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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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B Why does our Universe have more electrons than positrons?

Jul 3, 2020 · Replies 7 · Sep 2, 2020

Replies: 7

Views: 3K

B Dark matter does not interact with ordinary matter....

Sep 1, 2020 · Replies 5 · Sep 1, 2020

Replies: 5

Views: 2K

Binnig's fractal evolution applied to multiple universes?

Aug 27, 2020 · Replies 1 · Aug 31, 2020

Replies: 1

Views: 2K

I Laws Before Big Bang or After Big Bang

Aug 29, 2020 · Replies 1 · Aug 30, 2020

Replies: 1

Views: 2K

B The accelerated expansion of the universe; redshift and time/distance

Aug 28, 2020 · Replies 3 · Aug 29, 2020

Replies: 3

Views: 2K

I What Key Issues Should Cosmologists Address in the ΛCDM Model?

Aug 27, 2020 · Replies 1 · Aug 28, 2020

Replies: 1

Views: 3K

I Why can you not describe massive neutrinos with a temperature?

Aug 23, 2020 · Replies 3 · Aug 23, 2020

Replies: 3

Views: 2K

I How do we observe the CMB at all?

Aug 6, 2020 · Replies 6 · Aug 7, 2020

Replies: 6

Views: 2K

B A Meritable Veritable Time Paradox?

Aug 7, 2020 · Replies 16 · Aug 7, 2020

Replies: 16

Views: 2K

I What proof do we have that the universe is homogenous?

Aug 5, 2020 · Replies 4 · Aug 6, 2020

Replies: 4

Views: 2K

B Low entropy early Universe and the heat death musings

Aug 2, 2020 · Replies 5 · Aug 3, 2020

Replies: 5

Views: 3K

A Can Cosmic Strings Trigger Vacuum Decay?

Jul 15, 2020 · Replies 1 · Aug 2, 2020

Replies: 1

Views: 1K

I How Does The Cosmic Microwave Background Show That The Universe is Expanding?

Jun 28, 2020 · Replies 24 · Jul 25, 2020

Replies: 24

Views: 3K

I Is Negative Dark Energy Density a Valid Concept in Universe Models?

Jul 20, 2020 · Replies 9 · Jul 21, 2020

Replies: 9

Views: 3K

A Exploring Minkowski: A Multi-Dimensional Grid for Studying Other Spaces?

Jul 20, 2020 · Replies 1 · Jul 20, 2020

Replies: 1

Views: 1K

I Meaning of the inertial energy density

Jul 17, 2020 · Replies 1 · Jul 19, 2020

Replies: 1

Views: 1K

A The Cosmological Principle means infinite Observable Universes

Jul 10, 2020 · Replies 17 · Jul 14, 2020

Replies: 17

Views: 2K

I CMB creation, distance measurement question

Jul 5, 2020 · Replies 7 · Jul 6, 2020

Replies: 7

Views: 2K

B How was the amount of matter in the Universe determined?

Jul 2, 2020 · Replies 18 · Jul 3, 2020

Replies: 18

Views: 2K

B Did energy begin to exist? Can energy exist without space and time?

Jul 2, 2020 · Replies 3 · Jul 2, 2020

Replies: 3

Views: 2K

I Is the backward extrapolation of the expansion of the Universe valid?

Sep 1, 2019 · Replies 49 · Jul 1, 2020

2

Replies: 49

Views: 6K

I How to measure a 21 cm EM wave if it is Doppler shifted?

Jun 29, 2020 · Replies 1 · Jun 29, 2020

Replies: 1

Views: 1K

I Wheeler's Mutability principle and multiple universes?

Jun 17, 2020 · Replies 4 · Jun 27, 2020

Replies: 4

Views: 2K

I If a 4th dimension existed would universe expand anisotropically?

Jun 24, 2020 · Replies 2 · Jun 24, 2020

Replies: 2

Views: 1K

I Discover the Rare Black Neutron Star

Jun 23, 2020 · Replies 3 · Jun 23, 2020

Replies: 3

Views: 2K

B Does the Universe really have to be at least as old as the oldest thing in it?

Jun 20, 2020 · Replies 4 · Jun 21, 2020

Replies: 4

Views: 2K

A Lovelock Theorem & FRW Domain Wall Cosmological Model in f(G) Theory

Jun 19, 2020 · Replies 1 · Jun 19, 2020

Replies: 1

Views: 1K

I Hypothetical Eclipse Calculation

Jun 18, 2020 · Replies 8 · Jun 19, 2020

Replies: 8

Views: 2K

B Quantum total eclipse of the sun?

Jun 18, 2020 · Replies 3 · Jun 18, 2020

Replies: 3

Views: 1K

I Big bounce theory in light of the closed Universe finding

Jun 17, 2020 · Replies 5 · Jun 17, 2020

Replies: 5

Views: 2K

I How Do You Derive Transverse Comoving Distance?

Jun 3, 2020 · Replies 4 · Jun 13, 2020

Replies: 4

Views: 2K

I BICEP2's Mis-Estimation: Was Not CIB Subtraction the Cause?

Jun 9, 2020 · Replies 2 · Jun 9, 2020

Replies: 2

Views: 1K

B What is Consciousness? How does it affect our Physical Universe?

Jun 8, 2020 · Replies 6 · Jun 8, 2020

Replies: 6

Views: 2K

I Mass & Radiation 3D Distribution in the Universe

Jun 2, 2020 · Replies 4 · Jun 7, 2020

Replies: 4

Views: 1K

I If the Universe is closed, is it thereby self-contained as well?

Jun 2, 2020 · Replies 27 · Jun 3, 2020

Replies: 27

Views: 4K

I Is the Universe bigger than we think?

Jun 2, 2020 · Replies 5 · Jun 3, 2020

Replies: 5

Views: 2K

A N-body simulation with varying neutrino mass

May 25, 2020 · Replies 1 · May 28, 2020

Replies: 1

Views: 1K

B Half of the Universe’s ordinary matter may have been found

May 28, 2020 · Replies 3 · May 28, 2020

Replies: 3

Views: 1K

B Lensing Gravitational Waves Like Light?

May 23, 2020 · Replies 4 · May 25, 2020

Replies: 4

Views: 2K

I Conservation of energy in cosmology

May 21, 2020 · Replies 3 · May 22, 2020

Replies: 3

Views: 2K

A How to see if a cosmological model is flat?

May 20, 2020 · Replies 4 · May 21, 2020

Replies: 4

Views: 2K

B Is the Universe Truly Finite According to the Big Bang Theory?

Dec 10, 2019 · Replies 17 · May 12, 2020

Replies: 17

Views: 3K

B How does emergent spacetime work?

Mar 20, 2020 · Replies 34 · May 12, 2020

2

Replies: 34

Views: 4K

I The picture of the Comoving coordinate

May 11, 2020 · Replies 5 · May 12, 2020

Replies: 5

Views: 2K

I Curvature of Space in the Context of Cosmology

May 10, 2020 · Replies 3 · May 11, 2020

Replies: 3

Views: 1K

I What happens when a Neutron Star forms a Black Hole?

May 9, 2020 · Replies 17 · May 11, 2020

Replies: 17

Views: 2K

I Constant Curvature and about its meaning

Sep 22, 2019 · Replies 9 · May 10, 2020

Replies: 9

Views: 3K

I The Cosmological Principle and the Universe

May 7, 2020 · Replies 6 · May 7, 2020

Replies: 6

Views: 2K

I Possible illogicalness of a 3-sphere shape of the Universe's space?

May 6, 2020 · Replies 35 · May 7, 2020

2

Replies: 35

Views: 5K

What percent of the universe is outside of galaxies?

May 3, 2020 · Replies 20 · May 6, 2020

Replies: 20

Views: 2K

I Can the multiverse hypothesis be an explanation for life on Earth?

May 3, 2020 · Replies 7 · May 4, 2020

Replies: 7

Views: 2K

B If the Multiverse is correct why don't they appear inside our own?

May 1, 2020 · Replies 34 · May 3, 2020

2

Replies: 34

Views: 3K

B What Happens When You Fall Into a Black Hole According to Stephen Hawking?

May 2, 2020 · Replies 4 · May 2, 2020

Replies: 4

Views: 2K

I Gauge transformation in cosmological perturbation

Oct 17, 2016 · Replies 4 · Apr 28, 2020

Replies: 4

Views: 3K

Insights Dark Energy Part 3: Fitting the SCP Union 2.1 Supernova Data

Apr 25, 2020 · Replies 0 · Apr 25, 2020

Replies: 0

Views: 2K

Insights Dark Energy Part 1: Einstein-deSitter Cosmology

Apr 7, 2020 · Replies 10 · Apr 21, 2020

Replies: 10

Views: 3K

Insights Dark Energy Part 2: LCDM Cosmology

Apr 21, 2020 · Replies 0 · Apr 21, 2020

Replies: 0

Views: 2K

I Big Bang singularity: can we say anything about its size?

Apr 19, 2020 · Replies 2 · Apr 19, 2020

Replies: 2

Views: 2K

B If the Universe keeps expanding this way, it gets torn apart

Apr 16, 2020 · Replies 19 · Apr 17, 2020

Replies: 19

Views: 2K

I Has the evidence for anisotropy of cosmic acceleration been discussed?

Mar 28, 2020 · Replies 2 · Apr 11, 2020

Replies: 2

Views: 2K

B Meaning of Time / Space axes swapping (for Time)

Apr 6, 2020 · Replies 6 · Apr 7, 2020

Replies: 6

Views: 1K

B Black hole movement with no time......?

Apr 3, 2020 · Replies 10 · Apr 5, 2020

Replies: 10

Views: 2K

I Who was the first to find an initial singularity in GR models of the universe?

Apr 2, 2020 · Replies 7 · Apr 3, 2020

Replies: 7

Views: 2K

Insights The Evolution of the Universe, Cosmic Web and Connections

Mar 30, 2020 · Replies 2 · Apr 1, 2020

Replies: 2

Views: 4K

I Can Dark Matter Exist in Higher Dimensions?

Dec 7, 2019 · Replies 50 · Mar 31, 2020

2

Replies: 50

Views: 6K

I What Does a Negative Value for the Deceleration Parameter Imply in Cosmology?

Mar 29, 2020 · Replies 1 · Mar 29, 2020

Replies: 1

Views: 1K

B Is it possible to see the history of space if it expands faster than light?

Mar 28, 2020 · Replies 4 · Mar 28, 2020

Replies: 4

Views: 2K

I Understanding inflationary cosmology

Mar 24, 2020 · Replies 4 · Mar 27, 2020

Replies: 4

Views: 2K

I Is My Basic Understanding of Universe Expansion Correct?

Mar 25, 2020 · Replies 14 · Mar 25, 2020

Replies: 14

Views: 2K

I Understanding the property of the Comoving Coordinate

Mar 24, 2020 · Replies 6 · Mar 25, 2020

Replies: 6

Views: 2K

I Comoving Reference Frame in Cosmology

Mar 24, 2020 · Replies 2 · Mar 25, 2020

Replies: 2

Views: 2K

A New MOND Simulation: First Galaxy Formation Model in Milgromian Gravity

Feb 8, 2020 · Replies 8 · Mar 24, 2020

Replies: 8

Views: 3K

I Is the Brans-Dicke Vacuum Cosmology Theory Still Relevant?

Mar 22, 2020 · Replies 4 · Mar 23, 2020

Replies: 4

Views: 2K

B What Does it Mean When We Say the Universe is 'Flat'?

Mar 19, 2020 · Replies 3 · Mar 19, 2020

Replies: 3

Views: 2K

I Coordinate dependence of recession velocities

Mar 15, 2020 · Replies 12 · Mar 16, 2020

Replies: 12

Views: 2K

B Possibility of Another Big Bang?

Mar 8, 2020 · Replies 10 · Mar 16, 2020

Replies: 10

Views: 3K

I How Can the Newtonian Spherical Ball Be in Stable Equilibrium?

Mar 13, 2020 · Replies 15 · Mar 14, 2020

Replies: 15

Views: 2K

I Is Big G and Dark Energy Constant Over Time?

Feb 4, 2020 · Replies 38 · Mar 10, 2020

2

Replies: 38

Views: 5K

I How do physicists know that an external world exists?

Mar 8, 2020 · Replies 3 · Mar 8, 2020

Replies: 3

Views: 2K

Inflation and measurement of cosmic bodies

Mar 7, 2020 · Replies 2 · Mar 7, 2020

Replies: 2

Views: 2K

I In the beginning there was.... a black hole?

Feb 12, 2020 · Replies 12 · Feb 21, 2020

Replies: 12

Views: 3K

B Why are there 4 dots in Einstein rings?

Feb 16, 2020 · Replies 11 · Feb 17, 2020

Replies: 11

Views: 2K

B Dark matter that doesn't gravitate?

Feb 15, 2020 · Replies 12 · Feb 15, 2020

Replies: 12

Views: 2K

B How Does Modern Particle Accelerator Energy Density Compare to the Big Bang?

Feb 13, 2020 · Replies 6 · Feb 14, 2020

Replies: 6

Views: 2K

B I don't understand the evidence or possibility of the Big Bang

Feb 11, 2020 · Replies 3 · Feb 11, 2020

Replies: 3

Views: 2K

I Is There really a Hubble Tension?

Nov 18, 2019 · Replies 10 · Feb 7, 2020

Replies: 10

Views: 3K

I Understanding the Age of the Universe

Feb 7, 2020 · Replies 8 · Feb 7, 2020

Replies: 8

Views: 2K

I Finite density at the BB preinflation epoch implies a finite universe?

Jan 29, 2020 · Replies 26 · Jan 31, 2020

Replies: 26

Views: 3K

I Is the Pressure Inside a Black Hole So Intense That Atoms Cannot Hold Form?

Apr 17, 2018 · Replies 21 · Jan 30, 2020

Replies: 21

Views: 3K

B Other lines of evidence for Dark Energy? (Besides supernova data)

Jan 17, 2020 · Replies 18 · Jan 27, 2020

Replies: 18

Views: 2K

A Can there be a lawless universe (according to Hawking)?

Jan 27, 2020 · Replies 1 · Jan 27, 2020

Replies: 1

Views: 2K

I Cosmology in Crisis Podcast by LSST Scientists

Jan 23, 2020 · Replies 3 · Jan 26, 2020

Replies: 3

Views: 2K

I DDO 68: A Young Galaxy Supporting the Steady State Theory

Jan 25, 2020 · Replies 4 · Jan 25, 2020

Replies: 4

Views: 2K

I Does the expanding Universe follow Lorentz contraction?

Jan 18, 2020 · Replies 44 · Jan 24, 2020

2

Replies: 44

Views: 5K

I Dark Energy as repulsive gravity

Jan 18, 2020 · Replies 6 · Jan 21, 2020

Replies: 6

Views: 2K

B Could Earth's Atmosphere Survive a Close Gamma Ray Burst?

Jan 20, 2020 · Replies 1 · Jan 20, 2020

Replies: 1

Views: 2K

B Why The Big Bang banged and didn’t collapsed into a black hole?

Nov 22, 2019 · Replies 49 · Jan 17, 2020

2

Replies: 49

Views: 6K

B Is Dark Energy a Continuous Creation Theory?

Jan 10, 2020 · Replies 14 · Jan 13, 2020

Replies: 14

Views: 2K

I Transformation matrix for an expanding space

Jan 10, 2020 · Replies 54 · Jan 13, 2020

2

Replies: 54

Views: 5K

I What is power suppression in CMB experiments?

Jan 3, 2020 · Replies 4 · Jan 11, 2020

Replies: 4

Views: 1K

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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