Interpolation error creating a delta chi2 = 20 on DESI likelihood

[vivianmiranda]

Hi @cmbant @JesusTorrado

In both CAMB and CLASS (older version of Cobaya - so I have not tested if this problem is absent on new versions). I was getting chi2 ~40 for DESI and horrible predictions on bin z = 1.4

Then I made this change (picture attached)

and chi2 drop to 20.

With the fix (random cosmology - see the z=1.49 prediction and DESI chi2):

Without the fix

[cmbant]

Perhaps this was fixed with https://github.com/CobayaSampler/cobaya/pull/344 - can you check on latest master?

The DESI Y1 likelihood in the current master (from DESI team) returns a chi2 of about 21 on the test point.

[vivianmiranda]

I will check that.

On another note - the cover matrix of Pantheon+ (and dv) looks like a javascript code

https://github.com/CobayaSampler/sn_data/blob/master/PantheonPlus/Pantheon%2BSH0ES_STAT%2BSYS.cov

And I am getting reading errors. Is that the correct file?

[vivianmiranda]

Also DES-Y5 is missing (STAT+SYS.txt)

https://github.com/CobayaSampler/sn_data/tree/master/DESY5

[cmbant]

No it’s not, should be same as

https://github.com/PantheonPlusSH0ES/DataRelease/blob/main/Pantheon%2B_Data/4_DISTANCES_AND_COVAR/Pantheon%2BSH0ES_STAT%2BSYS.cov

Antony

From: Vivian Miranda @.> Sent: Monday, April 8, 2024 7:24 PM To: CobayaSampler/cobaya @.> Cc: Antony Lewis @.>; Mention @.> Subject: Re: [CobayaSampler/cobaya] Interpolation error creating a delta chi2 = 20 on DESI likelihood (Issue #352)

I will check that.

On another note - the cover matrix of Pantheon+ (and dv) looks like a javascript code

https://github.com/CobayaSampler/sn_data/blob/master/PantheonPlus/Pantheon%2BSH0ES_STAT%2BSYS.cov

And I am getting reading errors. Is that the correct file?

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[cmbant]

PantheonPlus should be fixed now. (I don't have a test value to add a unit test)

[cmbant]

Also DES Y5 (thanks, looks like an inconsistency in the names in the original repo)

[cmbant]

Is DESI OK for you now on master, can we close?