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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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How to find scale factor at recombination?

Apr 30, 2012 · Replies 11 · May 1, 2012

Replies: 11

Views: 6K

What If the Big Bang Was Caused by Another Universe?

Mar 12, 2012 · Replies 10 · Apr 30, 2012

Replies: 10

Views: 3K

Is the Universe Flat or Curved?

Mar 11, 2012 · Replies 38 · Apr 30, 2012

2

Replies: 38

Views: 16K

Linear model uniquely implies a boundary to our Universe?

Apr 25, 2012 · Replies 5 · Apr 29, 2012

Replies: 5

Views: 2K

How do we move around the sun?

Apr 23, 2012 · Replies 16 · Apr 29, 2012

Replies: 16

Views: 4K

Where Does Gravity Originate From and Why Is It So Weak?

Apr 26, 2012 · Replies 13 · Apr 28, 2012

Replies: 13

Views: 23K

What proof do we have that TIME exists?

Mar 15, 2012 · Replies 149 · Apr 28, 2012

5

Replies: 149

Views: 23K

Could Multiple Big Bangs and Dark Energy Explain the Expanding Universe?

Apr 24, 2012 · Replies 21 · Apr 27, 2012

Replies: 21

Views: 5K

CMB Peak Fregenucy (Planck's law vs. Wein's law)

Apr 27, 2012 · Replies 1 · Apr 27, 2012

Replies: 1

Views: 3K

Infinite monkey theorem - question(s)

Apr 22, 2012 · Replies 15 · Apr 27, 2012

Replies: 15

Views: 4K

Do theories of quantum gravity require that space-time is a lattice?

Apr 23, 2012 · Replies 2 · Apr 26, 2012

Replies: 2

Views: 2K

How to calculate CBR lambda vs age of universe?

Apr 24, 2012 · Replies 8 · Apr 26, 2012

Replies: 8

Views: 4K

Was energy already quantized 10^-43 seconds after the Big Bang?

Apr 23, 2012 · Replies 2 · Apr 25, 2012

Replies: 2

Views: 2K

Relationship between expanding universe and time

Apr 21, 2012 · Replies 26 · Apr 25, 2012

Replies: 26

Views: 8K

Could Anti-Dark Energy and Matter Exist in the Universe?

Apr 22, 2012 · Replies 10 · Apr 24, 2012

Replies: 10

Views: 4K

Geometry of Inflationary Universe?

Apr 24, 2012 · Replies 1 · Apr 24, 2012

Replies: 1

Views: 2K

Write a Speech: "Time Waits for No One" & Cosmology

Apr 23, 2012 · Replies 2 · Apr 24, 2012

Replies: 2

Views: 3K

Calculating the direction of the center of the universe?

Aug 10, 2011 · Replies 9 · Apr 24, 2012

Replies: 9

Views: 5K

The Role of Inflation in the Expansion of the Universe

Apr 20, 2012 · Replies 20 · Apr 24, 2012

Replies: 20

Views: 5K

Can we extend our inertial frame globally?

Apr 23, 2012 · Replies 5 · Apr 24, 2012

Replies: 5

Views: 2K

Size of the Universe just after Big Bang

Apr 22, 2012 · Replies 19 · Apr 23, 2012

Replies: 19

Views: 6K

How did elements and building blocks of life arrive on Earth?

Apr 21, 2012 · Replies 6 · Apr 23, 2012

Replies: 6

Views: 7K

Will space always expand when the space has vacuum energy and zero mass?

Apr 23, 2012 · Replies 5 · Apr 23, 2012

Replies: 5

Views: 4K

Why such strange units of measure?

Apr 20, 2012 · Replies 3 · Apr 23, 2012

Replies: 3

Views: 3K

Cosmological redshift alternative explanation?

Apr 22, 2012 · Replies 5 · Apr 22, 2012

Replies: 5

Views: 5K

Big Bang vs Big Crunch: Universe w/No End

Apr 21, 2012 · Replies 2 · Apr 21, 2012

Replies: 2

Views: 3K

What Insights Does the Fourth Dimension Offer About Our Universe?

Apr 21, 2012 · Replies 1 · Apr 21, 2012

Replies: 1

Views: 2K

Why does the expansion of space in a uniform universe only push outward?

Apr 20, 2012 · Replies 1 · Apr 20, 2012

Replies: 1

Views: 2K

Origins of Scale Factor of FRW Metric and Misc Questions of GR Equations

Apr 16, 2012 · Replies 16 · Apr 20, 2012

Replies: 16

Views: 4K

Elements on Earth: Supernova & Planets

Apr 19, 2012 · Replies 6 · Apr 20, 2012

Replies: 6

Views: 4K

Is gravity 'weak' because it leaks into higher dimensions?

Apr 9, 2012 · Replies 32 · Apr 20, 2012

2

Replies: 32

Views: 18K

Is There a Center to the Expanding Universe? And How Does Light Factor In?

Apr 18, 2012 · Replies 8 · Apr 20, 2012

Replies: 8

Views: 3K

Shouldn't we see faster expansion without dark energy

Apr 18, 2012 · Replies 6 · Apr 19, 2012

Replies: 6

Views: 3K

Slightly Modified Olbers Paradox Question

Apr 18, 2012 · Replies 2 · Apr 19, 2012

Replies: 2

Views: 2K

Varying Fine Structure Constant and Vacuum Energy Density

Apr 16, 2012 · Replies 8 · Apr 18, 2012

Replies: 8

Views: 4K

Did quantum degeneracy pressure drive inflation?

Apr 18, 2012 · Replies 2 · Apr 18, 2012

Replies: 2

Views: 2K

How does the Big Bang Theory explain the creation of matter from energy?

Mar 29, 2012 · Replies 51 · Apr 17, 2012

2

Replies: 51

Views: 11K

Are the Three Dimensions of Our Universe Independent?

Apr 17, 2012 · Replies 1 · Apr 17, 2012

Replies: 1

Views: 2K

Can Star Positions Be Accurately Predicted?

Apr 16, 2012 · Replies 6 · Apr 17, 2012

Replies: 6

Views: 3K

Role of triatomic H ion (H3+) in early star formation

Apr 17, 2012 · Replies 1 · Apr 17, 2012

Replies: 1

Views: 2K

Which fraction of the observed CMBR signal is due to some foreground contaminant

Apr 10, 2012 · Replies 20 · Apr 16, 2012

Replies: 20

Views: 5K

Spatial and temporal variation of alpha?

Apr 16, 2012 · Replies 1 · Apr 16, 2012

Replies: 1

Views: 2K

Does Light Really Stop and Turn Back When Reflected?

Apr 15, 2012 · Replies 2 · Apr 16, 2012

Replies: 2

Views: 2K

How is the big bang related to the general theory of relativity?

Apr 16, 2012 · Replies 3 · Apr 16, 2012

Replies: 3

Views: 6K

Can We Adjust Natural Constants to Obtain Stable Atoms in Other 'Multiverses'?

Apr 14, 2012 · Replies 13 · Apr 16, 2012

Replies: 13

Views: 3K

Can Baryon Acoustic Oscillation Accurately Measure the Universe's Expansion?

Apr 8, 2012 · Replies 8 · Apr 16, 2012

Replies: 8

Views: 3K

Obstacles to observing the cosmic neutrino background

Apr 15, 2012 · Replies 1 · Apr 15, 2012

Replies: 1

Views: 2K

Does not receeding of galaxies decrease entropy

Apr 14, 2012 · Replies 1 · Apr 14, 2012

Replies: 1

Views: 2K

Is our universe a geodesically complete manifold?

Apr 12, 2012 · Replies 20 · Apr 13, 2012

Replies: 20

Views: 5K

What is the issue with the concept of a center in the expanding universe?

Apr 7, 2012 · Replies 16 · Apr 13, 2012

Replies: 16

Views: 5K

Universe Expansion: Why Isn't Space Between Atoms Expanding?

Dec 29, 2011 · Replies 28 · Apr 13, 2012

Replies: 28

Views: 7K

What can spectroscopy of this distant galaxy reveal about the universe at z~10?

Apr 12, 2012 · Replies 5 · Apr 13, 2012

Replies: 5

Views: 3K

Can Stars Become Black Holes Without Going Supernova?

Apr 10, 2012 · Replies 6 · Apr 12, 2012

Replies: 6

Views: 4K

Particle creation in an accelerating Universe?

Mar 27, 2012 · Replies 22 · Apr 12, 2012

Replies: 22

Views: 7K

What is the physical significance of the WMAP power spectrum?

Apr 3, 2012 · Replies 10 · Apr 11, 2012

Replies: 10

Views: 7K

Newtonian cosmology vs relativistic cosmology

Apr 11, 2012 · Replies 1 · Apr 11, 2012

Replies: 1

Views: 3K

Energy of photons and the red shift

Apr 10, 2012 · Replies 2 · Apr 11, 2012

Replies: 2

Views: 3K

I have some somewhat detailed questions about inflation, curvature, and entropy

Apr 8, 2012 · Replies 12 · Apr 10, 2012

Replies: 12

Views: 4K

What Lies Beyond the Expanding Universe?

Apr 9, 2012 · Replies 1 · Apr 9, 2012

Replies: 1

Views: 2K

How Do We Distinguish Red Shift Changes Over Time in Distant Objects?

Apr 8, 2012 · Replies 5 · Apr 9, 2012

Replies: 5

Views: 3K

Does the Universe have a Boundary ?

Aug 10, 2007 · Replies 33 · Apr 9, 2012

2

Replies: 33

Views: 33K

What about gravity's relativity?

Apr 2, 2012 · Replies 18 · Apr 8, 2012

Replies: 18

Views: 4K

Where is the center of the universe?

Jan 17, 2012 · Replies 127 · Apr 8, 2012

5

Replies: 127

Views: 24K

Is the total energy of each particle constant in an expanding universe?

Apr 7, 2012 · Replies 2 · Apr 8, 2012

Replies: 2

Views: 3K

What Caused the Flaw in the Singularity that Triggered the Big Bang?

Apr 1, 2012 · Replies 27 · Apr 8, 2012

Replies: 27

Views: 12K

Could Neutrinos Be the Key to Understanding Dark Matter?

Aug 19, 2008 · Replies 47 · Apr 7, 2012

2

Replies: 47

Views: 25K

The Cyclic Model: Multidimenstional Membranes? Where do these come from?

Apr 7, 2012 · Replies 2 · Apr 7, 2012

Replies: 2

Views: 4K

Antineutrinos? Is this a plausible theory?

Apr 7, 2012 · Replies 1 · Apr 7, 2012

Replies: 1

Views: 2K

Mechanism for matter creation in an expanding Universe?

Mar 24, 2012 · Replies 3 · Apr 6, 2012

Replies: 3

Views: 3K

Cosmologists: why the acceptance of any weird theory but god?

Apr 5, 2012 · Replies 14 · Apr 5, 2012

Replies: 14

Views: 4K

Looking for an introduction to eternal inflation

Apr 5, 2012 · Replies 2 · Apr 5, 2012

Replies: 2

Views: 3K

The Impact of Multiple Universes on Big Bangs

Mar 23, 2012 · Replies 9 · Apr 2, 2012

Replies: 9

Views: 3K

What is our perpective, where did it start, and why can we see it?

Apr 1, 2012 · Replies 9 · Apr 2, 2012

Replies: 9

Views: 3K

Is the Universe Finite or Infinite in Space?

Mar 31, 2012 · Replies 33 · Apr 2, 2012

2

Replies: 33

Views: 8K

Half Closed Universe: Is It Finite?

Mar 23, 2012 · Replies 16 · Apr 2, 2012

Replies: 16

Views: 4K

How do we account for all the elements in the Universe?

Apr 1, 2012 · Replies 3 · Apr 2, 2012

Replies: 3

Views: 3K

Rate of universe expansion question

Mar 28, 2012 · Replies 10 · Apr 1, 2012

Replies: 10

Views: 3K

Could dark matter have gamma-ray absorption lines?

Mar 30, 2012 · Replies 3 · Mar 31, 2012

Replies: 3

Views: 3K

Small scale effects of expansion, and 'bound' objects

Mar 29, 2012 · Replies 16 · Mar 30, 2012

Replies: 16

Views: 4K

How do we define 'Earth like planet'

Dec 9, 2011 · Replies 20 · Mar 30, 2012

Replies: 20

Views: 8K

Dark Energy, Dark Matter, and Empty Space

Sep 27, 2011 · Replies 8 · Mar 29, 2012

Replies: 8

Views: 7K

Need help learning about Dark Matter

Mar 27, 2012 · Replies 5 · Mar 29, 2012

Replies: 5

Views: 3K

Does Space Expand? What Do You Think?

Mar 26, 2007 · Replies 176 · Mar 29, 2012

6

Replies: 176

Views: 41K

The meaning of the curvature term

Mar 21, 2012 · Replies 6 · Mar 28, 2012

Replies: 6

Views: 5K

Cosmo calculator-recession speed tutorial

Apr 4, 2007 · Replies 67 · Mar 28, 2012

3

Replies: 67

Views: 30K

Cantor, infinity and cosmology

Mar 21, 2012 · Replies 24 · Mar 28, 2012

Replies: 24

Views: 5K

Hubble's law and cosmological density

Mar 24, 2012 · Replies 20 · Mar 27, 2012

Replies: 20

Views: 5K

Does Creation of Energy in Universe Violate Conservation of Energy?

Mar 21, 2012 · Replies 13 · Mar 27, 2012

Replies: 13

Views: 5K

I understanding the edge of the universe

Mar 19, 2012 · Replies 5 · Mar 26, 2012

Replies: 5

Views: 3K

What Are the Major Conflicts with Standard Cosmology Models?

Nov 6, 2011 · Replies 16 · Mar 25, 2012

Replies: 16

Views: 6K

How Can an Infinite Universe Have Finite Energy?

Mar 20, 2012 · Replies 45 · Mar 25, 2012

2

Replies: 45

Views: 11K

How Can the Big Bang Be Visible Everywhere in the Universe?

Mar 24, 2012 · Replies 7 · Mar 25, 2012

Replies: 7

Views: 3K

Gnawing questions about the Edge of our Universe

Mar 25, 2012 · Replies 4 · Mar 25, 2012

Replies: 4

Views: 3K

Is Anti-Matter Hiding in the Universe as Dark Matter?

Mar 24, 2012 · Replies 3 · Mar 25, 2012

Replies: 3

Views: 2K

Are galaxies moving faster than the speed of light?

Mar 15, 2012 · Replies 46 · Mar 24, 2012

2

Replies: 46

Views: 13K

Where can i find tensor analysis expained physically in simplest words?

Mar 18, 2012 · Replies 8 · Mar 23, 2012

Replies: 8

Views: 5K

Redshift Effect on Absorption/Emission Lines

Mar 16, 2012 · Replies 6 · Mar 22, 2012

Replies: 6

Views: 4K

What is the conflict between General theory of relativity and Quantum theory?

Mar 18, 2012 · Replies 38 · Mar 21, 2012

2

Replies: 38

Views: 20K

Dark Matter Core Defies Explanation

Mar 5, 2012 · Replies 28 · Mar 20, 2012

Replies: 28

Views: 6K

Why don't we see the other dimensions ?

Mar 19, 2012 · Replies 2 · Mar 20, 2012

Replies: 2

Views: 4K

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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