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78 lines
2.6 KiB
Markdown
78 lines
2.6 KiB
Markdown
# DESI NOIRLab2610 Calibration Note
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**Date:** 2026-05-09
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**Status:** `EXTERNAL_CALIBRATION_PRIOR`
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**Source:** https://noirlab.edu/public/news/noirlab2610/
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**Claim boundary:** this is an external observation-scale calibration note. It
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is not imported data, not a cosmology fit, not a proof of the universe model,
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and not a stellar-gas emission-line calibration by itself.
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## Source Facts
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The NOIRLab release is titled:
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```text
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DESI Completes Planned 3D Map of the Universe and Continues Exploring
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```
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The page metadata states that the Dark Energy Spectroscopic Instrument has
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mapped more than 47 million galaxies and quasars, producing the largest
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high-resolution 3D map of the Universe to date. It also states that DESI is
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mounted on the NSF Nicholas U. Mayall 4-meter telescope and will continue
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observations into 2028 because of instrument performance and hints that dark
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energy might evolve.
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## Why This Calibrates The Stack
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This belongs in the stack as a large-scale-structure calibration prior:
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```text
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redshift sample count
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+ sky footprint / selection function
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+ galaxy/quasar tracer class
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+ BAO / expansion-distance surface
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+ survey extension window
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```
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For the project model, this is useful because it supplies an external anchor for
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how information physics propagates through large countable tracers rather than
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through a single local channel. In SMN terms, the high semantic mass comes from
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population size, tracer diversity, selection-function burden, and cosmological
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parameter pressure.
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## Calibration Variables To Track
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```text
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N_tracers > 47 million galaxies and quasars
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instrument DESI
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mount Mayall 4-meter telescope
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map_kind high-resolution 3D large-scale-structure map
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continuation observations extended into 2028
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calibration_use expansion-distance / dark-energy evolution prior
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```
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## Minimal Equation Hooks
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These are hooks, not fitted results:
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```text
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z -> comoving_distance(z; H0, Omega_m, Omega_DE, w)
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BAO scale -> D_M(z) / r_d and H(z) * r_d
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semantic_load_DESI ~ log(N_tracers) + tracer_diversity + selection_function_burden
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```
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The next useful tool step is to keep DESI as a calibration-prior source for
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large-scale topology and expansion models, while keeping MaNGA line-ratio data
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as the local stellar-gas/shock-proxy lane.
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## HOLD Conditions
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- HOLD any numerical cosmology claim until a DESI data table, covariance, and
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model-fit receipt are imported.
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- HOLD any stellar-gas transfer until a bridge explicitly maps large-scale
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structure statistics to local gas diagnostics.
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- HOLD any dark-energy-evolution claim until source papers/data products are
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cited and fit locally.
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