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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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A Press Schechter function -- the variance on mass scale

Sep 15, 2017 · Replies 1 · Sep 15, 2017

Replies: 1

Views: 2K

I Dark matter/energy, why must it be there?

Aug 29, 2017 · Replies 30 · Sep 12, 2017

2

Replies: 30

Views: 5K

I Is the speed of gravitational waves non- dispersive?

Sep 12, 2017 · Replies 1 · Sep 12, 2017

Replies: 1

Views: 2K

B Does gravity self interact with itself

Sep 11, 2017 · Replies 7 · Sep 11, 2017

Replies: 7

Views: 3K

B Does this paper disprove the possibility of a new universe creation?

Sep 6, 2017 · Replies 3 · Sep 11, 2017

Replies: 3

Views: 2K

B Does the Expansion of the Universe Affect Gravity?

Aug 30, 2017 · Replies 87 · Sep 9, 2017

3

Replies: 87

Views: 8K

B Expansion Propagation: Finite Seed vs Everywhere?

Sep 8, 2017 · Replies 9 · Sep 9, 2017

Replies: 9

Views: 2K

B How can the Big Bang model apply to the entire universe?

Jul 18, 2017 · Replies 21 · Sep 7, 2017

Replies: 21

Views: 4K

I Understanding the Role of a(t)*dr in Calculating Actual Distance

Aug 30, 2017 · Replies 2 · Sep 1, 2017

Replies: 2

Views: 2K

B Big Bang theory and the known universe

Jun 1, 2017 · Replies 29 · Aug 31, 2017

Replies: 29

Views: 4K

B What is the age of the universe relative to?

May 29, 2017 · Replies 8 · Aug 30, 2017

Replies: 8

Views: 2K

B Did the big bang create something from nothing?

Aug 24, 2017 · Replies 26 · Aug 29, 2017

Replies: 26

Views: 5K

B Is Our Observable Universe the Actual Size of Our Universe?

Aug 17, 2017 · Replies 18 · Aug 29, 2017

Replies: 18

Views: 3K

A Definition of [itex]\sigma_8[/itex]

Aug 25, 2017 · Replies 5 · Aug 26, 2017

Replies: 5

Views: 7K

I Why not detect dark matter in our own galaxy?

Aug 25, 2017 · Replies 12 · Aug 25, 2017

Replies: 12

Views: 2K

B Are Gravitational Waves accepted?

Aug 24, 2017 · Replies 3 · Aug 25, 2017

Replies: 3

Views: 1K

I Observable Universe Size in Different Perspectives

Aug 18, 2017 · Replies 42 · Aug 24, 2017

2

Replies: 42

Views: 6K

B Age of the universe: observable or entire universe?

Aug 9, 2017 · Replies 56 · Aug 21, 2017

2

Replies: 56

Views: 6K

I Hawking radiation from de Sitter horizon

Aug 18, 2017 · Replies 8 · Aug 21, 2017

Replies: 8

Views: 3K

B What if we weren't the only Big Bang

Aug 14, 2017 · Replies 3 · Aug 20, 2017

Replies: 3

Views: 2K

A GADGET2 Simulations: Fixing N-GenIC Error

Aug 17, 2017 · Replies 3 · Aug 18, 2017

Replies: 3

Views: 2K

I Influence of Dark Energy and curvature in photon-baryon fluid?

Aug 17, 2017 · Replies 4 · Aug 17, 2017

Replies: 4

Views: 2K

I How fast is the Universe expanding?

Aug 10, 2017 · Replies 16 · Aug 17, 2017

Replies: 16

Views: 2K

I Why isn't the Planck-scale limit taken as a postulate?

Aug 16, 2017 · Replies 8 · Aug 16, 2017

Replies: 8

Views: 2K

I Is the Planck length a proper length?

Aug 12, 2017 · Replies 6 · Aug 14, 2017

Replies: 6

Views: 2K

I Finding Remnants of the Big Bang

Aug 13, 2017 · Replies 2 · Aug 13, 2017

Replies: 2

Views: 1K

I Dark energy and conservation of energy

Aug 4, 2017 · Replies 20 · Aug 12, 2017

Replies: 20

Views: 3K

B Is there a unity across scale in the universe?

Aug 10, 2017 · Replies 6 · Aug 10, 2017

Replies: 6

Views: 1K

I Perlmutter presentation : pb on the age of the Universe

Aug 6, 2017 · Replies 3 · Aug 6, 2017

Replies: 3

Views: 1K

B How to debunk the idea we are the center of the universe

Aug 2, 2017 · Replies 16 · Aug 4, 2017

Replies: 16

Views: 3K

I IOAA 2nd problems: universe expansion

Aug 3, 2017 · Replies 1 · Aug 3, 2017

Replies: 1

Views: 1K

B How to do the calculations showing the Universe is flat?

Jul 18, 2017 · Replies 52 · Aug 2, 2017

2

Replies: 52

Views: 6K

I Galaxies moving away at the speed of light?

Aug 1, 2017 · Replies 14 · Aug 2, 2017

Replies: 14

Views: 3K

B Angular momentum, degeneracy pressure, and cosmic inflation

Jul 30, 2017 · Replies 6 · Aug 1, 2017

Replies: 6

Views: 2K

B Big Crunch, Big Bang and information loss

Jul 12, 2017 · Replies 56 · Aug 1, 2017

2

Replies: 56

Views: 8K

B Does observation *Determine* the past?

Jul 30, 2017 · Replies 22 · Aug 1, 2017

Replies: 22

Views: 3K

B Pulsar Beams: Spin, Wobble, & Projection

Aug 1, 2017 · Replies 2 · Aug 1, 2017

Replies: 2

Views: 1K

B Why are only hydrogen and helium created

Jul 31, 2017 · Replies 4 · Jul 31, 2017

Replies: 4

Views: 1K

B Do we exist within a singularity

Jul 30, 2017 · Replies 24 · Jul 30, 2017

Replies: 24

Views: 3K

B Why didn't the Universe end up in a huge black hole?

Jul 28, 2017 · Replies 16 · Jul 30, 2017

Replies: 16

Views: 3K

I A copy of me in an infinite universe

Jul 29, 2017 · Replies 3 · Jul 29, 2017

Replies: 3

Views: 5K

I No detection of gravitational radiation

Jul 24, 2017 · Replies 7 · Jul 28, 2017

Replies: 7

Views: 2K

I Planck length and space expansion/contraction

Jul 28, 2017 · Replies 1 · Jul 28, 2017

Replies: 1

Views: 2K

I Why is inflation initial patch length ~ 1 Hubble length ?

Jul 27, 2017 · Replies 2 · Jul 28, 2017

Replies: 2

Views: 2K

I Why the GUT epoch ended at ~10^-36 s ?

Jul 26, 2017 · Replies 6 · Jul 27, 2017

Replies: 6

Views: 2K

I Inflation: meaning of χ (chi) for time scales?

Jul 25, 2017 · Replies 7 · Jul 25, 2017

Replies: 7

Views: 2K

I Inflation lecture from Guth : why does d(ρ)/dt = 0 ?

Jul 24, 2017 · Replies 3 · Jul 24, 2017

Replies: 3

Views: 2K

I Are photons from the CMB being emitted from beyond our cosmological horizon?

Jul 22, 2017 · Replies 6 · Jul 23, 2017

Replies: 6

Views: 2K

I Why hasn't the light from the CMB already passed us?

Jul 20, 2017 · Replies 9 · Jul 21, 2017

Replies: 9

Views: 5K

I The particle horizon value is ignoring inflation?

Jul 20, 2017 · Replies 4 · Jul 20, 2017

Replies: 4

Views: 2K

I What is the C_l in the Fisher Matrix For An CMB Survey?

Jul 17, 2017 · Replies 11 · Jul 18, 2017

Replies: 11

Views: 3K

B Did Mass Exist in the Early Universe Before the Higgs Boson?

Jul 18, 2017 · Replies 5 · Jul 18, 2017

Replies: 5

Views: 2K

A The Big Bang model only deals with the known universe - True or False?

Jul 16, 2017 · Replies 6 · Jul 17, 2017

Replies: 6

Views: 2K

B Could dark matter and dark energy be the same thing?

Jul 15, 2017 · Replies 7 · Jul 16, 2017

Replies: 7

Views: 2K

I Propagation of a light ray : Multiply or not by factor

Jul 4, 2017 · Replies 2 · Jul 14, 2017

Replies: 2

Views: 2K

The Big Bang: Exploding the Myth of a Center in Space and Time

Jul 13, 2017 · Replies 2 · Jul 13, 2017

Replies: 2

Views: 2K

I Understanding the Early Chronology of the Universe

Jul 1, 2017 · Replies 9 · Jul 13, 2017

Replies: 9

Views: 2K

I Equilibrium chaotic environment

Jul 2, 2017 · Replies 2 · Jul 12, 2017

Replies: 2

Views: 1K

A Help With Constraining Parameters in Massive Gravity Action

Jul 8, 2017 · Replies 1 · Jul 10, 2017

Replies: 1

Views: 1K

A Fisher Forecasting For EUCLID Survey Help

Jun 27, 2017 · Replies 10 · Jul 10, 2017

Replies: 10

Views: 2K

I New possible explanation for Hubble redshift

Jul 3, 2017 · Replies 15 · Jul 6, 2017

Replies: 15

Views: 4K

I Radial BAO size method and Hubble parameter

Jul 6, 2017 · Replies 1 · Jul 6, 2017

Replies: 1

Views: 1K

I Don Page - cosmological doomsday argument

Jun 30, 2017 · Replies 9 · Jul 6, 2017

Replies: 9

Views: 2K

B ? about oscillating models of the Universe and Entropy

Jun 30, 2017 · Replies 6 · Jul 3, 2017

Replies: 6

Views: 2K

I Information for black hole region in surface surrounding it

Jul 2, 2017 · Replies 4 · Jul 2, 2017

Replies: 4

Views: 2K

I Black hole - between horizon and singularity

Jul 1, 2017 · Replies 5 · Jul 2, 2017

Replies: 5

Views: 2K

I Black hole - event horizon and Hawking radiation

Jul 1, 2017 · Replies 4 · Jul 2, 2017

Replies: 4

Views: 2K

I What is the Cosmic Microwave Background and how can we observe it today?

Jul 2, 2017 · Replies 7 · Jul 2, 2017

Replies: 7

Views: 2K

I Question on the particles that formed the Earth.

Jul 1, 2017 · Replies 16 · Jul 1, 2017

Replies: 16

Views: 2K

I Infinite Regress: Cosmologists' Answer to the Dilemma

Jun 29, 2017 · Replies 22 · Jul 1, 2017

Replies: 22

Views: 5K

B Measurements on the entire universe

Jun 28, 2017 · Replies 15 · Jul 1, 2017

Replies: 15

Views: 2K

B Is Inertia Tied to the Stars According to Mach's Principle?

Jun 6, 2017 · Replies 67 · Jun 29, 2017

3

Replies: 67

Views: 10K

I Why Does Physical Space Have 3 Dimensions?

Jun 10, 2017 · Replies 2 · Jun 27, 2017

Replies: 2

Views: 2K

I What is the significance of systematic redshift and Mg II in astrophysics?

Jun 27, 2017 · Replies 10 · Jun 27, 2017

Replies: 10

Views: 2K

B Is the concept of a multiverse just science fiction or a scientific possibility?

Jun 19, 2017 · Replies 19 · Jun 26, 2017

Replies: 19

Views: 2K

I Time Scale -- Does Time have uniform Scale?

Jun 24, 2017 · Replies 3 · Jun 24, 2017

Replies: 3

Views: 1K

Insights What Is the Cosmic Background Radiation?

Sep 18, 2015 · Replies 3 · Jun 24, 2017

Replies: 3

Views: 2K

B Nothing, something and the Universe

Jun 23, 2017 · Replies 5 · Jun 23, 2017

Replies: 5

Views: 2K

I Problem interpreting a Distance-Redshift Plot

May 8, 2017 · Replies 55 · Jun 23, 2017

2

Replies: 55

Views: 10K

I Neutrino flavour eigenstates and expansion of the universe

Jun 16, 2017 · Replies 59 · Jun 23, 2017

2

Replies: 59

Views: 5K

I Comoving distance and redshift relationship derivation

Jun 21, 2017 · Replies 6 · Jun 22, 2017

Replies: 6

Views: 6K

I Experimental bound on the scalar spectral index

Jun 21, 2017 · Replies 4 · Jun 21, 2017

Replies: 4

Views: 2K

B Could Our Location in a Supervoid Alter the Hubble and Acceleration Parameters?

Jun 20, 2017 · Replies 1 · Jun 20, 2017

Replies: 1

Views: 2K

I Why Aren't Galaxies Formed After the Big Bang Referred to as Being Further Away?

Jun 14, 2017 · Replies 11 · Jun 20, 2017

Replies: 11

Views: 2K

B Why is the low entropic state of the early universe a puzzle

Jun 11, 2017 · Replies 10 · Jun 19, 2017

Replies: 10

Views: 2K

B Did we just discover the Milky Way is in middle of nowhere?

Jun 8, 2017 · Replies 11 · Jun 16, 2017

Replies: 11

Views: 3K

I Possible retrocausal events and time paradoxes

Jun 14, 2017 · Replies 1 · Jun 14, 2017

Replies: 1

Views: 1K

B Hubble's constant and Minkowski spacetime

Jun 13, 2017 · Replies 10 · Jun 14, 2017

Replies: 10

Views: 2K

I Red shift and the maths for gravity

Jun 12, 2017 · Replies 4 · Jun 12, 2017

Replies: 4

Views: 1K

A How To Do Fisher Forecasting For Constraining Parameters

Jun 9, 2017 · Replies 6 · Jun 11, 2017

Replies: 6

Views: 3K

B Relationship Between Density and the Hubble parameter

Jun 10, 2017 · Replies 5 · Jun 11, 2017

Replies: 5

Views: 3K

B Our solar system and its fellows

Jun 5, 2017 · Replies 9 · Jun 8, 2017

Replies: 9

Views: 2K

B Understanding Re-entry Perturbations After Inflation

Jun 7, 2017 · Replies 6 · Jun 8, 2017

Replies: 6

Views: 2K

B What Drives the Accelerating Expansion of Space?

Jun 6, 2017 · Replies 5 · Jun 6, 2017

Replies: 5

Views: 2K

B Singularities forming universes?

Mar 2, 2017 · Replies 18 · Jun 6, 2017

Replies: 18

Views: 3K

I Why does physical space have to be three-dimensional?

Jun 6, 2017 · Replies 12 · Jun 6, 2017

Replies: 12

Views: 2K

I Does the Planck length expand in a FRW universe?

Jun 5, 2017 · Replies 1 · Jun 5, 2017

Replies: 1

Views: 2K

I What are the alternative theories for the end of the expanding universe?

Dec 29, 2016 · Replies 37 · Jun 5, 2017

2

Replies: 37

Views: 6K

I Life permitting ranges for fine tuning constants

May 31, 2017 · Replies 2 · Jun 1, 2017

Replies: 2

Views: 2K

B Can Primordial Black Holes explain Galaxy formations

May 22, 2017 · Replies 2 · May 30, 2017

Replies: 2

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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