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Cosmology Forum

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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I Brian Cox and the end of the Universe?

Oct 5, 2023 · Replies 13 · May 24, 2024

Replies: 13

Views: 6K

I Latest Findings from DESI Collaboration

Apr 26, 2024 · Replies 2 · May 24, 2024

Replies: 2

Views: 3K

I I'm slightly confused about the power spectrum of matter

May 23, 2024 · Replies 1 · May 24, 2024

Replies: 1

Views: 3K

B Question About Dark Energy

May 23, 2024 · Replies 4 · May 23, 2024

Replies: 4

Views: 3K

I Speed of light on cosmological scales

May 22, 2024 · Replies 9 · May 22, 2024

Replies: 9

Views: 3K

I Cosmological Scalar Field Density Dilution

Apr 8, 2024 · Replies 3 · May 22, 2024

Replies: 3

Views: 3K

A Matter density crude estimates

May 22, 2024 · Replies 2 · May 22, 2024

Replies: 2

Views: 3K

B Percentage of known energy in the Universe

Apr 23, 2024 · Replies 9 · May 21, 2024

Replies: 9

Views: 3K

B Pressure on creation of the Universe

May 19, 2024 · Replies 7 · May 19, 2024

Replies: 7

Views: 3K

B Can the "creation" of space in the Universe affect the speed of light?

Jan 23, 2024 · Replies 7 · May 19, 2024

Replies: 7

Views: 4K

I Global properties of the universe

May 18, 2024 · Replies 10 · May 18, 2024

Replies: 10

Views: 3K

I Can there be structures made from neutrinos with angular momentum?

May 16, 2024 · Replies 18 · May 17, 2024

Replies: 18

Views: 3K

I Do Cosmological Models Influence Quantum Field Theory?

May 17, 2024 · Replies 10 · May 17, 2024

Replies: 10

Views: 3K

B History of CMB, prediction of 1 in 100,000?

May 15, 2024 · Replies 4 · May 16, 2024

Replies: 4

Views: 3K

B Expansion of the Universe

May 10, 2024 · Replies 9 · May 11, 2024

Replies: 9

Views: 3K

I Post Big Bang Gravity

May 7, 2024 · Replies 11 · May 8, 2024

Replies: 11

Views: 3K

B Big Crunch in an infinite, symmetrical, Newtonian universe?

Apr 25, 2024 · Replies 10 · Apr 29, 2024

Replies: 10

Views: 3K

I Question about the big bang singularity

Dec 7, 2022 · Replies 13 · Apr 22, 2024

Replies: 13

Views: 5K

I Questions about the accelerating Hubble expansion

Apr 21, 2024 · Replies 36 · Apr 21, 2024

2

Replies: 36

Views: 5K

I Has JWST solved the crisis in cosmology?

Apr 15, 2024 · Replies 2 · Apr 15, 2024

Replies: 2

Views: 3K

I Inflationary vs deflationary phase of Big Bang

Apr 13, 2024 · Replies 10 · Apr 14, 2024

Replies: 10

Views: 3K

I Meaning of the distance between galactic objects in GR

Apr 10, 2024 · Replies 9 · Apr 12, 2024

Replies: 9

Views: 3K

B Matter-antimatter asymmetry - a simple explanation?

Nov 18, 2022 · Replies 12 · Apr 9, 2024

Replies: 12

Views: 4K

I Expanding Universe without dark energy

Apr 8, 2024 · Replies 3 · Apr 8, 2024

Replies: 3

Views: 3K

B Dark energy might not be constant after all

Apr 5, 2024 · Replies 6 · Apr 7, 2024

Replies: 6

Views: 4K

I Is there an equivalent "redshift" for cosmic rays due to expansion?

Apr 1, 2024 · Replies 14 · Apr 5, 2024

Replies: 14

Views: 3K

I The Evolution of Galactic Scale Cosmic Voids

Mar 12, 2024 · Replies 1 · Apr 5, 2024

Replies: 1

Views: 3K

A What is the maximal comoving distance that a space probe can reach?

Apr 5, 2024 · Replies 1 · Apr 5, 2024

Replies: 1

Views: 2K

I Vacuum up-tunneling with high-energy events?

Apr 2, 2024 · Replies 0 · Apr 2, 2024

Replies: 0

Views: 2K

I Is Vacuum Decay from a False to True State Impossible or Just Unlikely?

Mar 31, 2024 · Replies 2 · Apr 1, 2024

Replies: 2

Views: 3K

A A question from a paper on perturbation theory

Mar 20, 2024 · Replies 1 · Mar 30, 2024

Replies: 1

Views: 2K

A Friedmann-Lemaitre-Robertson-Walker model

Mar 23, 2024 · Replies 9 · Mar 28, 2024

Replies: 9

Views: 2K

I Fourier transform of the density fluctuation

Mar 13, 2024 · Replies 2 · Mar 15, 2024

Replies: 2

Views: 2K

I What is the Freeze-Out Temperature of WIMP Particles?

Mar 10, 2024 · Replies 4 · Mar 13, 2024

Replies: 4

Views: 3K

B Can the force of gravity overcome the Planck force?

Mar 6, 2024 · Replies 11 · Mar 7, 2024

Replies: 11

Views: 3K

B Do we 100% know what the geometry of the Universe is?

Feb 27, 2024 · Replies 38 · Mar 1, 2024

2

Replies: 38

Views: 6K

I Do the Sachs-Wolfe and Rees-Sciama Effects Influence Matter?

Mar 1, 2024 · Replies 0 · Mar 1, 2024

Replies: 0

Views: 2K

I Relationship Between Expansion and Curvature in the Universe

Feb 28, 2024 · Replies 3 · Feb 28, 2024

Replies: 3

Views: 2K

I How Does Curvature Density Parameter Affect Universe Flatness?

Feb 18, 2024 · Replies 9 · Feb 28, 2024

Replies: 9

Views: 3K

B Could Dark Energy be an (unknown) dark force acting at great distances?

Jan 28, 2024 · Replies 7 · Feb 27, 2024

Replies: 7

Views: 3K

B Question about Hawking Radiation and Iron Stars

Feb 23, 2024 · Replies 7 · Feb 25, 2024

Replies: 7

Views: 3K

I Boltzmann equation for annihilation

Feb 12, 2024 · Replies 6 · Feb 22, 2024

Replies: 6

Views: 3K

I Voids, dark energy and tidal forces...?

Feb 13, 2024 · Replies 0 · Feb 13, 2024

Replies: 0

Views: 2K

B Where does the original singularity get its energy from?

Feb 10, 2024 · Replies 10 · Feb 12, 2024

Replies: 10

Views: 3K

A Could Re-Analyzing Redshifts Reveal New Physics?

Feb 8, 2024 · Replies 0 · Feb 8, 2024

Replies: 0

Views: 2K

B Cosmic Graviton Background and Primordial Gravitational Waves

Feb 3, 2024 · Replies 2 · Feb 7, 2024

Replies: 2

Views: 2K

B Observable universe and overlapping spheres

Jan 25, 2024 · Replies 15 · Feb 2, 2024

Replies: 15

Views: 3K

B Dark matter and extreme gravitational regimes

Jan 21, 2024 · Replies 34 · Jan 22, 2024

2

Replies: 34

Views: 3K

I On Quanta article on the recent tensions of cosmology

Jan 22, 2024 · Replies 5 · Jan 22, 2024

Replies: 5

Views: 2K

I Calculating the End of the Universe Using Standard Deviation Statistics

Jan 18, 2024 · Replies 13 · Jan 21, 2024

Replies: 13

Views: 3K

I Mass in an expanding or static spherical distribution of matter

Jan 18, 2024 · Replies 5 · Jan 19, 2024

Replies: 5

Views: 2K

B Is perpetual motion a forbidden topic in the scientific community?

Jan 19, 2024 · Replies 5 · Jan 19, 2024

Replies: 5

Views: 2K

I Questions about the Location of the Big Bang and the Age of the Universe

Jan 18, 2024 · Replies 8 · Jan 19, 2024

Replies: 8

Views: 3K

B Comoving distance constant with increasing redshift?

Jan 18, 2024 · Replies 12 · Jan 18, 2024

Replies: 12

Views: 2K

I How does flux density scale with redshift?

Sep 3, 2017 · Replies 6 · Jan 18, 2024

Replies: 6

Views: 7K

A Numerical evolution of Einstein-Boltzmann equations in cosmology

Jan 18, 2024 · Replies 2 · Jan 18, 2024

Replies: 2

Views: 2K

A Gravitational Instability and accelerated explanation of Universe?

Jan 16, 2024 · Replies 19 · Jan 16, 2024

Replies: 19

Views: 2K

I Photons being blueshifted when crossing evolving voids?

Jan 14, 2024 · Replies 0 · Jan 14, 2024

Replies: 0

Views: 2K

I Falling into a massive black hole is not necessarily noticeable

Jan 12, 2024 · Replies 4 · Jan 13, 2024

Replies: 4

Views: 2K

A What Is the Scale Length in SPARC Data Analysis?

Jan 9, 2024 · Replies 1 · Jan 9, 2024

Replies: 1

Views: 2K

I Big bang at the edges of the Universe?

Nov 4, 2023 · Replies 25 · Jan 7, 2024

Replies: 25

Views: 3K

B What is the Borde-Guth-Vilenkin theorem?

Dec 20, 2017 · Replies 4 · Jan 7, 2024

Replies: 4

Views: 12K

I Does dark-energy require a source of energy?

Jan 4, 2024 · Replies 2 · Jan 5, 2024

Replies: 2

Views: 2K

I Rotation curves and apparent mass of a galaxy

Jan 2, 2024 · Replies 19 · Jan 3, 2024

Replies: 19

Views: 2K

I Is there any mechanism possible for the Big Brake?

Dec 15, 2023 · Replies 4 · Jan 3, 2024

Replies: 4

Views: 2K

I Did James Webb cast serious doubt on the Big Bang?

Nov 28, 2023 · Replies 15 · Dec 23, 2023

Replies: 15

Views: 3K

I Dark energy and the kinematic Sunyaev-Zeldovich effect?

Dec 5, 2023 · Replies 22 · Dec 15, 2023

Replies: 22

Views: 2K

A What is the origin of the Dipole Repeller and similar structures?

Dec 13, 2023 · Replies 1 · Dec 13, 2023

Replies: 1

Views: 1K

A Planck evidence for a closed universe and a crisis for cosmology 2019

Dec 13, 2023 · Replies 0 · Dec 13, 2023

Replies: 0

Views: 1K

I Avoiding structure collapse due to dark energy?

Dec 8, 2023 · Replies 3 · Dec 10, 2023

Replies: 3

Views: 2K

I Why didn't the Big Bang form a Black Hole?

Nov 29, 2023 · Replies 7 · Nov 30, 2023

Replies: 7

Views: 3K

I More extended equilibrium configurations due to dark energy?

Nov 21, 2023 · Replies 19 · Nov 22, 2023

Replies: 19

Views: 2K

I Question on multiple rebrightening gamma ray bursts and gravity waves

Oct 24, 2023 · Replies 9 · Nov 12, 2023

Replies: 9

Views: 2K

A Convention of units for densities in cosmology

Nov 11, 2023 · Replies 0 · Nov 11, 2023

Replies: 0

Views: 1K

I Dark Energy contribution to plasma temperature in galaxy clusters?

Nov 2, 2023 · Replies 7 · Nov 10, 2023

Replies: 7

Views: 2K

I Is Tipler's Theory of Immortality Worth Considering Without Religious Bias?

Oct 19, 2023 · Replies 15 · Nov 4, 2023

Replies: 15

Views: 3K

I Big bang occuring everywhere vs everything "compressed"

Oct 22, 2023 · Replies 16 · Nov 3, 2023

Replies: 16

Views: 3K

I Using GR to predict the shape of the entire universe?

Oct 28, 2023 · Replies 24 · Nov 1, 2023

Replies: 24

Views: 2K

I Understanding Space-Time Expansion: Debunking the Myth of Non-Physical Space

Oct 27, 2023 · Replies 15 · Oct 28, 2023

Replies: 15

Views: 2K

B What value of z (redshift) equals apparent superluminal recession?

Oct 20, 2023 · Replies 28 · Oct 24, 2023

Replies: 28

Views: 3K

I Limitations of Observing Distant Space Objects

Oct 22, 2023 · Replies 38 · Oct 23, 2023

2

Replies: 38

Views: 4K

A Save Time with CLASS Code: Neat Trick for Background Quantity Evolution

Oct 18, 2023 · Replies 0 · Oct 18, 2023

Replies: 0

Views: 1K

I Tidal effects of galaxies orbiting one another with dark energy?

Oct 16, 2023 · Replies 2 · Oct 16, 2023

Replies: 2

Views: 2K

I Why Is a Flat Universe Infinite?

Aug 14, 2023 · Replies 56 · Oct 13, 2023

2

Replies: 56

Views: 6K

I What are P03 procedures or guidelines?

Oct 12, 2023 · Replies 3 · Oct 12, 2023

Replies: 3

Views: 2K

B Roger Penrose model of the rebirthing universe

Jul 25, 2023 · Replies 16 · Oct 11, 2023

Replies: 16

Views: 3K

B How did expansion take 380,000 years to let light travel freely?

Sep 17, 2023 · Replies 13 · Oct 10, 2023

Replies: 13

Views: 3K

I Cosmological expansion of space - question

Mar 5, 2023 · Replies 3 · Oct 10, 2023

Replies: 3

Views: 2K

I Same state as in the Big Bang in a collapsing universe?

Sep 13, 2023 · Replies 2 · Oct 8, 2023

Replies: 2

Views: 2K

I Dark energy contributing to, or modifying, mass estimates?

Sep 28, 2023 · Replies 1 · Sep 28, 2023

Replies: 1

Views: 2K

B The distance to the nearest identical Hubble volume in light years?

Sep 9, 2023 · Replies 50 · Sep 22, 2023

2

Replies: 50

Views: 6K

A Poisson noise on ##a_{\ell m}## complex number: real or complex?

Sep 18, 2023 · Replies 0 · Sep 18, 2023

Replies: 0

Views: 1K

I What was expansion speed at the time of the CMB?

Sep 17, 2023 · Replies 3 · Sep 18, 2023

Replies: 3

Views: 2K

Why is spacetime shown on a 2 dimensional plane?

Dec 8, 2013 · Replies 28 · Sep 9, 2023

Replies: 28

Views: 20K

I The boundary conditions at infinity

Sep 2, 2023 · Replies 41 · Sep 8, 2023

2

Replies: 41

Views: 4K

I Unobservable Universe and the CMBR

Jul 30, 2023 · Replies 22 · Sep 5, 2023

Replies: 22

Views: 3K

I Would there be any way to avoid gravitational wave emissions?

Aug 3, 2023 · Replies 4 · Aug 30, 2023

Replies: 4

Views: 2K

I Role of Dark Matter in the Evolution of Large Scale Structure

Aug 25, 2023 · Replies 9 · Aug 30, 2023

Replies: 9

Views: 2K

I Does the Cosmological Principle in any way underpin Big Bang Theory?

Aug 25, 2023 · Replies 33 · Aug 27, 2023

2

Replies: 33

Views: 3K

I "Quasar clocks" and time running slower long ago

Aug 25, 2023 · Replies 9 · Aug 26, 2023

Replies: 9

Views: 2K

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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