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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 Can the Big Bang Occur Without Time?

Jun 30, 2014 · Replies 9 · Jun 30, 2014

Replies: 9

Views: 3K

Boltzmann equation for photons

Jun 30, 2014 · Replies 4 · Jun 30, 2014

Replies: 4

Views: 4K

Discover the Relationship Between CMB's Temperature and Redshift z in Cosmology

Jun 29, 2014 · Replies 9 · Jun 29, 2014

Replies: 9

Views: 4K

Was the expansion of the universe always greater than c?

Jun 20, 2014 · Replies 20 · Jun 28, 2014

Replies: 20

Views: 6K

Scalar field in Expanding Universe EOM

Jun 21, 2014 · Replies 13 · Jun 27, 2014

Replies: 13

Views: 3K

Couldn't the universe be finite if Omega =1?

Jun 6, 2014 · Replies 86 · Jun 27, 2014

3

Replies: 86

Views: 16K

Will the Universe Shrink and Reignite Life?

May 23, 2014 · Replies 21 · Jun 26, 2014

Replies: 21

Views: 7K

Is dimensionless singularity truly dimensionless?

Mar 29, 2014 · Replies 70 · Jun 26, 2014

3

Replies: 70

Views: 17K

Did Matter Exist Before Time? - Hartle-Hawking State

Jun 25, 2014 · Replies 1 · Jun 25, 2014

Replies: 1

Views: 3K

Gerald Shroeder and the age of the universe

Jun 25, 2014 · Replies 6 · Jun 25, 2014

Replies: 6

Views: 3K

Matter vs Anti-Matter: What Survived the Big Bang?

Jan 16, 2014 · Replies 9 · Jun 25, 2014

Replies: 9

Views: 4K

The black Hole Wars - Losing Information in the Hawking Radiation

Jun 23, 2014 · Replies 9 · Jun 24, 2014

Replies: 9

Views: 3K

2-point correlation functions for curvature perturbations

Jun 19, 2014 · Replies 12 · Jun 23, 2014

Replies: 12

Views: 5K

Mass required for a closed universe.

Jun 21, 2014 · Replies 16 · Jun 22, 2014

Replies: 16

Views: 3K

Astronomers Measure Hubble's Constant at 68 km/s/Mpc | Space.com Study

Jun 21, 2014 · Replies 6 · Jun 22, 2014

Replies: 6

Views: 4K

Must (Ve) expansion of the universe be C?

Jun 14, 2014 · Replies 56 · Jun 21, 2014

2

Replies: 56

Views: 10K

Implications of the divisibility of time for the study of the big bang

Jun 20, 2014 · Replies 1 · Jun 20, 2014

Replies: 1

Views: 2K

Final State of the universe 10^ googal plex^ googal?

Jun 19, 2014 · Replies 1 · Jun 19, 2014

Replies: 1

Views: 2K

Simulated Universe: Who or What is the Creator?

Jun 18, 2014 · Replies 1 · Jun 18, 2014

Replies: 1

Views: 2K

Closed Universe? Local H0 Measurements & Relativistic Corrections

Jun 2, 2014 · Replies 4 · Jun 18, 2014

Replies: 4

Views: 3K

DECIGO: Launch Date & Funding Status

Jun 17, 2014 · Replies 4 · Jun 18, 2014

Replies: 4

Views: 2K

Gravitational attraction on the cosmic scale?

Jun 10, 2014 · Replies 42 · Jun 17, 2014

2

Replies: 42

Views: 6K

Is the Universe's Shape Spherical or Hyperbolic?

Jun 17, 2014 · Replies 8 · Jun 17, 2014

Replies: 8

Views: 2K

Is the CMB a Distorted Image of the Early Universe?

Jun 16, 2014 · Replies 8 · Jun 17, 2014

Replies: 8

Views: 2K

BICEP2 & Penrose: Inflation's Impact on Proving Initial Conditions

Jun 11, 2014 · Replies 12 · Jun 16, 2014

Replies: 12

Views: 3K

What do we exactly mean by space is expanding?

Jun 11, 2014 · Replies 47 · Jun 16, 2014

2

Replies: 47

Views: 6K

Is Space Within Atoms Also Stretched by the Big Bang?

Jun 9, 2014 · Replies 25 · Jun 15, 2014

Replies: 25

Views: 4K

Can someone explain why we need inflation?

Jun 12, 2014 · Replies 21 · Jun 14, 2014

Replies: 21

Views: 4K

What if there is no Dark Matter?

Jun 2, 2014 · Replies 11 · Jun 14, 2014

Replies: 11

Views: 3K

Rate of expansion of the universe

Jun 11, 2014 · Replies 4 · Jun 12, 2014

Replies: 4

Views: 3K

Is the expansion accelerating or decelerating?

Jun 11, 2014 · Replies 10 · Jun 11, 2014

Replies: 10

Views: 2K

How Did Scientists Miscalculate the Distance of UDFj-39546284?

Jun 7, 2014 · Replies 16 · Jun 11, 2014

Replies: 16

Views: 3K

Red Shift & Blue Shift: Explained

Jun 9, 2014 · Replies 4 · Jun 9, 2014

Replies: 4

Views: 3K

Concordance value of Hubble growth rate (2014)

Jun 8, 2014 · Replies 3 · Jun 9, 2014

Replies: 3

Views: 2K

Questions on Hubble's law and Friedmann equation

Jun 8, 2014 · Replies 2 · Jun 8, 2014

Replies: 2

Views: 3K

Gamma Ray Burst datasets that consist of distance modulus & redshift

Jun 4, 2014 · Replies 6 · Jun 6, 2014

Replies: 6

Views: 2K

What is the connection between Kolmogorov complexity and randomness?

Jun 4, 2014 · Replies 8 · Jun 6, 2014

Replies: 8

Views: 2K

If the universe is expanding, how can 2 galaxies collide?

Jun 5, 2014 · Replies 6 · Jun 5, 2014

Replies: 6

Views: 2K

Can Space Curve Without Mass or Energy?

Jun 3, 2014 · Replies 18 · Jun 5, 2014

Replies: 18

Views: 3K

Information conservation and Big Bang

May 31, 2014 · Replies 18 · Jun 5, 2014

Replies: 18

Views: 3K

Question concerning density of dark energy

Jun 4, 2014 · Replies 2 · Jun 4, 2014

Replies: 2

Views: 3K

How Does the Velocity of Distant Stars Relate to the Mass of the Universe?

Jun 4, 2014 · Replies 2 · Jun 4, 2014

Replies: 2

Views: 2K

Non-anthropic String Theory Landscape and Finite Universes

May 28, 2014 · Replies 9 · Jun 3, 2014

Replies: 9

Views: 2K

Is the concept of finite mass-energy in the universe outdated?

Jun 2, 2014 · Replies 2 · Jun 2, 2014

Replies: 2

Views: 2K

Friedmann's Acceleration Equation

Jun 1, 2014 · Replies 3 · Jun 2, 2014

Replies: 3

Views: 3K

Is Inflation Eternal Into the Past?

May 31, 2014 · Replies 4 · May 31, 2014

Replies: 4

Views: 2K

DeSitter and AntiDeSitter Universe

May 29, 2014 · Replies 4 · May 31, 2014

Replies: 4

Views: 2K

Conservation of Energy in the Universe at Large

May 17, 2014 · Replies 13 · May 30, 2014

Replies: 13

Views: 3K

Big Rip Compatible with Flat Universe?

May 30, 2014 · Replies 3 · May 30, 2014

Replies: 3

Views: 2K

Did Electrons Form Before Quarks? Chronology of Universe's Reheating Phase

May 29, 2014 · Replies 6 · May 30, 2014

Replies: 6

Views: 3K

Cosmology for Enthusiasts: Understanding Bicep2 Data

May 29, 2014 · Replies 3 · May 30, 2014

Replies: 3

Views: 2K

A few questions about size and shape

May 29, 2014 · Replies 2 · May 29, 2014

Replies: 2

Views: 1K

Baryonic acoustic oscillations and density perturbations

May 28, 2014 · Replies 1 · May 29, 2014

Replies: 1

Views: 2K

Must the curvature of space be constant?

May 12, 2014 · Replies 6 · May 28, 2014

Replies: 6

Views: 3K

Bianchi Models and Kantowski-Sachs

May 26, 2014 · Replies 5 · May 27, 2014

Replies: 5

Views: 2K

CMB and Absolute Rest: Resolving Contradiction

Aug 11, 2011 · Replies 5 · May 27, 2014

Replies: 5

Views: 6K

Finding a constant in an expanding universe

May 24, 2014 · Replies 8 · May 27, 2014

Replies: 8

Views: 2K

What is quintessential inflation and why is it considered fine-tuned?

May 11, 2014 · Replies 16 · May 26, 2014

Replies: 16

Views: 3K

The idea of the universe repeating itself is troubling me

May 25, 2014 · Replies 13 · May 25, 2014

Replies: 13

Views: 4K

Higgs field in the early universe

May 23, 2014 · Replies 25 · May 25, 2014

Replies: 25

Views: 5K

Increasing energy scale in an expanding Universe?

May 24, 2014 · Replies 1 · May 24, 2014

Replies: 1

Views: 2K

Can Black Holes Have Poles Like Planets?

May 23, 2014 · Replies 6 · May 24, 2014

Replies: 6

Views: 2K

The Hawking radiation and information paradox

May 14, 2014 · Replies 3 · May 24, 2014

Replies: 3

Views: 2K

A Definition of hypersurface orthogonal

Oct 9, 2013 · Replies 8 · May 23, 2014

Replies: 8

Views: 10K

Question about the CMB and WMAP

May 22, 2014 · Replies 5 · May 22, 2014

Replies: 5

Views: 2K

Do clocks speed up in an expanding Universe?

May 13, 2014 · Replies 37 · May 21, 2014

2

Replies: 37

Views: 5K

BOSS questions cosmological constant (undecided)

Apr 8, 2014 · Replies 5 · May 21, 2014

Replies: 5

Views: 2K

Expanding universe - energy/information conservation

May 19, 2014 · Replies 8 · May 20, 2014

Replies: 8

Views: 2K

Cosmic Dynamics - Cosmological Constant

May 20, 2014 · Replies 1 · May 20, 2014

Replies: 1

Views: 2K

Is Dark Matter Filling the Universe's Voids?

May 19, 2014 · Replies 30 · May 20, 2014

2

Replies: 30

Views: 5K

A question on the meaning of dark energy

May 15, 2014 · Replies 17 · May 20, 2014

Replies: 17

Views: 3K

Is the universe really expanding?

Mar 12, 2014 · Replies 38 · May 19, 2014

2

Replies: 38

Views: 8K

"Implausibly Large Structure" in the Universe

May 17, 2014 · Replies 3 · May 18, 2014

Replies: 3

Views: 2K

Why does the speed of light never slow down?

May 5, 2014 · Replies 6 · May 14, 2014

Replies: 6

Views: 2K

Will the Cosmos Expand Forever or Collapse?

May 13, 2014 · Replies 5 · May 14, 2014

Replies: 5

Views: 2K

Where does new space come from as the universe gets bigger?

Apr 10, 2014 · Replies 190 · May 12, 2014

7

Replies: 190

Views: 22K

A couple of questions about singularities

May 2, 2014 · Replies 7 · May 12, 2014

Replies: 7

Views: 2K

Can a triple star have a planet around it ?

May 3, 2014 · Replies 6 · May 12, 2014

Replies: 6

Views: 2K

Do heavier elements break down during supernova?

May 10, 2014 · Replies 8 · May 11, 2014

Replies: 8

Views: 2K

From nothing & nowhere to everything.

May 10, 2014 · Replies 10 · May 10, 2014

Replies: 10

Views: 2K

Status of Cosmic Strings and Stringy Inflation

May 9, 2014 · Replies 4 · May 10, 2014

Replies: 4

Views: 2K

Is The Universe A Closed System?

Jul 12, 2012 · Replies 26 · May 10, 2014

Replies: 26

Views: 10K

Dark energy and the CMB cold spot

May 8, 2014 · Replies 2 · May 9, 2014

Replies: 2

Views: 2K

The first realistic virtual universe created

May 7, 2014 · Replies 6 · May 8, 2014

Replies: 6

Views: 2K

How is dark matter distributed in the Milky Way and what effects does it have?

May 3, 2014 · Replies 4 · May 6, 2014

Replies: 4

Views: 3K

Dark energy versus cosmological constant

Apr 29, 2014 · Replies 6 · May 6, 2014

Replies: 6

Views: 3K

Inflation and superluminal expansion

Apr 24, 2014 · Replies 24 · May 5, 2014

Replies: 24

Views: 6K

Conserved charge in FRW expansion

Apr 29, 2014 · Replies 22 · May 5, 2014

Replies: 22

Views: 3K

Calculating the % hydrogen and % helium

May 4, 2014 · Replies 5 · May 5, 2014

Replies: 5

Views: 3K

Cosmological Constant & Fine Tuning for Life

Apr 6, 2014 · Replies 25 · May 5, 2014

Replies: 25

Views: 7K

Something or nothing, which is more supported?

Apr 20, 2014 · Replies 21 · May 4, 2014

Replies: 21

Views: 4K

How is the scale factor related to redshift in the FRW model?

May 2, 2014 · Replies 2 · May 3, 2014

Replies: 2

Views: 4K

Understanding Black Holes: Questions, Equations, and Theories

Jun 25, 2013 · Replies 11 · May 2, 2014

Replies: 11

Views: 3K

Light-cone cosmological simulations

Apr 30, 2014 · Replies 11 · May 1, 2014

Replies: 11

Views: 4K

Question: Expansion of the universe

Apr 30, 2014 · Replies 3 · Apr 30, 2014

Replies: 3

Views: 2K

Why can we see the CMB in every direction we look?

Apr 30, 2014 · Replies 3 · Apr 30, 2014

Replies: 3

Views: 2K

Cosmic inflation and singularity

Apr 28, 2014 · Replies 3 · Apr 29, 2014

Replies: 3

Views: 3K

Questions about the multiverse theory

Apr 28, 2014 · Replies 4 · Apr 29, 2014

Replies: 4

Views: 3K

Can we ask such a question about expansion of universe?

Apr 25, 2014 · Replies 24 · Apr 28, 2014

Replies: 24

Views: 5K

Our attempts at certainty (measurements) actually increase uncertainty

Apr 27, 2014 · Replies 14 · Apr 27, 2014

Replies: 14

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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