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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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Event Horizon in a closed, matter (dust) dominated universe

Jan 20, 2015 · Replies 1 · Jan 26, 2015

Replies: 1

Views: 2K

Pre big bang infinite cold inflation?

Jan 23, 2015 · Replies 9 · Jan 26, 2015

Replies: 9

Views: 2K

Thermalized components/virialized

Jan 25, 2015 · Replies 3 · Jan 25, 2015

Replies: 3

Views: 1K

Most total e-folds from inflation

Aug 4, 2014 · Replies 7 · Jan 25, 2015

Replies: 7

Views: 5K

CMB Hemisphere of Evil: Planck Asymmetry Examined

Apr 15, 2013 · Replies 16 · Jan 23, 2015

Replies: 16

Views: 4K

So what is your favourite theory for the beginning of the universe

Jan 22, 2015 · Replies 10 · Jan 22, 2015

Replies: 10

Views: 2K

How massive do neutrinos need to be to account for all dark matter?

Jan 10, 2015 · Replies 24 · Jan 22, 2015

Replies: 24

Views: 3K

Integrated Sachs Wolfe Effect - redshifting?

Jan 21, 2015 · Replies 1 · Jan 21, 2015

Replies: 1

Views: 2K

How did "Visible light" come into existence?

Jan 17, 2015 · Replies 8 · Jan 19, 2015

Replies: 8

Views: 4K

Is Dark Energy a Myth?

Jan 16, 2015 · Replies 17 · Jan 19, 2015

Replies: 17

Views: 2K

Question about the Penrose process

Jan 11, 2015 · Replies 2 · Jan 18, 2015

Replies: 2

Views: 2K

Is it possible to understand inflation through Einstein?

Jan 17, 2015 · Replies 1 · Jan 17, 2015

Replies: 1

Views: 1K

Understand CMB Anisotropies & Interpret Figures

Jan 16, 2015 · Replies 3 · Jan 17, 2015

Replies: 3

Views: 2K

CMB dipole anisotropies & Hubble's Law

Jan 15, 2015 · Replies 10 · Jan 17, 2015

Replies: 10

Views: 3K

Floating in space and angles of galaxies

Jan 16, 2015 · Replies 12 · Jan 16, 2015

Replies: 12

Views: 2K

Anti-matter annihilation and the CMBR

Jan 15, 2015 · Replies 7 · Jan 16, 2015

Replies: 7

Views: 3K

Size of the Observable universe at the Big Bang Singularity

Jan 15, 2015 · Replies 8 · Jan 15, 2015

Replies: 8

Views: 3K

I Simply Cannot Understand Olbers' Paradox -- Finite/Infinite Universe

Jan 14, 2015 · Replies 20 · Jan 15, 2015

Replies: 20

Views: 4K

Is Time Quantized? | Scientific American

Jan 13, 2015 · Replies 2 · Jan 13, 2015

Replies: 2

Views: 1K

How Does Motion Influence Wave Frequency in Doppler Shift?

Jan 13, 2015 · Replies 1 · Jan 13, 2015

Replies: 1

Views: 1K

Velocity of receding galaxies. Hubble <-> scale factor

Jan 11, 2015 · Replies 5 · Jan 12, 2015

Replies: 5

Views: 2K

Why is there an observable universe?

Jan 6, 2015 · Replies 12 · Jan 12, 2015

Replies: 12

Views: 2K

Why does the h tensor represent gravity waves?

Jan 10, 2015 · Replies 7 · Jan 12, 2015

Replies: 7

Views: 1K

Density perturbations made simple

Dec 27, 2014 · Replies 16 · Jan 10, 2015

Replies: 16

Views: 2K

How much matter goes into making black holes?

Jan 9, 2015 · Replies 9 · Jan 10, 2015

Replies: 9

Views: 2K

Question on Smolin's theory on Black Holes and new Universes

Nov 30, 2014 · Replies 35 · Jan 10, 2015

2

Replies: 35

Views: 5K

Massive galaxy cluster could upend theory of universe evolut

Dec 22, 2014 · Replies 6 · Jan 10, 2015

Replies: 6

Views: 2K

WMAP or Planck Maps (cartesian projection)

Jan 8, 2015 · Replies 4 · Jan 9, 2015

Replies: 4

Views: 2K

Did Antimatter Annihilate Matter During the Big Bang?

Dec 28, 2014 · Replies 41 · Jan 9, 2015

2

Replies: 41

Views: 5K

Is Quantum Cosmology a Viable Path to Understanding the Universe?

Jan 8, 2015 · Replies 6 · Jan 8, 2015

Replies: 6

Views: 2K

Is the universe an adiabatic system?

Dec 31, 2014 · Replies 17 · Jan 8, 2015

Replies: 17

Views: 3K

Cosmology: Static Universes and Negative Curvature

Jan 6, 2015 · Replies 4 · Jan 7, 2015

Replies: 4

Views: 1K

Why not an eternal and infinite space?

Jan 3, 2015 · Replies 19 · Jan 7, 2015

Replies: 19

Views: 2K

Will a Rocket Reach a Distant Galaxy Moving Away Due to Space Expansion?

Jan 5, 2015 · Replies 26 · Jan 7, 2015

Replies: 26

Views: 2K

The problem with the "Big Bang" .

Jan 3, 2015 · Replies 22 · Jan 6, 2015

Replies: 22

Views: 3K

How Did Quantum Fluctuations Contribute to the Creation of the Multiverse?

Jan 5, 2015 · Replies 27 · Jan 5, 2015

Replies: 27

Views: 4K

Can Life Exist in the Universe or Multiverse After the Big Crunch?

Jan 4, 2015 · Replies 9 · Jan 5, 2015

Replies: 9

Views: 2K

A Brief History Of Time (Stephen Hawking) FAQs -- Big Bang & Multiverse question

Jan 3, 2015 · Replies 37 · Jan 4, 2015

2

Replies: 37

Views: 4K

Baryon acoustic oscillations and sound horizon

Jan 4, 2015 · Replies 1 · Jan 4, 2015

Replies: 1

Views: 4K

How big does a mass have to be before gravity

Jan 2, 2015 · Replies 4 · Jan 4, 2015

Replies: 4

Views: 1K

Boltzmann equation for the early Universe

Dec 30, 2014 · Replies 10 · Jan 4, 2015

Replies: 10

Views: 4K

Time - How Long was the first second?

Jan 4, 2015 · Replies 5 · Jan 4, 2015

Replies: 5

Views: 1K

Why are there galaxies everywhere we look?

Jan 2, 2015 · Replies 17 · Jan 3, 2015

Replies: 17

Views: 2K

Remind me why FLRW curvature can't switch between cases

Dec 29, 2014 · Replies 5 · Jan 2, 2015

Replies: 5

Views: 1K

Can Small Bangs Create Mini Universes?

Dec 10, 2014 · Replies 4 · Jan 2, 2015

Replies: 4

Views: 1K

Could Dark Matter be composed of neutrons?

Jan 2, 2015 · Replies 5 · Jan 2, 2015

Replies: 5

Views: 3K

Can indirect searches for DM provide insights into candidate particles?

Jan 1, 2015 · Replies 7 · Jan 1, 2015

Replies: 7

Views: 1K

An article on a possible alternative to dark energy

Dec 30, 2014 · Replies 2 · Dec 30, 2014

Replies: 2

Views: 1K

Can Inflation Avoid Selfreproduction?

Dec 8, 2014 · Replies 5 · Dec 29, 2014

Replies: 5

Views: 2K

Steinhardt 16 Dec on inflation (+alts) and spirited debate

Dec 21, 2014 · Replies 3 · Dec 29, 2014

Replies: 3

Views: 2K

Cosmic rest frame, comoving distance, and proper distance

Dec 11, 2014 · Replies 12 · Dec 27, 2014

Replies: 12

Views: 5K

New Planck mission results, Ferrara December 1-5

Dec 2, 2014 · Replies 4 · Dec 27, 2014

Replies: 4

Views: 2K

Where Can You Explore the Universe from Planck Scale to Cosmic Scale?

Dec 24, 2014 · Replies 1 · Dec 24, 2014

Replies: 1

Views: 1K

Expanding Universe: Is Kinetic Energy Behind Acceleration?

Dec 23, 2014 · Replies 8 · Dec 24, 2014

Replies: 8

Views: 2K

Radical new take on *uni*verse questions by Smolin, could be important

Apr 4, 2013 · Replies 237 · Dec 23, 2014

8

Replies: 237

Views: 34K

Question about gravity and the shell theorem

Dec 18, 2014 · Replies 18 · Dec 19, 2014

Replies: 18

Views: 3K

Do quantum fluctuation particles create gravitational effect?

Dec 12, 2014 · Replies 11 · Dec 18, 2014

Replies: 11

Views: 2K

Could Dark Matter Be the Source of Anomalous X-ray Emissions?

Dec 13, 2014 · Replies 4 · Dec 17, 2014

Replies: 4

Views: 2K

Physical meaning of max. proper distance at time of emisson

Dec 15, 2014 · Replies 10 · Dec 17, 2014

Replies: 10

Views: 2K

Energy cannot be created. Then where did it all come from?

Dec 8, 2014 · Replies 70 · Dec 15, 2014

3

Replies: 70

Views: 34K

Why Is the Universe Not Symmetrical?

Dec 11, 2014 · Replies 39 · Dec 14, 2014

2

Replies: 39

Views: 5K

Is the tetrahedron the building block of the universe?

Dec 13, 2014 · Replies 12 · Dec 14, 2014

Replies: 12

Views: 9K

Constants linked to the observable universe, not whole

Dec 6, 2014 · Replies 22 · Dec 14, 2014

Replies: 22

Views: 3K

Understanding Horizon Distance in Axion Cosmology Model

Dec 11, 2014 · Replies 11 · Dec 12, 2014

Replies: 11

Views: 2K

Disappearance of dark matter since the Big Bang

Dec 11, 2014 · Replies 3 · Dec 12, 2014

Replies: 3

Views: 2K

Naive Question regarding Galaxy Rotation Curves

Dec 12, 2014 · Replies 4 · Dec 12, 2014

Replies: 4

Views: 1K

Dark Matter and extra dimensions

Dec 10, 2014 · Replies 12 · Dec 11, 2014

Replies: 12

Views: 2K

Cosmic rest frame, proper distances and comoving distances

Dec 11, 2014 · Replies 1 · Dec 11, 2014

Replies: 1

Views: 2K

Reflect Cosmic Rays: Materials for Mirrors

Nov 28, 2014 · Replies 5 · Dec 11, 2014

Replies: 5

Views: 2K

Field equations Einstein-Gauss-Bonnet action

Dec 8, 2014 · Replies 4 · Dec 8, 2014

Replies: 4

Views: 2K

Is Inflation the Only Solution to the Homogeneity Problem in Cosmology?

Dec 6, 2014 · Replies 8 · Dec 7, 2014

Replies: 8

Views: 2K

Van Flandern's paper on "Speed of Gravity", question.

Nov 27, 2014 · Replies 20 · Dec 7, 2014

Replies: 20

Views: 3K

Expanding universe and thermodynamics

Dec 3, 2014 · Replies 30 · Dec 7, 2014

2

Replies: 30

Views: 3K

Why Are We Here Right Now Instead of Billions of Years Later?

Nov 25, 2014 · Replies 10 · Dec 6, 2014

Replies: 10

Views: 2K

What is the fate of the universe?

Sep 25, 2014 · Replies 20 · Dec 6, 2014

Replies: 20

Views: 2K

What is the correlation between the age and size of the universe?

Dec 6, 2014 · Replies 4 · Dec 6, 2014

Replies: 4

Views: 2K

Smolin dispelling false impressions of the singularity

Dec 6, 2014 · Replies 1 · Dec 6, 2014

Replies: 1

Views: 1K

Is the Weyl Curvature Hypothesis a Viable Alternative to Inflation?

Dec 4, 2014 · Replies 5 · Dec 6, 2014

Replies: 5

Views: 3K

Observational data for evolution of Hubble rate

Dec 4, 2014 · Replies 3 · Dec 5, 2014

Replies: 3

Views: 2K

Anything actually physically infinite within the universe?

Dec 4, 2014 · Replies 4 · Dec 4, 2014

Replies: 4

Views: 2K

Relativistic Degrees of freedom g(T)

Nov 29, 2014 · Replies 9 · Dec 3, 2014

Replies: 9

Views: 3K

Do you know Dragan Hajdukovic's models work?

Dec 3, 2014 · Replies 2 · Dec 3, 2014

Replies: 2

Views: 1K

Can we decrese the timegap of space telsecope images?

Dec 2, 2014 · Replies 6 · Dec 3, 2014

Replies: 6

Views: 1K

Detection of motion of non characterised particles

Dec 2, 2014 · Replies 4 · Dec 2, 2014

Replies: 4

Views: 1K

Simple thought Experiment, Straight Line between 2 Distant Points

Dec 2, 2014 · Replies 7 · Dec 2, 2014

Replies: 7

Views: 1K

Universe's Informational Content and the Big Bang

Dec 1, 2014 · Replies 13 · Dec 1, 2014

Replies: 13

Views: 2K

Saha equation (experiment verification?)

Nov 29, 2014 · Replies 11 · Nov 30, 2014

Replies: 11

Views: 1K

Inflation & Its Effects on Universe's Expansion

Nov 29, 2014 · Replies 4 · Nov 29, 2014

Replies: 4

Views: 1K

The scale factor in flat FRW model

Nov 22, 2014 · Replies 53 · Nov 26, 2014

2

Replies: 53

Views: 7K

How to Measure Perpendicular Peculiar Velocity in Galaxy Simulations?

Nov 23, 2014 · Replies 7 · Nov 24, 2014

Replies: 7

Views: 2K

Entropy of the initital state of the universe

Nov 21, 2014 · Replies 8 · Nov 24, 2014

Replies: 8

Views: 2K

Is Space-Time a Continuum or a Physical Object?

Nov 4, 2014 · Replies 47 · Nov 24, 2014

2

Replies: 47

Views: 7K

If the speed of light was greater, how would it show up?

Nov 22, 2014 · Replies 5 · Nov 23, 2014

Replies: 5

Views: 2K

Why is the Cosmological Redshift z Confusing?

Nov 19, 2014 · Replies 5 · Nov 19, 2014

Replies: 5

Views: 2K

About the effects of relativity when measuring the age of the universe

Nov 19, 2014 · Replies 2 · Nov 19, 2014

Replies: 2

Views: 1K

Is there a boundary present for our universe?

Nov 18, 2014 · Replies 17 · Nov 19, 2014

Replies: 17

Views: 3K

How Is the Age of the Universe Measured Given Relativity and Expansion?

Nov 18, 2014 · Replies 9 · Nov 19, 2014

Replies: 9

Views: 2K

About the size of the Universe and distance between galaxies

Nov 17, 2014 · Replies 12 · Nov 17, 2014

Replies: 12

Views: 3K

How do E Folds relate to real distance?

Nov 17, 2014 · Replies 2 · Nov 17, 2014

Replies: 2

Views: 2K

Does anyone NOT believe heat death is the final destination?

Nov 17, 2014 · Replies 8 · Nov 17, 2014

Replies: 8

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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