Conservative Constraints on Early Cosmology: an illustration of the Monte Python cosmological parameter inference code

Abstract

Models for the latest stages of the cosmological evolution rely on a less solid theoretical and observational ground than the description of earlier stages like BBN and recombination. As suggested in a previous work by Vonlanthen et al., it is possible to tweak the analysis of CMB data in such way to avoid making assumptions on the late evolution, and obtain robust constraints on "early cosmology parameters". We extend this method in order to marginalise the results over CMB lensing contamination, and present updated results based on recent CMB data. Our constraints on the minimal early cosmology model are weaker than in a standard LCDM analysis, but do not conflict with this model. Besides, we obtain conservative bounds on the effective neutrino number and neutrino mass, showing no hints for extra relativistic degrees of freedom, and proving in a robust way that neutrinos experienced their non-relativistic transition after the time of photon decoupling. This analysis is also an occasion to describe the main features of the new parameter inference code Monte Python, that we release together with this paper. Monte Python is a user-friendly alternative to other public codes like CosmoMC, interfaced with the Boltzmann code class.

18 pages, 4 figures, typos corrected. Code available at http://montepython.net

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• When tension is just a fluctuation: How noisy data affect model comparison
• The arbitrariness of potentials in interacting quintessence models
• Current constraints on cosmological scenarios with very low reheating temperatures
• Bounds on Neutrino Mass in Viscous Cosmology
• Testing a generalized cubic Galileon gravity model with the Coma Cluster
• No Slip CMB
• BE-HaPPY: Bias Emulator for Halo Power Spectrum including massive neutrinos
• A simple parametrisation for coupled dark energy
• LiteBIRD and CMB-S4 Sensitivities to Reheating in Plateau Models of Inflation
• Towards alleviating the $H_0$ and $S_8$ tensions with Early Dark Energy - Dark Matter drag
• Observational bounds on extended minimal theories of massive gravity: New limits on the graviton mass
• Covariance of the redshift-space matter power spectrum after reconstruction
• On general features of warm dark matter with reduced relativistic gas
• Radiative stability and observational constraints on dark energy and modified gravity
• Forecasts on interacting dark energy with standard sirens
• Deconstructing the Planck TT Power Spectrum to Constrain Deviations from $\Lambda$CDM
• Red, Straight, no bends: primordial power spectrum reconstruction from CMB and large-scale structure
• Exploring Mirror Twin Higgs Cosmology with Present and Future Weak Lensing Surveys
• Observational constraints on interacting vacuum energy with linear interactions
• Type Ia supernovae data with scalar-tensor gravity
• Baryon Physics and Tight Coupling Approximation in Boltzmann Codes
• Can decaying dark matter scenarios alleviate both $H_0$ and ${\sigma }_8$ tensions?
• A Test of the Standard Cosmological Model with Geometry and Growth
• CMB seen through random Swiss Cheese
• Testing gravity with gravitational wave friction and gravitational slip
• Was Entropy Conserved between BBN and Recombination?
• From 100 kpc to 10 Gpc: Dark Matter self-interactions before and after DESI
• Bayesian analysis of a Unified Dark Matter model with transition: can it alleviate the $H_0$ tension?
• Modified Gravity Away from a $\Lambda$CDM Background
• Momentum transfer in the dark sector and lensing convergence in upcoming galaxy surveys
• Reconstructing Probability Distributions with Gaussian Processes
• Bayesian methods for fitting Baryon Acoustic Oscillations in the Lyman-$\alpha$ forest
• Cosmology of an Axion-Like Majoron
• Cosmologically viable generalized Einstein-Aether theories
• Kinetically Coupled Scalar Fields Model and Cosmological Tensions
• Role of the Hubble Scale in the Weak Lensing vs. CMB Tension
• Cosmological constraints on the velocity-dependent baryon-dark matter coupling
• Holographic energy density, dark energy sound speed, and tensions in cosmological parameters: $H_0$ and $S_8$
• Enhanced n-body annihilation of dark matter and its indirect signatures
• Forecast on lepton asymmetry from future CMB experiments
• Does the fraction of dark matter diminish with early dark energy?
• Reconstructing a non-linear interaction in the dark sector with cosmological observations
• Cross-Correlation of Far-Infrared Background Anisotropies and CMB Lensing from Herschel and Planck satellites
• Alleviation of anomalies from the non-oscillatory vacuum in loop quantum cosmology
• Cornering Extended Starobinsky Inflation with CMB and SKA
• No slip gravity in light of LISA standard sirens
• Testing the standardizability of, and deriving cosmological constraints from, a new Amati-correlated gamma-ray burst data compilation
• A visual tool for assessing tension-resolving models in the $H_0$-${\sigma }_8$ plane
• Effects of heterogeneous data sets and time-lag measurement techniques on cosmological parameter constraints from MgII and CIV reverberation-mapped quasar data
• Reconstructing the Hubble parameter with future Gravitational Wave missions using Machine Learning
• Fresh Look at Neutrino Self-Interactions With the Lyman-$\alpha$ Forest: Constraints from EFT and PRIYA Simulations
• Testing the growth rate in homogeneous and inhomogeneous interacting vacuum models
• Observational constraints on the fractal cosmology
• Abundance and properties of dark radiation from the cosmic microwave background
• Fast and effortless computation of profile likelihoods using CONNECT
• Comprehensive Constraints on Dark Radiation Injection After BBN
• Cosmological effects of the Galileon term in Scalar-Tensor Theories
• Dissecting kinetically coupled quintessence: phenomenology and observational tests
• A PAge-like Unified Dark Fluid Model
• Optimizing parameter constraints: a new tool for Fisher matrix forecasts
• Using large scale structure data and a halo model to constrain Generalised Dark Matter
• KiDS+VIKING-450: An internal-consistency test for cosmic shear tomography with a colour-based split of source galaxies
• Narrowing down the Hubble tension to the first two rungs of distance ladders
• Free-Streaming Neutrinos and Their Phase Shift in Current and Future CMB Power Spectra
• Self-interacting neutrinos, the Hubble parameter tension, and the Cosmic Microwave Background
• Exploring cosmological imprints of phantom crossing with dynamical dark energy in Horndeski gravity
• Constraints on extended Bekenstein models from cosmological, astrophysical, and local data
• Fast likelihood-free inference in the LSS Stage IV era
• Information geometry in cosmological inference problems
• Dark Matter Cosmology with Varying Viscosity: a Possible Resolution to the $S_8$ Tension
• Coupled Dark Sector Models and Cosmological Tensions
• Measuring the temperature and profiles of Lyman-$\alpha$ absorbers
• Runaway dilaton models: improved constraints from the full cosmological evolution
• Bayesian and frequentist perspectives agree on dynamical dark energy
• Cosmological constraints with the Effective Fluid approach for Modified Gravity
• Forecasts for interacting dark energy with time-dependent momentum exchange
• Exploring neutrino interactions in light of present and upcoming galaxy surveys
• CMB and 21cm bounds on early structure formation boosted by primordial black hole entropy fluctuations
• Constraints on Dark Matter-Photon Coupling in the Presence of Time-Varying Dark Energy
• Bounds on Velocity-Dependent Dark Matter-Baryon Scattering from Large-Scale Structure
• DESIgning concordant distances in the age of precision cosmology: the impact of density fluctuations
• Cosmology and CPT violating neutrinos
• Is it Mixed dark matter or neutrino masses?
• Cosmological Constraints using the newest VLT-KMOS HII Galaxies and the full Planck CMB spectrum
• Entanglement masquerading in the CMB
• Cosmological bounds on neutrino statistics
• Low- and high-redshift H II starburst galaxies obey different luminosity-velocity dispersion relations
• Quintessential Implications of the presence of AdS in the Dark Energy sector
• Effects of anisotropy in an anisotropic extension of $w$CDM model
• Footprints of Doppler and Aberration Effects in CMB Experiments: Statistical and Cosmological Implications
• Can acoustic and axion-like early dark energy still resolve the Hubble tension?
• Spherical Collapse Approach for Non-standard Dark Matter Models and Enhanced Early Galaxy Formation in JWST
• The Effect of $\alpha$-Vacua on the Scalar and Tensor Spectral Indices: Slow-Roll Approximation
• Deep Learning and genetic algorithms for cosmological Bayesian inference speed-up
• Velocity distribution of elliptical galaxies in the framework of Non-local Gravity model
• Directly Probing Neutrino Interactions through CMB Phase Shift Measurements
• Constraints on Late Time Violations of the Equivalence Principle in the Dark Sector
• Late-Time Anisotropy Sourced by a 2-Form Field Non-Minimally Coupled to Cold Dark Matter
• Empirical Validation: Investigating the ${\Lambda }_s$CDM Model with new DESI BAO Observations
• Tachyonic vs Quintessence dark energy: linear perturbations and CMB data
• On tachyonic stability priors for dark energy
• Is there evidence for CIDER in the Universe?
• Trans-Planckian Effects in Warm Inflation
• Evaluating backreaction with the ellipsoidal collapse model
• Cosmological test of an extended quintessence model
• One-loop power spectrum corrections in interacting dark energy cosmologies
• Exploring Early and Late Cosmology with Next Generation Surveys
• Coupling quintessence kinetics to electromagnetism
• Endowing $\mathbf{\Lambda }$ with a dynamic nature: constraints in a spatially curved Universe
• All-sky angular power spectra from cleaned WISE$\times$SuperCOSMOS galaxy number counts
• Scrutinizing coupled vector dark energy in light of data
• Updated Cosmological Constraints from 2D BAO Measurements: A New Compilation and Comparison with DESI DR2
• Gravitational wave probes of Barrow cosmology with LISA standard sirens
• Impostor Among $\nu$s: Dark Radiation Masquerading as Self-Interacting Neutrinos
• Signatures of Very Early Dark Energy in the Matter Power Spectrum
• Resonant neutrino self-interactions: Insights from the full shape galaxy power spectrum
• Faster cosmological analysis with power spectrum without simulations
• Relaxing cosmological constraints on current neutrino masses
• Cosmological contribution from population III stars in ultracompact minihalos
• Growth of cosmic perturbations in the modified $f(R,T)$ gravity
• $\Lambda$CDM and early dark energy in latent space: a data-driven parametrization of the CMB temperature power spectrum
• Early dark energy in the pre- and post-recombination epochs
• Role of Future SNIa Data from Rubin LSST in Reinvestigating Cosmological Models
• Beyond Fisher Forecasting for Cosmology
• Weak Lensing Constraints on Dark Matter-Baryon Interactions with $N$-Body Simulations and Machine Learning
• Neutrino decays as a natural explanation of the neutrino mass tension
• Population III star explosions and Planck 2018 data
• Stochastic dark matter: Covariant Brownian motion from Planckian discreteness
• Calculating Bayesian evidence for inflationary models using CONNECT
• Dark Matter-Radiation Scattering Enhances CMB Phase Shift through Dark Matter-loading
• Constrain the linear scalar perturbation theory of Cotton gravity
• Imprints of dark matter-massive neutrino interaction in upcoming post-reionization and galaxy surveys
• Testing the consistency of new Amati-correlated gamma-ray burst dataset cosmological constraints with those from better-established cosmological data
• Lensing convergence and anisotropic dark energy in galaxy redshift surveys
• A narrow-band parameterization for the stochastic gravitational wave background
• Interacting dark sector with quadratic coupling: theoretical and observational viability
• Connecting Inflation to the NANOGrav 15-year Data Set via Massive Gravity
• Testing the coupling of dark radiations in light of the Hubble tension
• Common Origin of Warm Dark Matter and Dark Radiation
• A frequentist view on the two-body decaying dark matter model
• Boosting MonteCarlo sampling with a non-Gaussian fit
• False vacuum energy dominated inflation with large $r$ and the importance of ${\kappa }_s$
• A convolutional-neural-network estimator of CMB constraints on dark matter energy injection
• Stage IV CMB forecasts for warm inflation
• ${\mathbf{\Omega }}_1{\mathbf{\Omega }}_2$-$\mathbf{\Lambda }$CDM: A promising phenomenological extension of the standard model of cosmology
• Bayesian analysis for a class of $\alpha$-attractor inflationary models
• Theoretical priors in scalar-tensor cosmologies: Shift-symmetric Horndeski models
• Dark Secrets of Baryons: Illuminating Dark Matter-Baryon Interactions with JWST
• Crosschecking Cosmic Distances from DESI BAO and DES SNe
• Is natural inflation in agreement with CMB data?
• Cosmological Constraints on Neutrino Masses in a Second-Order CPL Dark Energy Model
• Parameter inference with non-linear galaxy clustering: accounting for theoretical uncertainties
• Neutrino Interactions with perturbed Rastall Gravity: A Novel Approach to Reducing the Hubble Tension
• What can we learn about Reionization astrophysical parameters using Gaussian Process Regression?
• CMB Constraints on Loop-Induced Decays of Leptophilic Dark Matter
• Phantom scalar field cosmologies constrained by early cosmic measurements
• Lensing anomalies from the epoch of reionisation
• From Dark Radiation to Dark Energy: Unified Cosmological Evolution in K-essence Models
• On observational signatures of multi-fractional theory
• Dark energy constraints in light of theoretical priors
• Observational constraints on phenomenological emergent dark energy and barotropic dark matter characterized by a constant equation of state parameter
• Probing the Type 3 interacting dark-energy model using matter pairwise velocity
• A New Paradigm for Testing Gravity: Theory-Independent Constraints Using Data From All Astrophysical and Cosmological Scales
• Massive neutrinos and interacting dark matter look alike through the lens of lensing
• Neutrino mass limits and decaying dark matter: background evolution versus perturbations
• Probing Interacting Dark Sectors with upcoming Post-Reionization and Galaxy Surveys
• Probing dynamical embeddings in a five-dimensional spacetime in light of DESI BAO
• Constraining decaying dark matter with BOSS data and the effective field theory of large-scale structures
• Modified Compton Effect and CMB Anisotropy
• WIMP decay as a possible Warm Dark Matter model
• Constraints on the lepton asymmetry from DESI DR2 BAO data
• Thermodynamic parametrization of dark energy
• Momentum transfer models of interacting dark energy
• Selected Topics in Numerical Methods for Cosmology
• New tests of dark sector interactions from the full-shape galaxy power spectrum
• Generalized neutrino isocurvature
• Probing the Inflaton Potential with SKA
• Bayesian evidence and model selection approach for time-dependent dark energy
• Particle production during inflation: A Bayesian analysis with CMB data from Planck 2018
• Testing Scale-Dependent Suppression of Structure Growth in the Linear Regime
• In-depth analysis of the clustering of dark matter particles around primordial black holes. Part III: CMB constraints
• How to embed any likelihood into SBI: Application to Planck + Stage IV galaxy surveys and Dynamical Dark Energy
• APES: Approximate Posterior Ensemble Sampler
• Investigating the Constraints on Primordial Features with Future Cosmic Microwave Background and Galaxy Surveys
• On Validating Angular Power Spectral Models for the Stochastic Gravitational-Wave Background Without Distributional Assumptions
• Constraints on the velocity dispersion of Dark Matter from Cosmology and new bounds on scattering from the Cosmic Dawn