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.
I Cosmological perturbations and CMBR anisotropies
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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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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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I How to calculate the mass within the Hubble Sphere?
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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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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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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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I Will DESI confirm that the Universe isn't described by the ΛCDM model?
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I Questions on the consequence of an evolving dark energy parameter
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I Resolution of Peeble's ODE equation
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  • Featured
I Early large galaxy studies
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I Question about Tong's cosmology lecture notes eqn. 1.19
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I 3 questions about a paper on density fluctuations in the Universe
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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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I Why do we still see the CMB today?
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I Two-dimensional negative curvature space
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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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I Bose-Einstein and Fermionic condensates in space?
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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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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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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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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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I Speed of light on cosmological scales
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I Cosmological Scalar Field Density Dilution
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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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I Cosmology models and QFT
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I Post Big Bang Gravity
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I Question about the big bang singularity
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I Questions about the accelerating Hubble expansion
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I Has JWST solved the crisis in cosmology?
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I Inflationary vs deflationary phase of Big Bang
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I Meaning of the distance between galactic objects in GR
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I Expanding Universe without dark energy
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I Is there an equivalent "redshift" for cosmic rays due to expansion?
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I The Evolution of Galactic Scale Cosmic Voids
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I Vacuum up-tunneling with high-energy events?
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I Is Vacuum Decay from a False to True State Impossible or Just Unlikely?
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I Fourier transform of the density fluctuation
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I What is the Freeze-Out Temperature of WIMP Particles?
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I Do the Sachs-Wolfe and Rees-Sciama Effects Influence Matter?
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I Relationship Between Expansion and Curvature in the Universe
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I How Does Curvature Density Parameter Affect Universe Flatness?
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I Boltzmann equation for annihilation
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I Voids, dark energy and tidal forces...?
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I On Quanta article on the recent tensions of cosmology
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I Calculating the End of the Universe Using Standard Deviation Statistics
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I Mass in an expanding or static spherical distribution of matter
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I Questions about the Location of the Big Bang and the Age of the Universe
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I How does flux density scale with redshift?
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I Photons being blueshifted when crossing evolving voids?
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I Falling into a massive black hole is not necessarily noticeable
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I Big bang at the edges of the Universe?
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I Does dark-energy require a source of energy?
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I Rotation curves and apparent mass of a galaxy
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I Is there any mechanism possible for the Big Brake?
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I Did James Webb cast serious doubt on the Big Bang?
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I Dark energy and the kinematic Sunyaev-Zeldovich effect?
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I Avoiding structure collapse due to dark energy?
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I Why didn't the Big Bang form a Black Hole?
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I More extended equilibrium configurations due to dark energy?
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I Question on multiple rebrightening gamma ray bursts and gravity waves
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I Dark Energy contribution to plasma temperature in galaxy clusters?
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I Is Tipler's Theory of Immortality Worth Considering Without Religious Bias?
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I Big bang occuring everywhere vs everything "compressed"
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I Using GR to predict the shape of the entire universe?
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I Understanding Space-Time Expansion: Debunking the Myth of Non-Physical Space
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I Limitations of Observing Distant Space Objects
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I Tidal effects of galaxies orbiting one another with dark energy?
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I Why Is a Flat Universe Infinite?
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I What are P03 procedures or guidelines?
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I Cosmological expansion of space - question
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I Same state as in the Big Bang in a collapsing universe?
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I Dark energy contributing to, or modifying, mass estimates?
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I What was expansion speed at the time of the CMB?
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I The boundary conditions at infinity
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I Unobservable Universe and the CMBR
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I Would there be any way to avoid gravitational wave emissions?
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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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