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Search 3,717 documents across 34 fields — every claim tier-rated by evidence
3,717 documents
34 sections
47,686 citations
34,596+ keywords indexed
4 evidence tiers
2 results for "fifth"
Q_1_15
Cosmology & Physics
Q_1_15 — Dark Energy Models and Quintessence
The accelerating expansion of the universe, discovered in 1998 via Type Ia supernovae, demands an explanation. The simplest model — Einstein's cosmological constant Λ with equation of state $w = p/\rho = -1$ exactly — fi
dark energy
quintessence
cosmological constant
equation of state
w parameter
phantom energy
D_5_04
Sites & Artifacts
D_5_04 — Pythagorean Harmony, Sacred Sound, and the Music of the Spheres
The Pythagorean discovery that musical harmony is governed by simple mathematical ratios (octave = 2:1, fifth = 3:2, fourth = 4:3) is one of the most consequential insights in intellectual history — the first demonstrati
Pythagoras
Pythagorean
Music of the Spheres
harmony of the spheres
musica universalis
harmonic ratios
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