Cosmology Forum

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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.
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Insights Intro to Big Bang and Infinity Concepts - Comments
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Insights Equations of State for Photon Gas and Relativistic Electron Gas
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Insights A Journey Into the Cosmos - FLRW Metric and The Friedmann Equation - Comments
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B Matter density right after the decoupling
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B Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo".
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B Inflation after Atacama Cosmology Telescope Results
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B Realism about singularity
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B If the Universe has a cause, what caused that cause?
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I Cosmological perturbations and CMBR anisotropies
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B What is conformal time?
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B Cosmic Microwave Background Stage 4 Cancelled for now
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I Modeling cosmology..
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I No symmetries in the Universe at the Big Bang...?
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B Flatlander analogy of spherical surface as observable universe
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B Conflict between the conservation of matter and the rapid expansion of our universe
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I The impact of early galaxy formation on the CMBR
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I Age of the Universe and the Cosmological Constant
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I Hubble Constant, Dark Energy and the Expanding Universe
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B Big Bang and Infinite Universe
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I How to calculate the mass within the Hubble Sphere?
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A Hubble tension -- any resolution?
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B Harvard's Quiz
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I Dark Matter , Dark energy and the Dirac equation
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I Cosmological Redshift and Expansion
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B Repeating Big Bang
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B Thought experiment to compare the present with the future flow of time
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B Proper time of the observer resting in CMB reference frame
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I How do you get to the conclusion that there is accelerating expansion?
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I Inflation Models that don't produce Multiverse?
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B The most distant object
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B Does an infinite universe contradict a Big Bang origin?
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I Is the amount of dark matter constant in the Universe?
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I If white holes were to exist in our Universe
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A Black Hole TON618 - Wavelength Spectrum
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A Late time and early time approximation for EOS
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I Will DESI confirm that the Universe isn't described by the ΛCDM model?
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B Estimates — True Size of the Universe?
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I Questions on the consequence of an evolving dark energy parameter
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B Dark Matter Theory Endorsed By NASA
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I Resolution of Peeble's ODE equation
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B An old spin to our Universe
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I Early large galaxy studies
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I Question about Tong's cosmology lecture notes eqn. 1.19
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A What does it mean to model the distribution of galaxies as cosmic dust?
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B How do we know if a distant galaxy is matter or anti-matter?
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B Questions about the Eddington Limit and Super - Eddington black holes
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A Models without dark energy
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A Is there a stretching of the light curves of supernovae 1a?
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I 3 questions about a paper on density fluctuations in the Universe
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B Evolution of the Universe in reverse
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A Interpretation of an anticorrelation between 𝐻0 and log10(𝜔𝐵𝐷)
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I The Boundary of the Observable Universe
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I Do particles leave behind an image when crossing cosmo event horizon?
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I How would the laws of thermodynamics change in a contracting universe?
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B Cosmological Redshift in Simulated Universe
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A Form of energy at time of big bang
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I Why do we still see the CMB today?
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A Black hole thermodynamics and accelerated expansion
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I Two-dimensional negative curvature space
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B Redshifts of nearby galaxies
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I The Universe is expanding with acceleration
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I Distance at redshift z=0.666
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A Dark matter is running out of places to hide!
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B Galactic Sheets and Voids
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I Bose-Einstein and Fermionic condensates in space?
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B How can an infinite universe expand?
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I What if the early expansion of the Universe was not so rapid?
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I Does the amount of hidden mass remain constant?
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B Do Fictional Worlds Exist in the Multiverse?
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B Questions about a paper on reconciling JWST and HST data
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I How we are in a matter dominated universe (without antimatter annihilation)
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I Toward the spectral index in slow roll
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I Density fluctuations in a homogeneous linearly expanding universe?
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I What is the reason for density perturbations in the CMB?
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I Question on halos of matter made from massive and stable particles?
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A Celestial objects - older than the CMB
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B Big Bang as the Collapse of a Wave Function
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B Expected Earth-relative velocity of interstellar particles
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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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I Diameter of the observable Universe
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I Is Baryogenesis a Convincing Hypothesis?
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I Could cosmic rays induce a vacuum decay in the future?
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A Is the Jeffry Scale/Bayes Factor Still Used for Testing Inflationary Models?
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B Approximately how long does it take for a galaxy to form?
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B Discussion on the source or cause of Dark Energy Dark Matter et al
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A Horndeski: denominator null implies an infinite quantity
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I Hydrogen line observation frequency range and space Hydrogen speed?
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I What temperature would 1 keV neutrinos have today?
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I "Energy is not conserved" vs. energy is conserved: Friedmann Equations
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I Questions about paper "How closed is cosmology"
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I Brian Cox and the end of the Universe?
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I Latest Findings from DESI Collaboration
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I I'm slightly confused about the power spectrum of matter
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B Question About Dark Energy
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I Speed of light on cosmological scales
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I Cosmological Scalar Field Density Dilution
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A Matter density crude estimates
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B Percentage of known energy in the Universe
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B Pressure on creation of the Universe
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B Can the "creation" of space in the Universe affect the speed of light?
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I Global properties of the universe
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I Can there be structures made from neutrinos with angular momentum?
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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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