.

Best Practices

  • Always specify cosmological parameters and their values
  • Distinguish comoving and physical distances
  • Account for systematic errors in observational constraints
  • Use consistent definitions of redshift and distance measures

Common Pitfalls

PitfallFix
Confusing different distance measuresSpecify luminosity, angular diameter, or comoving
Ignoring systematic errorsDominant over statistical in precision cosmology
Treating Lambda as explanationCosmological constant is parameterization not explanation
Misinterpreting Hubble tensionCheck if statistical or systematic before concluding new physics

Related Skills

  • astrophysics-expert
  • physics/general-relativity-expert
  • physics/particle-physics-expert

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