Cosmology

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8 domain-specific abstractions whose origin domain is Cosmology.

• Angular Diameter Distance — Define cosmological distance by the ratio of an object's proper transverse size at emission to its observed angular size, connecting standard rulers to expansion and spatial geometry.
• Dirac Large Numbers Hypothesis — The cosmological conjecture that several enormous dimensionless ratios built from atomic, gravitational, and cosmic quantities are simply related because they track the universe's age in atomic units, implying time-varying gravitation and associated cosmic evolution.
• Einstein's static universe — Einstein’s 1917 homogeneous, spatially closed cosmological model in which matter and a cosmological constant balance to keep the scale factor constant.
• Meta-cold dark matter — A proposed dark-matter scenario in which nonrelativistic daughter particles are produced relatively late by decay of an earlier cold species.
• Mixed dark matter — A cosmological model in which the dark-matter density contains both cold and hot components, combining different free-streaming and structure-growth effects.
• Starobinsky inflation — A cosmological-inflation model in which a curvature-squared correction to general relativity drives an early quasi-de Sitter expansion.
• Static universe — A cosmological model whose large-scale spatial geometry does not expand or contract with cosmic time.
• Zero-Energy Universe — The cosmological hypothesis that, under a specified general-relativistic energy prescription and global boundary structure, positive matter-and-field contributions are exactly offset by a gravitational contribution so the universe's assigned total energy vanishes.