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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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Could Quantum Tunneling from Nothing Equate to the Past or Future?

Mar 13, 2015 · Replies 4 · Mar 15, 2015

Replies: 4

Views: 2K

What does a Cosmological Constant mean?

Feb 18, 2015 · Replies 11 · Mar 15, 2015

Replies: 11

Views: 2K

Could the expansion of space tear us apart?

Mar 7, 2015 · Replies 9 · Mar 14, 2015

Replies: 9

Views: 2K

Dodecahedron universe after PLanck

Mar 14, 2015 · Replies 13 · Mar 14, 2015

Replies: 13

Views: 4K

Dark Matter: Could It Form Structures?

Mar 14, 2015 · Replies 11 · Mar 14, 2015

Replies: 11

Views: 1K

Is MOND still a viable theory for dark matter?

Jan 15, 2014 · Replies 7 · Mar 14, 2015

Replies: 7

Views: 3K

An explanation for hemispherical anisotropy in the CMB?

Mar 13, 2015 · Replies 4 · Mar 14, 2015

Replies: 4

Views: 1K

Is one lifetime too little to learn all about the Universe?

Mar 11, 2015 · Replies 11 · Mar 13, 2015

Replies: 11

Views: 2K

Extremely large Black Hole discovered 900M years after BB

Feb 25, 2015 · Replies 47 · Mar 13, 2015

2

Replies: 47

Views: 6K

Thought Experiment: Where Does the Missing Energy Go?

Jul 8, 2014 · Replies 9 · Mar 13, 2015

Replies: 9

Views: 2K

How does Horava Lifshitz gravity affect the speed of light in bounce solutions?

Mar 12, 2015 · Replies 6 · Mar 13, 2015

Replies: 6

Views: 2K

Scale of perturbations re entropy, in quantum bounce

Mar 6, 2015 · Replies 8 · Mar 13, 2015

Replies: 8

Views: 2K

Is There an Age Problem in the LCDM Cosmological Model?

Mar 12, 2015 · Replies 7 · Mar 12, 2015

Replies: 7

Views: 2K

Several questions about the poincare recurrence time?

Mar 12, 2015 · Replies 5 · Mar 12, 2015

Replies: 5

Views: 2K

Temperature at beginning of Electroweak Epoch?

Mar 10, 2015 · Replies 8 · Mar 12, 2015

Replies: 8

Views: 3K

Why is the universe expanding if its temperature is cooling?

Mar 12, 2015 · Replies 18 · Mar 12, 2015

Replies: 18

Views: 2K

Does the expansion of the universe affect gravitational forces?

Mar 7, 2015 · Replies 17 · Mar 12, 2015

Replies: 17

Views: 2K

Loophole in theory offers insight into the 'lithium problem'

Mar 12, 2015 · Replies 1 · Mar 12, 2015

Replies: 1

Views: 1K

Is Ahmed Hulusi's Theory Supported by Science?

Mar 11, 2015 · Replies 1 · Mar 11, 2015

Replies: 1

Views: 1K

Wave equation given a cosmological inflationary metric

Mar 10, 2015 · Replies 4 · Mar 11, 2015

Replies: 4

Views: 1K

Scott Dodelson Modern Cosmology 4.2

Mar 10, 2015 · Replies 1 · Mar 10, 2015

Replies: 1

Views: 5K

What is the smallest thing discovered in our universe?

Mar 3, 2015 · Replies 27 · Mar 10, 2015

Replies: 27

Views: 7K

The shape of what we can observe?

Mar 10, 2015 · Replies 1 · Mar 10, 2015

Replies: 1

Views: 1K

Missing Matter Problem and Galactic Flows

Mar 5, 2015 · Replies 40 · Mar 9, 2015

2

Replies: 40

Views: 4K

Required backround for quantum cosmology

Mar 3, 2015 · Replies 15 · Mar 8, 2015

Replies: 15

Views: 2K

Is there a subtle symmetry that may not apply in an infinite universe?

Mar 5, 2015 · Replies 7 · Mar 7, 2015

Replies: 7

Views: 2K

Why must singularities create an entire universe?

Mar 6, 2015 · Replies 8 · Mar 6, 2015

Replies: 8

Views: 2K

Why decaying false-vacuum necessary for inflation?

Mar 5, 2015 · Replies 7 · Mar 6, 2015

Replies: 7

Views: 3K

Astronomers Observe Supernova & Find They’re Watching Reruns

Mar 5, 2015 · Replies 2 · Mar 6, 2015

Replies: 2

Views: 1K

Is Dark Matter Truly Dark or Invisible and Can it Form Crystalline Structures?

Feb 26, 2015 · Replies 16 · Mar 6, 2015

Replies: 16

Views: 2K

Are all universes the same age in the Multiverse?

Mar 5, 2015 · Replies 4 · Mar 5, 2015

Replies: 4

Views: 2K

Cosmological principles and their results

Mar 5, 2015 · Replies 3 · Mar 5, 2015

Replies: 3

Views: 1K

Is the Universe Flat or Closed According to WMAP Data?

Mar 4, 2015 · Replies 7 · Mar 4, 2015

Replies: 7

Views: 2K

Closest mass to the line of sight

Mar 3, 2015 · Replies 2 · Mar 4, 2015

Replies: 2

Views: 1K

Is the Boltzmann Brains Problem a Challenge for Eternal Inflation Cosmology?

Mar 3, 2015 · Replies 6 · Mar 4, 2015

Replies: 6

Views: 2K

Can Black Holes Be Utilized for Practical Purposes?

Feb 27, 2015 · Replies 9 · Mar 4, 2015

Replies: 9

Views: 2K

Acceleration a Function of Density, yet Density is Constant?

Mar 1, 2015 · Replies 16 · Mar 4, 2015

Replies: 16

Views: 2K

Why "Dark Energy density" instead of CC?

Mar 3, 2015 · Replies 24 · Mar 3, 2015

Replies: 24

Views: 2K

Is the Universe Still Expanding Faster Than the Speed of Light?

Feb 28, 2015 · Replies 19 · Mar 3, 2015

Replies: 19

Views: 2K

What is the Universe expanding into?

Feb 27, 2015 · Replies 6 · Mar 3, 2015

Replies: 6

Views: 1K

What is the key equation for distance growth in Kindercosmos?

Feb 21, 2015 · Replies 12 · Mar 1, 2015

Replies: 12

Views: 2K

Gravitational Effect of Electromagnetic Radiation

Feb 28, 2015 · Replies 4 · Feb 28, 2015

Replies: 4

Views: 2K

Is the "Big Bang Theory" is on it's last breath?

Feb 27, 2015 · Replies 3 · Feb 27, 2015

Replies: 3

Views: 2K

Distribution of energy after matter/antimatter annihilation

Feb 26, 2015 · Replies 5 · Feb 27, 2015

Replies: 5

Views: 2K

Can Magnets Bend Space-Time and Enable Time Travel?

Feb 26, 2015 · Replies 8 · Feb 26, 2015

Replies: 8

Views: 4K

Shape of Universe - What would a very long stick do

Feb 11, 2015 · Replies 52 · Feb 26, 2015

2

Replies: 52

Views: 4K

Calibration cosmic distance scale on age globular clusters

Feb 25, 2015 · Replies 1 · Feb 25, 2015

Replies: 1

Views: 1K

Gravitational Waves and the Expansion of the Universe: Redshift or Not?

Feb 23, 2015 · Replies 14 · Feb 25, 2015

Replies: 14

Views: 2K

Density Perturbations: Relation to c/H & Scale Invariance

Feb 25, 2015 · Replies 1 · Feb 25, 2015

Replies: 1

Views: 1K

C: "The Big Bang Machine" on Nova: A Critique

Feb 23, 2015 · Replies 7 · Feb 24, 2015

Replies: 7

Views: 1K

Quantum equations suggest the big bang never happened

Feb 10, 2015 · Replies 86 · Feb 24, 2015

3

Replies: 86

Views: 9K

Terminology in structure generating

May 8, 2014 · Replies 25 · Feb 24, 2015

Replies: 25

Views: 3K

Variance and 2 point function in perturbation theory

Feb 9, 2015 · Replies 4 · Feb 23, 2015

Replies: 4

Views: 1K

Is Cosmology a Branch of Physics or Astronomy?

Feb 23, 2015 · Replies 6 · Feb 23, 2015

Replies: 6

Views: 5K

What are the important numbers in Cosmology?

Feb 14, 2015 · Replies 27 · Feb 23, 2015

Replies: 27

Views: 5K

Does Gravitational Lensing Cause Red Shift in Light?

Feb 22, 2015 · Replies 7 · Feb 23, 2015

Replies: 7

Views: 1K

Is Universal Expansion Perceptible to Observers?

Feb 21, 2015 · Replies 5 · Feb 21, 2015

Replies: 5

Views: 1K

3 fates of universe holds for which cosmological fluids?

Dec 29, 2014 · Replies 3 · Feb 21, 2015

Replies: 3

Views: 1K

Why Is the Accelerated Friedmann Equation Giving Incorrect Signs?

Feb 19, 2015 · Replies 7 · Feb 21, 2015

Replies: 7

Views: 2K

Why did dark energy overcome dark matter to create the expanding Universe?

Feb 9, 2015 · Replies 23 · Feb 20, 2015

Replies: 23

Views: 3K

Would the Big Rip make time stop?

Feb 19, 2015 · Replies 2 · Feb 19, 2015

Replies: 2

Views: 1K

Does the amount of matter in the universe stay at a constant amount?

Jan 29, 2015 · Replies 19 · Feb 18, 2015

Replies: 19

Views: 14K

Analyzing Planck Data for No-Scale Supergravity Inflation

Feb 18, 2015 · Replies 5 · Feb 18, 2015

Replies: 5

Views: 2K

Using atomic clocks for gravitational wave detection

Jan 6, 2015 · Replies 9 · Feb 18, 2015

Replies: 9

Views: 2K

Can Galaxy Lensing Confirm Dark Matter's Presence?

Feb 9, 2015 · Replies 10 · Feb 18, 2015

Replies: 10

Views: 2K

In what way is "dark energy" more than "none of the above"?

Jan 30, 2015 · Replies 16 · Feb 17, 2015

Replies: 16

Views: 3K

Simulating dark matter by assuming stable solution

Feb 16, 2015 · Replies 4 · Feb 17, 2015

Replies: 4

Views: 1K

Unpacking the Big Bang: Understanding the Rapid Expansion of Space

Feb 13, 2015 · Replies 9 · Feb 17, 2015

Replies: 9

Views: 2K

Why do people think the universe is finite?

Feb 15, 2015 · Replies 5 · Feb 16, 2015

Replies: 5

Views: 2K

Planckoscope- Visualizing Planck Data

Feb 10, 2015 · Replies 1 · Feb 15, 2015

Replies: 1

Views: 1K

Universe Expansion: Why Objects Move Away Faster The Farther We Look

Feb 7, 2015 · Replies 43 · Feb 14, 2015

2

Replies: 43

Views: 6K

What Is the Connection Between Black Hole Entropy and the Holographic Principle?

Feb 13, 2015 · Replies 5 · Feb 13, 2015

Replies: 5

Views: 2K

Questions Concerning The Planck Epoch

Jan 19, 2015 · Replies 15 · Feb 13, 2015

Replies: 15

Views: 5K

Type Ia Supernova not Standard Candles? I'm confused .

Feb 4, 2015 · Replies 16 · Feb 13, 2015

Replies: 16

Views: 4K

Constraints on Inflation (Planck 2015 results XX)

Feb 7, 2015 · Replies 8 · Feb 12, 2015

Replies: 8

Views: 4K

Is Phi Squared Inflation Compatible with Latest Planck Data?

Feb 10, 2015 · Replies 5 · Feb 12, 2015

Replies: 5

Views: 2K

R.I.P. Dr. Val Fitch, 91. Nobel lauriate cosmologist

Feb 11, 2015 · Replies 1 · Feb 12, 2015

Replies: 1

Views: 1K

Why did Dark Matter have less of an Impact on the Universe

Feb 11, 2015 · Replies 1 · Feb 11, 2015

Replies: 1

Views: 1K

Klein Gordon Equation in Quintessence Models

Feb 5, 2015 · Replies 6 · Feb 10, 2015

Replies: 6

Views: 2K

Boundary for an Infinite "Open" Space

Feb 3, 2015 · Replies 8 · Feb 7, 2015

Replies: 8

Views: 2K

Is the Diffuse Microwave Energy from Galaxies Contributing to CMB Measurements?

Feb 4, 2015 · Replies 17 · Feb 7, 2015

Replies: 17

Views: 3K

Can Quantum Mechanics Explain the Expansion and Contraction of Space-Time?

Jan 30, 2015 · Replies 74 · Feb 7, 2015

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Replies: 74

Views: 12K

What topics are covered in the University of Arizona's Cosmology Video Lectures?

Feb 6, 2015 · Replies 6 · Feb 6, 2015

Replies: 6

Views: 1K

How to measure curvature of 3-sphere from inside its surface

Feb 5, 2015 · Replies 4 · Feb 5, 2015

Replies: 4

Views: 2K

Is all the space there is here now or is space being created

Feb 4, 2015 · Replies 4 · Feb 5, 2015

Replies: 4

Views: 2K

You think there's a multiverse? Get real

Jan 16, 2015 · Replies 71 · Feb 4, 2015

3

Replies: 71

Views: 15K

What Fundamental Force Played a Key Role in the Big Bang?

Jan 30, 2015 · Replies 21 · Feb 3, 2015

Replies: 21

Views: 4K

How Does the CMB Power Spectrum Relate to Angular Scales?

Feb 1, 2015 · Replies 3 · Feb 2, 2015

Replies: 3

Views: 2K

Was the announcement that BICEP2 has detected Inflation Gravity Waves premature?

Nov 21, 2014 · Replies 15 · Feb 1, 2015

Replies: 15

Views: 3K

Is the Big Bang Theory Just a Pseudo-Issue?

Jan 30, 2015 · Replies 12 · Jan 31, 2015

Replies: 12

Views: 2K

Is my reasoning correct? Energy "before" the big bang?

Jan 30, 2015 · Replies 10 · Jan 31, 2015

Replies: 10

Views: 2K

Scenarios for end of the universe

Jan 30, 2015 · Replies 3 · Jan 31, 2015

Replies: 3

Views: 1K

Why was the flat, no Lambda Universe previously favoured?

Jan 29, 2015 · Replies 4 · Jan 30, 2015

Replies: 4

Views: 2K

CMB dipole anisotropies- we are moving towards cmb?

Jan 29, 2015 · Replies 11 · Jan 29, 2015

Replies: 11

Views: 2K

Assumptions in dark-energy density parameter measurement

Jan 29, 2015 · Replies 3 · Jan 29, 2015

Replies: 3

Views: 2K

Natural Spectrum of the Universe?

Jan 27, 2015 · Replies 12 · Jan 28, 2015

Replies: 12

Views: 2K

First cosmology computer simulations

Jan 27, 2015 · Replies 7 · Jan 28, 2015

Replies: 7

Views: 1K

Expansion of the Universe Question

Jan 16, 2015 · Replies 18 · Jan 27, 2015

Replies: 18

Views: 2K

What Makes the Present Moment Special in an Expanding Universe?

Jan 10, 2015 · Replies 28 · Jan 27, 2015

Replies: 28

Views: 3K

Is Space-Time Curvature Just a Force Field?

Jan 7, 2015 · Replies 23 · Jan 27, 2015

Replies: 23

Views: 3K

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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