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Join in expert discussion on topics revolving around cosmology. Cosmology is the origin, evolution, structure and eventual fate of the universe.
A Celestial objects - older than the CMB
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A HST measures Draco dwarf galaxy over 18 years in DM study
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A Trying to plot a graph of energy densities for radiation and PBHs
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380
A Is the Jeffry Scale/Bayes Factor Still Used for Testing Inflationary Models?
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A Horndeski: denominator null implies an infinite quantity
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A Hubble tension -- any resolution?
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A Matter density crude estimates
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A What is the maximal comoving distance that a space probe can reach?
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A Friedmann-Lemaitre-Robertson-Walker model
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A A question from a paper on perturbation theory
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A Could Re-Analyzing Redshifts Reveal New Physics?
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A Numerical evolution of Einstein-Boltzmann equations in cosmology
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A Gravitational Instability and accelerated explanation of Universe?
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A What Is the Scale Length in SPARC Data Analysis?
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A What is the origin of the Dipole Repeller and similar structures?
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A Planck evidence for a closed universe and a crisis for cosmology 2019
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A Convention of units for densities in cosmology
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A Save Time with CLASS Code: Neat Trick for Background Quantity Evolution
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A Poisson noise on ##a_{\ell m}## complex number: real or complex?
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A Largest Galaxy In An Infinite Universe
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A Has anyone read this new paper on extending the BGV?
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A Help with IPTA Gravitational Waveforms Detected
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A Evolution of radio sources mimics a non-expanding universe
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A Mass density of radiation in Friedmann equation?
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A Is M_{Pl} the Planck mass or the reduced Planck mass?
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A Updated Hubble constant from TRGB measurements
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A Scalar Field Dynamics in Inflation
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A Is there a way to convert distance modulus to get H(z) values
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A What does the TE CMB spectrum reveal?
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A New paper claims there is evidence of suppression of structure growth
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A Interpreting SDSS extragalactic data in the era of JWST
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A Data on galaxy rotation curves vs visible matter
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A Black hole mass coupled to expansion -- astrophysical source of dark energy?
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A Please help solve the equation in black hole f(R) theories
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A Does WHIM solve the dark matter problem?
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A Coefficient correlation between 2 cosmological probes
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A How to Plot the Light Path in a Space-Time Diagram Using Python?
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A Multiverse and observational evidence?
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A Cosmic Tidal Force: Measuring CTF With Strain Gauge
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A Relation between a_{\ell m} noise and Poisson noise with C_{\ell}
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A Non-minimally coupled inflation — expansion
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A Is the FLRW Metric a Valid Approximation for Our Universe on Large Scales?
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A Understanding distances in Cosmology
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A Peebles Equation for fractional electron density
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A Can Representing Ideas be Possible?
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A Questions: Gott-Li Can a Universe Create Itself?
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A Which galaxies have the best studied evidence for dark matter?
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A Graceful exit of a cosmological inflation model
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A Numerically solving Scalar field coupled to Friedman equation
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A Evaluating an expression for peculiar acceleration
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A What assumptions underlie the proof that singularities are inevitable?
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A Peculiar Acceleration - Understanding an Equation
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A Relativistic Redshift and understanding it's approximation
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A How Do Recent Studies Impact Our Understanding of CMB Anomalies?
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A Deriving EDE Equation: Need Opinions
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A Calculating the variance of integrated Poisson noise on a defined quantity
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A Hubble Tension and Cosmic Acceleration: A measurement artifact?
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A Is this MOND advance a big deal?
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A Photometric Galaxy Clustering Error and Poisson Noise
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A Add factor Δℓ or Δℓ^2 in the variance for integrated Shot noise
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A Cl's : sum into a chi^2 when we have a sum of chi^2
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A Introduction of a factor Δℓ when summing equal distants 𝐶ℓ
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A Is the CMBR interpretation for dark matter a fudge?
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A Relationship between energy density and cosmological constant
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A Did the Universe Begin as Pure Energy?
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A Galaxy statistics calculation in Saslaw's book
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A Analytical expression of Cosmic Variance - Poisson distribution?
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A Relation between Matter Power spectrum and Angular power spectrum
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A Expression of the mean and variance of spectroscopic Shot Noise
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A New Dark Energy Map Challenges Einstein's Theory
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A Cosmological gravitational waves
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A Fourier transform and Cosmic variance - a few precisions
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A Exploring Planck 2015 Results on Power Law Potential Models
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A Angular power spectrum dependence in redshift z and k
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A Calculate variance on the ratio of 2 angular power spectra
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A Looking for sources of information on Black Holes
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A Quintessence field equation of state
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A Distances between observers using the Lightone7 calculator
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A Discrepancy in Jorrie’s LightCone7-2017-02-08 Cosmo-Calculator
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A What are the parameters that are the same in CMB data for multiple models?
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A Combining 2 probes in order to increase Figure of Merit
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A What is the jerk parameter in terms of the Density parameters?
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A Black Holes Formalism: Overview of Misner Sharp Mass
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A An article on Big Bang theory contradictions
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A Demonstration of the Brans-Dicke's Lagrangian
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A How Are 2D and 3D Cross-Correlations Implemented in Large-Scale Surveys?
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A BGV-theorem and Penrose's Conformal Cyclic Cosmology
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A Confusion in Angular diameter distance
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A Are topological defects such as domain walls really discontinuous?
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A Experimental test of shrinking matter theory?
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A Cross correlations with 2 probes: Approximation of a 2D + 3D synthesis
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A Accelerated Hubble expansion -- Is the second derivative positive?
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A Relationship between the angular and 3D power spectra
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A Exploring Minkowski: A Multi-Dimensional Grid for Studying Other Spaces?
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A Can Cosmic Strings Trigger Vacuum Decay?
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A The Cosmological Principle means infinite Observable Universes
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A Lovelock Theorem & FRW Domain Wall Cosmological Model in f(G) Theory
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A N-body simulation with varying neutrino mass
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A How to see if a cosmological model is flat?
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A What Fundamental Invariance Principle is Violated by FSC Anisotropy?
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Cosmology

Cosmology is the scientific study of the large-scale structure, origin, evolution, and ultimate fate of the universe. It seeks to understand the fundamental nature of the cosmos, including the distribution of galaxies, dark matter, dark energy, and the overall geometry of space-time. Cosmologists explore the early moments of the universe, moments after the Big Bang, and employ various observational tools, such as telescopes and satellites, to gather data that informs our understanding of cosmic evolution.

Key concepts in cosmology include the expansion of the universe, cosmic microwave background radiation, and the formation of galaxies and large-scale structures. It is a field that intersects with physics, astronomy, and astrophysics, providing insights into the vast and intricate tapestry of the cosmos.

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