Equation 1 · Comparing the Main Approaches to Precision Cosmology
What does this equation mean?
Read the formula alongside the article passage below. Each part has a deeper page with its role in the equation, the supporting passage and nearby citations.
This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text. Read the equation part by part below; each part has a contextual explanation and a link to its mathematical background.
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Symbol sigma_8
sigm is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
subscript
The lower label selects a particular version, component, or indexed member of the quantity. For example, x₀ and xₜ can be values at different positions.
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What the article says around this equation
The second, quieter disagreement is the S8 tension. S8 is a combination of the amplitude of matter density fluctuations and the matter density parameter , defined as
Sources cited in the article section
- [1] Planck 2018 results. VI. Cosmological parameters ↗
- [2] A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team ↗
- [7] Is the sigma-8 tension being sheared away? Cosmology with weak lensing from KiDS ↗
These citations give research context. Read each source to check which claims it supports.
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