Menu

Navigation

More options

Style variation

Contact us

Cosmology Forum

Join in expert discussion on topics revolving around cosmology. Cosmology is the origin, evolution, structure and eventual fate of the universe.

Filters

B Questions about the origin and evolution of dark energy.

Dec 27, 2016 · Replies 8 · Jan 4, 2017

Replies: 8

Views: 2K

B How can a physical entity be infinite?

Dec 29, 2016 · Replies 28 · Jan 4, 2017

Replies: 28

Views: 3K

B What Do Scientists Think a Black Hole Is?

Dec 21, 2016 · Replies 23 · Jan 4, 2017

Replies: 23

Views: 3K

B Is the Universe infinite or not?

Dec 29, 2016 · Replies 38 · Jan 3, 2017

2

Replies: 38

Views: 6K

I Measuring Time w/o Entropy: Can It Be Done?

Dec 23, 2016 · Replies 22 · Jan 3, 2017

Replies: 22

Views: 4K

B Is the Universe Infinitely Large Since the Big Bang?

Jan 2, 2017 · Replies 1 · Jan 2, 2017

Replies: 1

Views: 2K

I What Does the h Subscript 70 to the Power of 3 Mean in Supernova Units?

Dec 31, 2016 · Replies 4 · Jan 1, 2017

Replies: 4

Views: 1K

I How is the first multipole calculated from the Plank Study?

Dec 25, 2016 · Replies 1 · Dec 31, 2016

Replies: 1

Views: 2K

I Is It Time to Rethink Our Models of Dark Energy and Dark Matter?

Dec 27, 2016 · Replies 2 · Dec 29, 2016

Replies: 2

Views: 1K

I Would quantum laws work in other hypothetical universes?

Dec 27, 2016 · Replies 3 · Dec 27, 2016

Replies: 3

Views: 1K

B Theory that challenges Einstein's physics could soon be put to rest

Nov 28, 2016 · Replies 9 · Dec 27, 2016

Replies: 9

Views: 2K

A Is the Cosmic Microwave Background Linked to Dark Energy?

Dec 24, 2016 · Replies 6 · Dec 27, 2016

Replies: 6

Views: 2K

B Can Hydrogen-Based Plastic Provide Better Radiation Protection than Lead?

Dec 23, 2016 · Replies 4 · Dec 23, 2016

Replies: 4

Views: 1K

B Earth's Radio Bubble: Alien Civilization Unaware of Human Existence

Dec 18, 2016 · Replies 21 · Dec 22, 2016

Replies: 21

Views: 3K

Did the universe Absolutely begin?

Dec 15, 2016 · Replies 47 · Dec 21, 2016

2

Replies: 47

Views: 6K

B Infinite amount of matter in the universe?

Dec 15, 2016 · Replies 53 · Dec 21, 2016

2

Replies: 53

Views: 7K

B Cosmic Rays: How Fast Do They Travel?

Dec 20, 2016 · Replies 8 · Dec 21, 2016

Replies: 8

Views: 2K

B Is There a Limit to the Expansion of the Universe?

Dec 21, 2016 · Replies 2 · Dec 21, 2016

Replies: 2

Views: 1K

B How does black hole merger cause loss of mass?

Dec 16, 2016 · Replies 8 · Dec 20, 2016

Replies: 8

Views: 4K

B What is the true vacuum and does it exist in our expanding universe?

Dec 13, 2016 · Replies 32 · Dec 20, 2016

2

Replies: 32

Views: 6K

Philosophy of a Mathematical Multiverse

Dec 19, 2016 · Replies 1 · Dec 19, 2016

Replies: 1

Views: 1K

I How did scientists figure out the expansion is accelerating?

Dec 19, 2016 · Replies 1 · Dec 19, 2016

Replies: 1

Views: 1K

I Is the Cosmic Void Between Galaxies Truly Empty?

Dec 17, 2016 · Replies 6 · Dec 19, 2016

Replies: 6

Views: 2K

B How can we create a map of the universe?

Dec 17, 2016 · Replies 19 · Dec 19, 2016

Replies: 19

Views: 3K

B Can we detect ancient EMR attenuation from before the recombination epoch?

Dec 14, 2016 · Replies 10 · Dec 18, 2016

Replies: 10

Views: 1K

I How can gravity hold galaxy groups togehter?

Dec 16, 2016 · Replies 5 · Dec 18, 2016

Replies: 5

Views: 2K

B Beyond the standard model through 'mini spirals'

Dec 16, 2016 · Replies 2 · Dec 16, 2016

Replies: 2

Views: 1K

B Is Weak Gravitational Lensing Enough Evidence to Confirm Dark Matter?

Dec 16, 2016 · Replies 2 · Dec 16, 2016

Replies: 2

Views: 1K

B What is the link between ordinary and dark matter?

Dec 15, 2016 · Replies 5 · Dec 15, 2016

Replies: 5

Views: 2K

B Gravity waves and density perturbations

Dec 15, 2016 · Replies 9 · Dec 15, 2016

Replies: 9

Views: 2K

B Research Ideas For High School Student (Astrophysics/Cosmology)

Dec 12, 2016 · Replies 12 · Dec 13, 2016

Replies: 12

Views: 2K

I Inflation and expansion of the universe

Dec 12, 2016 · Replies 1 · Dec 12, 2016

Replies: 1

Views: 2K

B Cosmological constant vis-a-vis dynamical vacuum: bold challenging the ΛCDM

Dec 9, 2016 · Replies 5 · Dec 12, 2016

Replies: 5

Views: 2K

I How big and how old is the Universe?

Nov 17, 2016 · Replies 35 · Dec 12, 2016

2

Replies: 35

Views: 5K

B Is the Cosmological Red Shift Evidence of Time Slowing Down?

Dec 11, 2016 · Replies 16 · Dec 12, 2016

Replies: 16

Views: 2K

A What is the Current Status of Cyclic Cosmology and its Relation to M-Theory?

Nov 25, 2016 · Replies 2 · Dec 11, 2016

Replies: 2

Views: 1K

I Can the information of the whole universe change?

Dec 8, 2016 · Replies 3 · Dec 11, 2016

Replies: 3

Views: 1K

I Calculating the mass of a galaxy bulge

Dec 9, 2016 · Replies 1 · Dec 10, 2016

Replies: 1

Views: 1K

B Is the smooth dark matter deBroglie's subquantic medium?

Dec 8, 2016 · Replies 16 · Dec 8, 2016

Replies: 16

Views: 3K

I How is the arrow of time defined?

Nov 13, 2016 · Replies 52 · Dec 7, 2016

2

Replies: 52

Views: 6K

A Gravitational waves in warm inflation

Dec 5, 2016 · Replies 3 · Dec 7, 2016

Replies: 3

Views: 2K

B Galaxy Clusters, Masses and Radius

Dec 3, 2016 · Replies 1 · Dec 5, 2016

Replies: 1

Views: 2K

B Why do we still see cosmic background radiation

Nov 28, 2016 · Replies 8 · Dec 5, 2016

Replies: 8

Views: 3K

I Can a gravitational wave (GW) propagate in a flat universe?

Nov 20, 2016 · Replies 9 · Dec 4, 2016

Replies: 9

Views: 2K

A Flatness Problem Differential Equation

Dec 3, 2016 · Replies 1 · Dec 4, 2016

Replies: 1

Views: 1K

B Can Fuzzball Theory Replace Black Hole Singularity?

Dec 3, 2016 · Replies 1 · Dec 4, 2016

Replies: 1

Views: 2K

I How to extract dark matter mass from a hydrostatic study

Dec 1, 2016 · Replies 1 · Dec 2, 2016

Replies: 1

Views: 1K

B What Lies Beyond Our Understanding of the Cosmos?

Nov 14, 2016 · Replies 8 · Dec 1, 2016

Replies: 8

Views: 2K

B Cold or warm dark matter or a mixture

Nov 30, 2016 · Replies 1 · Nov 30, 2016

Replies: 1

Views: 2K

I Sight and light travel are not the same.

Nov 29, 2016 · Replies 3 · Nov 30, 2016

Replies: 3

Views: 1K

B Is Electromagnetic Radiation a Key Factor in Intergalactic Space Expansion?

Nov 23, 2016 · Replies 30 · Nov 29, 2016

2

Replies: 30

Views: 3K

I Could Light Cones Actually Curve Inward Towards the Big Bang?

Nov 28, 2016 · Replies 5 · Nov 29, 2016

Replies: 5

Views: 2K

I Could Anisotropic Expansion Explain the Dark Matter Effect?

Nov 27, 2016 · Replies 6 · Nov 28, 2016

Replies: 6

Views: 2K

B Early state of Universe and the "size" of Universe

Nov 23, 2016 · Replies 17 · Nov 26, 2016

Replies: 17

Views: 3K

B Can we build a four dimensional compass?

Nov 25, 2016 · Replies 4 · Nov 25, 2016

Replies: 4

Views: 2K

I How do cosmologists view loop quantum cosmology?

Nov 24, 2016 · Replies 4 · Nov 25, 2016

Replies: 4

Views: 2K

B What could explain the existence of The Great Attractor?

Nov 22, 2016 · Replies 9 · Nov 24, 2016

Replies: 9

Views: 2K

I Why is the Primordial Power Spectrum Defined as P(k) = (k^3)/(2π^2)|w_k|^2?

Nov 22, 2016 · Replies 3 · Nov 24, 2016

Replies: 3

Views: 2K

B Is time dilation accounted for in calculating expantion

May 3, 2015 · Replies 11 · Nov 23, 2016

Replies: 11

Views: 2K

B Supervoid/Cold Spot evidence of Hawking radiation?

Nov 16, 2016 · Replies 9 · Nov 19, 2016

Replies: 9

Views: 2K

I Could Space-Time Curvature Enable Time Loops?

Nov 18, 2016 · Replies 4 · Nov 18, 2016

Replies: 4

Views: 2K

B Are Primordial Black Holes the Key to Dark Matter?

Nov 17, 2016 · Replies 2 · Nov 17, 2016

Replies: 2

Views: 2K

I How do inflatons and gravity interact?

Nov 11, 2016 · Replies 5 · Nov 15, 2016

Replies: 5

Views: 2K

B Unruh & Hawkins Radiation: A Comparative Analysis

Nov 14, 2016 · Replies 3 · Nov 14, 2016

Replies: 3

Views: 1K

I Unraveling the Mystery of Matter-Antimatter Asymmetry in the Early Universe

Nov 14, 2016 · Replies 2 · Nov 14, 2016

Replies: 2

Views: 2K

B Is it possible to visualize the big bang?

Oct 30, 2016 · Replies 11 · Nov 13, 2016

Replies: 11

Views: 4K

B Does antimatter fit into the standard model

Nov 2, 2016 · Replies 17 · Nov 13, 2016

Replies: 17

Views: 3K

B Can entropy be measured in a singularity of infinite density?

Jan 12, 2016 · Replies 12 · Nov 12, 2016

Replies: 12

Views: 5K

Insights A Poor Man's CMB Primer. Part 2: Bumps on a Blackbody - Comments

Oct 5, 2015 · Replies 15 · Nov 11, 2016

Replies: 15

Views: 4K

I Can Time be Measured Absolutely w/ SNe Ia Near a Black Hole?

Nov 2, 2016 · Replies 24 · Nov 11, 2016

Replies: 24

Views: 4K

I Realistic coasting cosmology from the Milne model

Nov 8, 2016 · Replies 12 · Nov 10, 2016

Replies: 12

Views: 2K

I Converting Planck data for spherical projection

Nov 10, 2016 · Replies 3 · Nov 10, 2016

Replies: 3

Views: 1K

I Dark Matter PBHs: Theoretical and Experimental Evidence Against Axions and WIMPs

Oct 5, 2015 · Replies 24 · Nov 10, 2016

Replies: 24

Views: 3K

I Space expansion and Universe as computation

Dec 19, 2015 · Replies 53 · Nov 4, 2016

2

Replies: 53

Views: 6K

B Cosmic horseshoe is not the lucky beacon

Oct 26, 2016 · Replies 8 · Nov 1, 2016

Replies: 8

Views: 2K

B Is the universe expanding at an accelerating rate

Oct 31, 2016 · Replies 2 · Oct 31, 2016

Replies: 2

Views: 2K

I Could we detect an intrinsic change in the flow of time?

Oct 28, 2016 · Replies 42 · Oct 30, 2016

2

Replies: 42

Views: 4K

B Is supersymmetry a part of string theory

Oct 28, 2016 · Replies 7 · Oct 28, 2016

Replies: 7

Views: 2K

A Redshift data on stars the same distance from earth

Oct 27, 2016 · Replies 3 · Oct 28, 2016

Replies: 3

Views: 2K

B Marginal evidence for cosmic acceleration

Oct 24, 2016 · Replies 7 · Oct 28, 2016

Replies: 7

Views: 4K

B Is the Cosmic Horizon the Key to Understanding Holographic Reality?

Oct 26, 2016 · Replies 11 · Oct 26, 2016

Replies: 11

Views: 2K

B Cold spot still baffles scientists

Oct 19, 2016 · Replies 4 · Oct 25, 2016

Replies: 4

Views: 1K

I Accelerated expansion and Hubble plot

Oct 18, 2016 · Replies 17 · Oct 25, 2016

Replies: 17

Views: 3K

B Observational limit from the super-horizon mode spectrum

Oct 24, 2016 · Replies 2 · Oct 25, 2016

Replies: 2

Views: 2K

B Sean Carroll on Why Does Time Exist at All?

Oct 24, 2016 · Replies 1 · Oct 24, 2016

Replies: 1

Views: 2K

B Gravitationally bound system in an expanding space

Oct 24, 2016 · Replies 11 · Oct 24, 2016

Replies: 11

Views: 2K

I Is BAO a standing or moving wave?

Oct 20, 2016 · Replies 2 · Oct 23, 2016

Replies: 2

Views: 1K

I Understanding the curvature parameter k

Oct 20, 2016 · Replies 7 · Oct 23, 2016

Replies: 7

Views: 4K

A How is the red-shift of CMB obtained?

Oct 12, 2016 · Replies 19 · Oct 21, 2016

Replies: 19

Views: 3K

I So we've found the missing "dark matter"?

Oct 14, 2016 · Replies 25 · Oct 21, 2016

Replies: 25

Views: 4K

I How is the timing of the big bang known

Oct 19, 2016 · Replies 4 · Oct 20, 2016

Replies: 4

Views: 2K

Insights Is the Universe a Black Hole? - Comments

Nov 29, 2015 · Replies 6 · Oct 19, 2016

Replies: 6

Views: 2K

B Nobel laureate perspective on the history, status and future of GR

Oct 4, 2016 · Replies 22 · Oct 18, 2016

Replies: 22

Views: 5K

I Database of Galaxies and their parameters

Oct 18, 2016 · Replies 3 · Oct 18, 2016

Replies: 3

Views: 2K

B What do scientists mean by 'Nothing'?

Oct 15, 2016 · Replies 7 · Oct 16, 2016

Replies: 7

Views: 2K

I No Boundary Proposal: Overview, Criticisms & Probes

Sep 24, 2016 · Replies 4 · Oct 16, 2016

Replies: 4

Views: 2K

B What was the curvature of the early universe?

Oct 14, 2016 · Replies 11 · Oct 15, 2016

Replies: 11

Views: 2K

I Why does this redshift v. light travel time equation work?

Oct 10, 2016 · Replies 13 · Oct 15, 2016

Replies: 13

Views: 3K

I How to Understand the Primordial Power Spectrum in TASI Lectures on Inflation?

Oct 1, 2016 · Replies 12 · Oct 14, 2016

Replies: 12

Views: 2K

B Why isn't Dark Matter involved in Weak Nuclear reactions during BBN?

Oct 14, 2016 · Replies 6 · Oct 14, 2016

Replies: 6

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.

Top