Dark energy: redshift-bin exclusion
Individual run · T-cbe083892a0c
Public summary of an internal test, not yet independently validated or published.
Question investigated
Does the preference for evolving dark energy in Pantheon+ and Union3 persist when the ranges z = 0.01–0.15; 0.15–0.5; 0.5–2.3 are excluded one at a time, with the prior Ωm = 0.3 ± 0.01?
Test conditions
The fit to each compilation (Pantheon+ and Union3) is repeated after excluding, one at a time, the ranges z = 0.01–0.15; 0.15–0.5; 0.5–2.3. The adopted prior is Ωm = 0.3 ± 0.01. BAO constraints are held fixed. Fit quality and dark-energy parameters are compared before and after each exclusion.
Result
Excluding z = 0.01–0.15 from Union3 reduced the fit improvement by about 54%, the largest reduction among the exclusions tested. The ranges had unequal influence, without establishing exclusive dependence on any one of them. The conclusion applies to the compilations, ranges and assumptions examined.
Key figure
Reduction in fit improvement
54 %
Union3: remove z = 0.01–0.15
Removing redshifts 0.01–0.15 reduced the fit improvement in Union3 by about 54%, the largest reduction in this comparison. The result is limited to the tested data, bands and priors and does not establish exclusive dependence on a single band.
Source: Tower public snapshot
Specific limitations
- The comparison tests the sensitivity of the fit to the supernova compilation and the redshift ranges included. It does not replace a full cosmic microwave background analysis.
- The point represents the largest reported reduction in fit improvement for this test; values for the other cuts are unavailable. The result depends on the redshift bin and prior used. Repeated analyses are not independent measurements, and the percentage is not a probability or statistical significance.
This run among the other public runs
The highlighted dot is this record. The other runs use other combinations of data and priors.
- DES-SN5YR
- Union3
- selected run
DES-SN5YRwithout z = 0.01–0.081 run
DES-SN5YRwithout z = 0.01–0.113 runs
DES-SN5YRwithout z = 0.01–0.1518 runs
DES-SN5YRwithout z = 0.023–0.151 run
DES-SN5YRwithout z = 0.01–0.24 runs
DES-SN5YRwithout z = 0.01–0.34 runs
Union3without z = 0.01–0.157 runs
Union3without z = 0.1–0.33 runs
Reduction in fit improvement when the range is removed (%)
- 51Public runs
- 54%Union3 · without z = 0.01–0.15
- 18%–95%Lowest and highest reduction
54%Union3 · without z = 0.01–0.15Open the record T-cbe083892a0c
View the data as a table
| Compilation | Range removed | Reduction (%) | Record |
|---|---|---|---|
| DES-SN5YR | z = 0.01–0.08 | 70 | T-e67a424b5ccf |
| DES-SN5YR | z = 0.01–0.1 | 59 | T-acf9f6789f6a |
| DES-SN5YR | z = 0.01–0.1 | 59 | T-e7ffb1c11d22 |
| DES-SN5YR | z = 0.01–0.1 | 75 | T-5ff8f1fd80a6 |
| DES-SN5YR | z = 0.01–0.1 | 75 | T-d06585fd0e12 |
| DES-SN5YR | z = 0.01–0.1 | 75 | T-fb9b6fc6e544 |
| DES-SN5YR | z = 0.01–0.1 | 91 | T-ce8e413902fb |
| DES-SN5YR | z = 0.01–0.1 | 91 | T-e6b06a801122 |
| DES-SN5YR | z = 0.01–0.1 | 93 | T-04a0ed4d9d28 |
| DES-SN5YR | z = 0.01–0.1 | 93 | T-afcb5fe45fad |
| DES-SN5YR | z = 0.01–0.1 | 93 | T-b97d826bd09f |
| DES-SN5YR | z = 0.01–0.1 | 93 | T-cd51b90ff68b |
| DES-SN5YR | z = 0.01–0.1 | 93 | T-cf7844375210 |
| DES-SN5YR | z = 0.01–0.1 | 93 | T-e33861adf6bf |
| DES-SN5YR | z = 0.01–0.15 | 58 | T-260500679d60 |
| DES-SN5YR | z = 0.01–0.15 | 58 | T-321b843a0e5c |
| DES-SN5YR | z = 0.01–0.15 | 58 | T-423f050911c9 |
| DES-SN5YR | z = 0.01–0.15 | 58 | T-df998f604c97 |
| DES-SN5YR | z = 0.01–0.15 | 58 | T-ed2ce44de389 |
| DES-SN5YR | z = 0.01–0.15 | 75 | T-1367215bcab5 |
| DES-SN5YR | z = 0.01–0.15 | 75 | T-363971e6e7a9 |
| DES-SN5YR | z = 0.01–0.15 | 75 | T-daadb81fcf35 |
| DES-SN5YR | z = 0.01–0.15 | 92 | T-5f0f73082b99 |
| DES-SN5YR | z = 0.01–0.15 | 92 | T-69658e6481b4 |
| DES-SN5YR | z = 0.01–0.15 | 94 | T-05ae703af393 |
| DES-SN5YR | z = 0.01–0.15 | 94 | T-4f3a81c57369 |
| DES-SN5YR | z = 0.01–0.15 | 94 | T-5f5380992840 |
| DES-SN5YR | z = 0.01–0.15 | 94 | T-ec2705915411 |
| DES-SN5YR | z = 0.01–0.15 | 94 | T-f15b202924b6 |
| DES-SN5YR | z = 0.01–0.15 | 95 | T-6630bd2ec70b |
| DES-SN5YR | z = 0.01–0.15 | 95 | T-d3c37bcfa041 |
| DES-SN5YR | z = 0.01–0.15 | 95 | T-d824203da16c |
| DES-SN5YR | z = 0.023–0.15 | 75 | T-78d38345542e |
| DES-SN5YR | z = 0.01–0.2 | 43 | T-28784a6e0dde |
| DES-SN5YR | z = 0.01–0.2 | 63 | T-3e3fa4c5d2da |
| DES-SN5YR | z = 0.01–0.2 | 63 | T-50a63dfd1576 |
| DES-SN5YR | z = 0.01–0.2 | 84 | T-87001adcb352 |
| DES-SN5YR | z = 0.01–0.3 | 18 | T-fc2be79199a2 |
| DES-SN5YR | z = 0.01–0.3 | 44 | T-0666056105a4 |
| DES-SN5YR | z = 0.01–0.3 | 44 | T-188a0c45ae9a |
| DES-SN5YR | z = 0.01–0.3 | 69 | T-0fe707d2a0c0 |
| Union3 | z = 0.01–0.15 | 33 | T-63817dc77958 |
| Union3 | z = 0.01–0.15 | 33 | T-c1650d8fd93c |
| Union3 | z = 0.01–0.15 | 42 | T-c55a31fdb4c9 |
| Union3 | z = 0.01–0.15 | 53 | T-f079e23f2559 |
| Union3 | z = 0.01–0.15 | 54 | T-3e9ad497d065 |
| Union3 | z = 0.01–0.15 | 54 | T-c8b48f8f5e39 |
| Union3 | z = 0.01–0.15 | 54 | T-cbe083892a0c |
| Union3 | z = 0.1–0.3 | 49 | T-5f1fd8c35732 |
| Union3 | z = 0.1–0.3 | 50 | T-3d4bc1b7fd17 |
| Union3 | z = 0.1–0.3 | 52 | T-6ff8a28ad5b0 |
51 public runs. Each dot is the key figure published for one run: the cut that most reduced the fit improvement in that configuration of data and priors. The other cuts of each run are not in the snapshot. Runs are not independent measurements, and the percentage is neither a probability nor a significance. Source: Tower public snapshot