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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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Can the expansion of space affect the speed of light?

May 5, 2015 · Replies 4 · May 5, 2015

Replies: 4

Views: 1K

Uncovering Krauss's Flaws: Analysis of Claims in a Universe from Nothing

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

Replies: 13

Views: 5K

Farthest Object in Universe & Multiverse | Steven

May 4, 2015 · Replies 12 · May 5, 2015

Replies: 12

Views: 3K

Lightcone 1.0 basic redshift article development

May 6, 2013 · Replies 14 · May 5, 2015

Replies: 14

Views: 3K

Big Bang Temperature - What Was It?

May 3, 2015 · Replies 6 · May 4, 2015

Replies: 6

Views: 3K

Am I moving, or is space moving?

May 3, 2015 · Replies 5 · May 3, 2015

Replies: 5

Views: 1K

How many cubic planck lengths are in the observable universe?

May 1, 2015 · Replies 7 · May 3, 2015

Replies: 7

Views: 12K

Are there multiverse models with infinte regress?

May 1, 2015 · Replies 1 · May 2, 2015

Replies: 1

Views: 2K

Simple no-pressure cosmic model gives meaning to Lambda

Apr 3, 2015 · Replies 105 · May 2, 2015

4

Replies: 105

Views: 11K

Observational difference between OS and FLRW

Apr 24, 2015 · Replies 27 · May 1, 2015

Replies: 27

Views: 2K

Do Dark matter and Dark energy interact?

May 1, 2015 · Replies 1 · May 1, 2015

Replies: 1

Views: 2K

How Does the Universe Use Temperature Differences to Create Structures?

Apr 18, 2015 · Replies 80 · Apr 30, 2015

3

Replies: 80

Views: 7K

Is the Multiverse of Cantor Dust a Viable Solution to Olbers' Paradox?

Apr 28, 2015 · Replies 4 · Apr 30, 2015

Replies: 4

Views: 2K

Observing galaxies that recess faster than c

Apr 25, 2015 · Replies 48 · Apr 29, 2015

2

Replies: 48

Views: 5K

How much energy do we need to make an expanding universe?

Apr 27, 2015 · Replies 55 · Apr 29, 2015

2

Replies: 55

Views: 4K

Cold Spot in Cosmic Background Radiation

Apr 29, 2015 · Replies 1 · Apr 29, 2015

Replies: 1

Views: 2K

How Do Gravitational Waves Affect Space-Time?

Apr 25, 2015 · Replies 14 · Apr 28, 2015

Replies: 14

Views: 2K

Marcus's 'no-pressure' model in different jacket

Apr 26, 2015 · Replies 4 · Apr 28, 2015

Replies: 4

Views: 2K

How Do We See The Background Radiation?

Apr 24, 2015 · Replies 9 · Apr 25, 2015

Replies: 9

Views: 1K

Standard candle - in question - affects distance estimates

Apr 11, 2015 · Replies 46 · Apr 24, 2015

2

Replies: 46

Views: 7K

How can BAO and SN constraints be compared for measuring dark energy?

Apr 19, 2015 · Replies 5 · Apr 22, 2015

Replies: 5

Views: 2K

Can a Single Particle Move in an Empty Universe?

Apr 15, 2015 · Replies 8 · Apr 22, 2015

Replies: 8

Views: 2K

How scientists have measured universe?

Apr 9, 2015 · Replies 8 · Apr 22, 2015

Replies: 8

Views: 2K

NASA pictures of dark matter collisions

Mar 27, 2015 · Replies 66 · Apr 21, 2015

3

Replies: 66

Views: 8K

Much ado about (almost) nothing ?

Apr 21, 2015 · Replies 1 · Apr 21, 2015

Replies: 1

Views: 1K

Can a radius of curvature be calulated from omega-k?

Apr 19, 2015 · Replies 1 · Apr 19, 2015

Replies: 1

Views: 1K

Scientists observe potential signs of dark matter

Apr 18, 2015 · Replies 7 · Apr 19, 2015

Replies: 7

Views: 1K

The End of Time: A Dimensionless Universe Explained

Apr 16, 2015 · Replies 9 · Apr 18, 2015

Replies: 9

Views: 3K

Fitting a model to astronomical data

Apr 18, 2015 · Replies 2 · Apr 18, 2015

Replies: 2

Views: 2K

CMB: How Was Matter Distributed Before Photon Decoupling?

Apr 17, 2015 · Replies 8 · Apr 18, 2015

Replies: 8

Views: 2K

Self-Contained Models of Big Bang: Explained for Laymen

Apr 17, 2015 · Replies 3 · Apr 17, 2015

Replies: 3

Views: 1K

Light clocks measure conformal time - detailed argument

Apr 15, 2015 · Replies 12 · Apr 17, 2015

Replies: 12

Views: 2K

Where Did the Emptiness for the Big Bang Come From?

Feb 27, 2015 · Replies 34 · Apr 17, 2015

2

Replies: 34

Views: 4K

How Does Time Expand? 9th Grade Guide

Apr 22, 2008 · Replies 12 · Apr 17, 2015

Replies: 12

Views: 4K

Equilibrium at Universe (possible?)

Jan 30, 2015 · Replies 4 · Apr 17, 2015

Replies: 4

Views: 2K

Explaining Energy in Cosmological Expansion: A Balloon Analogy

Apr 15, 2015 · Replies 6 · Apr 17, 2015

Replies: 6

Views: 3K

Early CMB Temperature: What Changed?

Jan 1, 2014 · Replies 19 · Apr 16, 2015

Replies: 19

Views: 3K

Is the CMB unique to our galaxy or present in all galaxies?

Apr 16, 2015 · Replies 6 · Apr 16, 2015

Replies: 6

Views: 2K

Studying Astronomy: Struggling with Cosmology Maths

Apr 14, 2015 · Replies 4 · Apr 15, 2015

Replies: 4

Views: 2K

Does the Higgs field mean that space has energy?

Apr 15, 2015 · Replies 2 · Apr 15, 2015

Replies: 2

Views: 1K

What does the abbreviation YP stand for?

Apr 14, 2015 · Replies 4 · Apr 15, 2015

Replies: 4

Views: 2K

Dark Matter Particle: Is Axion the Answer?

Apr 12, 2015 · Replies 23 · Apr 15, 2015

Replies: 23

Views: 4K

Measuring redshift from type 1a supernova

Apr 14, 2015 · Replies 9 · Apr 15, 2015

Replies: 9

Views: 3K

Dark energy and type 1a supernovae?

Apr 9, 2015 · Replies 10 · Apr 14, 2015

Replies: 10

Views: 3K

Is our locally measured time actually conformal time?

Apr 13, 2015 · Replies 6 · Apr 14, 2015

Replies: 6

Views: 1K

A slight confusion regarding dark energy & energy conservation

Apr 8, 2015 · Replies 20 · Apr 14, 2015

Replies: 20

Views: 4K

Is Chaisson's View on Cosmic Evolution and Entropy Mainstream in Physics?

Apr 13, 2015 · Replies 5 · Apr 13, 2015

Replies: 5

Views: 1K

Argument for Grand Design, maybe?

Apr 13, 2015 · Replies 1 · Apr 13, 2015

Replies: 1

Views: 1K

A couple of inflationary problems

Apr 12, 2015 · Replies 2 · Apr 12, 2015

Replies: 2

Views: 1K

Does time expand along with space?

Apr 12, 2015 · Replies 2 · Apr 12, 2015

Replies: 2

Views: 2K

Calculating the age of the universe without a model?

Apr 8, 2015 · Replies 24 · Apr 11, 2015

Replies: 24

Views: 3K

Equation involving H and a re Accerlerating Universe

Mar 26, 2015 · Replies 8 · Apr 10, 2015

Replies: 8

Views: 1K

Are atomic energies increasing as the Universe expands?

Apr 8, 2015 · Replies 2 · Apr 8, 2015

Replies: 2

Views: 1K

Did the universe have a begining?

Apr 7, 2015 · Replies 9 · Apr 7, 2015

Replies: 9

Views: 2K

How is Dark Energy Density Calculated in the Universe?

Apr 2, 2015 · Replies 16 · Apr 7, 2015

Replies: 16

Views: 4K

Does space-time have an energy itself?

Apr 4, 2015 · Replies 59 · Apr 7, 2015

2

Replies: 59

Views: 7K

Should the concept of Falsifiability be abandoned in science?

Apr 2, 2015 · Replies 22 · Apr 7, 2015

Replies: 22

Views: 4K

Why are there stars that are "older than the universe"?

Apr 6, 2015 · Replies 4 · Apr 7, 2015

Replies: 4

Views: 2K

Cosmological vs. Relativistic Doppler Shift

Mar 22, 2015 · Replies 4 · Apr 6, 2015

Replies: 4

Views: 2K

When did relic neutrinos cease being relativistic?

Apr 5, 2015 · Replies 4 · Apr 6, 2015

Replies: 4

Views: 2K

Explanation for similar structures at different scales

Apr 5, 2015 · Replies 2 · Apr 5, 2015

Replies: 2

Views: 1K

Understanding Big R(t) in Astronomy: A Physical Perspective

Apr 3, 2015 · Replies 7 · Apr 4, 2015

Replies: 7

Views: 3K

Is Dark Energy a Misinterpreted Phenomenon?

Apr 3, 2015 · Replies 10 · Apr 4, 2015

Replies: 10

Views: 2K

What's the nothingness that our universe is expanding into?

Mar 24, 2015 · Replies 76 · Apr 3, 2015

3

Replies: 76

Views: 14K

Gravitational entropy in the early universe

Apr 2, 2015 · Replies 7 · Apr 3, 2015

Replies: 7

Views: 2K

Calculating Surface Density of the Universe Using the Shell Model

Mar 27, 2015 · Replies 7 · Apr 2, 2015

Replies: 7

Views: 3K

Friedmann's Assumption: Understanding the Universe's Uniformity

Mar 28, 2015 · Replies 44 · Apr 2, 2015

2

Replies: 44

Views: 5K

Size of observable vs UN-observable Universe, etc

Apr 1, 2015 · Replies 3 · Apr 1, 2015

Replies: 3

Views: 4K

What can you learn about cosmology from Google calculator?

Mar 16, 2015 · Replies 111 · Apr 1, 2015

4

Replies: 111

Views: 12K

Role of quantum mechanics in cosmology

Mar 30, 2015 · Replies 11 · Mar 30, 2015

Replies: 11

Views: 2K

Latest News from the Universe: CDM vs WDM and the Future of Dark Matter Models

Mar 30, 2015 · Replies 5 · Mar 30, 2015

Replies: 5

Views: 2K

Boltzmann equation Kinetic equilibrium (Dodelson)

Mar 25, 2015 · Replies 1 · Mar 30, 2015

Replies: 1

Views: 2K

Analogy for recession of galaxies > the speed of light

Mar 29, 2015 · Replies 8 · Mar 29, 2015

Replies: 8

Views: 2K

Our universe as an expanding sponge that is constantly falling.

Mar 28, 2015 · Replies 6 · Mar 28, 2015

Replies: 6

Views: 2K

Do M or string theory imply a lower limit to size?

Mar 27, 2015 · Replies 4 · Mar 28, 2015

Replies: 4

Views: 1K

Redshift of supernova light curve

Mar 26, 2015 · Replies 10 · Mar 27, 2015

Replies: 10

Views: 2K

Feedback and equilibrium between black holes and galaxies

Mar 25, 2015 · Replies 4 · Mar 27, 2015

Replies: 4

Views: 1K

How can you show the CMB shift parameter?

Mar 24, 2015 · Replies 7 · Mar 27, 2015

Replies: 7

Views: 3K

Covariance betw scalar amplitude & spectral index in Planck?

Mar 23, 2015 · Replies 2 · Mar 26, 2015

Replies: 2

Views: 1K

Cosmological Constant and Vacuum Energy

Mar 25, 2015 · Replies 5 · Mar 25, 2015

Replies: 5

Views: 2K

What does a temporally infinite universe imply?

Mar 25, 2015 · Replies 1 · Mar 25, 2015

Replies: 1

Views: 2K

What supported the singularity during the Big Bang?

Mar 24, 2015 · Replies 7 · Mar 24, 2015

Replies: 7

Views: 3K

Supernova Explosion near a black hole

Mar 23, 2015 · Replies 7 · Mar 24, 2015

Replies: 7

Views: 2K

Static universe, spacetime and the stress-energy tensor

Mar 22, 2015 · Replies 13 · Mar 24, 2015

Replies: 13

Views: 2K

Please explain the statement "the big bang happened everywhere at once"

Nov 11, 2014 · Replies 154 · Mar 24, 2015

6

Replies: 154

Views: 17K

How do scientists estimate the total energy of the universe?

Mar 23, 2015 · Replies 15 · Mar 24, 2015

Replies: 15

Views: 3K

What are Branes? Explained Simply

Jan 17, 2015 · Replies 5 · Mar 23, 2015

Replies: 5

Views: 2K

Dark energy and the Cosmological Constant

Mar 15, 2015 · Replies 37 · Mar 23, 2015

2

Replies: 37

Views: 4K

Why are the more distant galaxies/stars moving faster away?

Mar 22, 2015 · Replies 29 · Mar 22, 2015

Replies: 29

Views: 8K

Can someone explain what it is meant by a 'Flat Universe'?

Mar 21, 2015 · Replies 25 · Mar 22, 2015

Replies: 25

Views: 4K

How do we know Inflation begin in 10^-35 second?

Mar 21, 2015 · Replies 3 · Mar 21, 2015

Replies: 3

Views: 1K

Could the Universe be Shrinking Instead of Expanding?

Mar 28, 2013 · Replies 22 · Mar 19, 2015

Replies: 22

Views: 5K

The First Three Minutes - Steven Weinberg

Mar 16, 2015 · Replies 8 · Mar 19, 2015

Replies: 8

Views: 2K

What is the evidence for an accelerated expanding universe

Mar 12, 2015 · Replies 22 · Mar 19, 2015

Replies: 22

Views: 3K

The Holographic Principle: Separating Fact from Fiction

Mar 18, 2015 · Replies 3 · Mar 18, 2015

Replies: 3

Views: 2K

Dark Energy Evolution: Is $\Lambda$CDM Model the Best?

Mar 18, 2015 · Replies 1 · Mar 18, 2015

Replies: 1

Views: 1K

Has There Been Further Progress in Shape Dynamics Theory?

Feb 5, 2015 · Replies 12 · Mar 18, 2015

Replies: 12

Views: 2K

Cosmic expansion in quantum gravity

Mar 15, 2015 · Replies 12 · Mar 17, 2015

Replies: 12

Views: 2K

Does the Hubble Parameter Go to Zero as the Universe Expands Forever?

Mar 16, 2015 · Replies 10 · Mar 17, 2015

Replies: 10

Views: 2K

Increase of dark energy with expansion of universe

Mar 13, 2015 · Replies 57 · Mar 16, 2015

2

Replies: 57

Views: 5K

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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