Computers and software • Clarification on Perturbation Variables in CAMB's...
Hello everyone,I'm currently studying CAMB's perturbation equations (in equations.f90) and have a few clarifying questions:1. The Fractional Density Perturbations:What exactly are the fractional...
View ArticleComputers and software • Re: Clarification on Perturbation Variables in...
The CAMB notes define most thingshttps://cosmologist.info/notes/CAMB.pdfThe transfer function is just a definition (including Lambda would be odd as it would change the order of magnitude of the power...
View ArticleComputers and software • GetParams with same output as SampleDict
Hi, I have notice that the function GetParams from the GetDist library only returns the values that have been simulated in a MCMC, but not those which had been added as priors with no variations. For...
View ArticleComputers and software • Re: GetParams with same output as SampleDict
Can try MCSamples.ranges.fixedValueDict()Statistics: Posted by Antony Lewis — March 27 2025
View ArticleComputers and software • The MCMC does not start properly.
camb can be executed correctly after modification, but when running the chain, an error is reported, MCMC.f90: Couldn't start after 1000 tries - check starting ranges, I don't know what the reason...
View ArticleComputers and software • Re: The MCMC does not start properly.
Can try building and running with Debug option.If you ran with Cobaya instead, you could use --debug option to see output of parameters being tried and what the likelihood being returned...
View ArticleCosmoCoffee • Re: Can not register, username problem
Are you using "Ronaldo Batista" as the username?Statistics: Posted by Antony Lewis — March 31 2025
View ArticleComputers and software • Cobaya: fitting to subset of supernovae
Hello,Is there a way to use only a subset of supernovae in a sample in cobaya? I see the _apply_mask() function in the PantheonPlus SN class in this file:...
View ArticleComputers and software • Re: Cobaya: fitting to subset of supernovae
Not something I've tried, so possibly notStatistics: Posted by Antony Lewis — April 06 2025
View ArticleComputers and software • Full-shape measurements DESI DR1
Hello,Is there a public likelihood for the full shape DESI DR1 data release equivalent to the SDSS DR12 one available in cobaya?Thanks!bao.sdss_dr12_consensus_full_shape: Likelihood of the full-shape...
View ArticleConferences and meetings • Black Holes & Cosmology 2025, Reykjavik,...
The purpose of the Black Holes & Cosmology 2025 is to bring together world-renowned experts as well as junior researchers working on theoretical and observational aspects of black holes,...
View ArticleComputers and software • Saving Cls and mpk from cobaya
I am interested in running cobaya with a specific set of cosmological parameters and having it save the Cls and matter power spectrum. Is there a quick way to do this?Statistics: Posted by Tristan L...
View ArticleComputers and software • Re: Saving Cls and mpk from cobaya
After poking around a bit, I found a way to do this:Code: import cobayaimport numpy as npfrom cobaya.yaml import yaml_loadfrom cobaya.model import get_modelyaml_file='./XXX.yaml' #your yaml fileinfo =...
View ArticleComputers and software • MontePython: Using Different Parameterizations
I am using MontePython with CLASS_EDE. As a new user, right now I can constrain the standard LCDM model. I want to constrain CPL parameterization. For this, from what I have gathered, I need to use...
View ArticleJob vacancies • 2+1 yr galaxy evolution postdoc at IA NCU Torun - deadline 11...
Post-doctoral position in galaxy evolution funded by a research grant from the National Science Centre, Poland, led by Dr Maciej Koprowski, at the Institute of Astronomy, Nicolaus Copernicus...
View ArticleComputers and software • Sterile neutrinos in CAMB
I want to understand how CAMB treats the parameter num_massive_neutrinos when considering the existence of a massive sterile neutrino. If meffsterile is set to a non-zero value, does...
View ArticleComputers and software • Re: Sterile neutrinos in CAMB
The camb notes may help?https://cosmologist.info/notes/CAMB.pdfStatistics: Posted by Antony Lewis — April 24 2025
View ArticleCosmoCoffee • Model of universe
I have a scientific paper which have a potential to break the existing theories of universe. But I am finding it difficult where to send to let the physicists know about it.Statistics: Posted by Guest...
View ArticleComputers and software • Question about cobaya
Hi everybody, I want to know where Cobaya makes the comparison between the likelihood planck_2018_lensing.CMBMarged and CAMB simulations of angular power spectra Cls. I was successful in finding that...
View ArticleComputers and software • using absolute mag with the Union and DESY5...
Hello, I want to apply the SH0ES calibration for the type Ia supernova absolute magnitude to either the Union3 or DESY5 data sets. When I run either of these data sets with the likelihood option...
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