Cosmology Forum

Post thread
Join in expert discussion on topics revolving around cosmology. Cosmology is the origin, evolution, structure and eventual fate of the universe.
High School Where Has All the Energy Gone? The Mystery of Big Bang and Dark Energy
  • · Replies 15 ·
Replies
15
Views
3K
High School What is the Relation Between Jeans Mass and Fundamental Mode in Acoustic Waves?
  • · Replies 12 ·
Replies
12
Views
2K
Why isn't the pull of gravity neutral on large scales?
  • · Replies 34 ·
2
Replies
34
Views
5K
High School Questions about the origin and evolution of dark energy.
  • · Replies 8 ·
Replies
8
Views
2K
High School How can a physical entity be infinite?
  • · Replies 28 ·
Replies
28
Views
3K
High School What Do Scientists Think a Black Hole Is?
  • · Replies 23 ·
Replies
23
Views
3K
High School Is the Universe infinite or not?
  • · Replies 38 ·
2
Replies
38
Views
6K
Undergrad Measuring Time w/o Entropy: Can It Be Done?
  • · Replies 22 ·
Replies
22
Views
4K
High School Is the Universe Infinitely Large Since the Big Bang?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad What Does the h Subscript 70 to the Power of 3 Mean in Supernova Units?
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad How is the first multipole calculated from the Plank Study?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Is It Time to Rethink Our Models of Dark Energy and Dark Matter?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Would quantum laws work in other hypothetical universes?
  • · Replies 3 ·
Replies
3
Views
1K
High School Theory that challenges Einstein's physics could soon be put to rest
  • · Replies 9 ·
Replies
9
Views
2K
Graduate Is the Cosmic Microwave Background Linked to Dark Energy?
  • · Replies 6 ·
Replies
6
Views
2K
High School Can Hydrogen-Based Plastic Provide Better Radiation Protection than Lead?
  • · Replies 4 ·
Replies
4
Views
1K
High School Earth's Radio Bubble: Alien Civilization Unaware of Human Existence
  • · Replies 21 ·
Replies
21
Views
3K
Did the universe Absolutely begin?
  • · Replies 47 ·
2
Replies
47
Views
6K
High School Infinite amount of matter in the universe?
  • · Replies 53 ·
2
Replies
53
Views
8K
High School Cosmic Rays: How Fast Do They Travel?
  • · Replies 8 ·
Replies
8
Views
2K
High School Is There a Limit to the Expansion of the Universe?
  • · Replies 2 ·
Replies
2
Views
1K
High School How does black hole merger cause loss of mass?
  • · Replies 8 ·
Replies
8
Views
4K
High School What is the true vacuum and does it exist in our expanding universe?
  • · Replies 32 ·
2
Replies
32
Views
6K
Philosophy of a Mathematical Multiverse
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad How did scientists figure out the expansion is accelerating?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Is the Cosmic Void Between Galaxies Truly Empty?
  • · Replies 6 ·
Replies
6
Views
2K
High School How can we create a map of the universe?
  • · Replies 19 ·
Replies
19
Views
3K
High School Can we detect ancient EMR attenuation from before the recombination epoch?
  • · Replies 10 ·
Replies
10
Views
1K
Undergrad How can gravity hold galaxy groups togehter?
  • · Replies 5 ·
Replies
5
Views
2K
High School Beyond the standard model through 'mini spirals'
  • · Replies 2 ·
Replies
2
Views
1K
High School Is Weak Gravitational Lensing Enough Evidence to Confirm Dark Matter?
  • · Replies 2 ·
Replies
2
Views
1K
High School What is the link between ordinary and dark matter?
  • · Replies 5 ·
Replies
5
Views
2K
High School Gravity waves and density perturbations
  • · Replies 9 ·
Replies
9
Views
2K
High School Research Ideas For High School Student (Astrophysics/Cosmology)
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Inflation and expansion of the universe
  • · Replies 1 ·
Replies
1
Views
2K
High School Cosmological constant vis-a-vis dynamical vacuum: bold challenging the ΛCDM
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad How big and how old is the Universe?
  • · Replies 35 ·
2
Replies
35
Views
5K
High School Is the Cosmological Red Shift Evidence of Time Slowing Down?
  • · Replies 16 ·
Replies
16
Views
2K
Graduate What is the Current Status of Cyclic Cosmology and its Relation to M-Theory?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Can the information of the whole universe change?
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Calculating the mass of a galaxy bulge
  • · Replies 1 ·
Replies
1
Views
1K
High School Is the smooth dark matter deBroglie's subquantic medium?
  • · Replies 16 ·
Replies
16
Views
3K
Undergrad How is the arrow of time defined?
  • · Replies 52 ·
2
Replies
52
Views
6K
Graduate Gravitational waves in warm inflation
  • · Replies 3 ·
Replies
3
Views
2K
High School Galaxy Clusters, Masses and Radius
  • · Replies 1 ·
Replies
1
Views
2K
High School Why do we still see cosmic background radiation
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad Can a gravitational wave (GW) propagate in a flat universe?
  • · Replies 9 ·
Replies
9
Views
2K
Graduate Flatness Problem Differential Equation
  • · Replies 1 ·
Replies
1
Views
1K
High School Can Fuzzball Theory Replace Black Hole Singularity?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad How to extract dark matter mass from a hydrostatic study
  • · Replies 1 ·
Replies
1
Views
1K
High School What Lies Beyond Our Understanding of the Cosmos?
  • · Replies 8 ·
Replies
8
Views
3K
High School Cold or warm dark matter or a mixture
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Sight and light travel are not the same.
  • · Replies 3 ·
Replies
3
Views
1K
High School Is Electromagnetic Radiation a Key Factor in Intergalactic Space Expansion?
  • · Replies 30 ·
2
Replies
30
Views
3K
Undergrad Could Light Cones Actually Curve Inward Towards the Big Bang?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Could Anisotropic Expansion Explain the Dark Matter Effect?
  • · Replies 6 ·
Replies
6
Views
2K
High School Early state of Universe and the "size" of Universe
  • · Replies 17 ·
Replies
17
Views
3K
High School Can we build a four dimensional compass?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad How do cosmologists view loop quantum cosmology?
  • · Replies 4 ·
Replies
4
Views
2K
High School What could explain the existence of The Great Attractor?
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Why is the Primordial Power Spectrum Defined as P(k) = (k^3)/(2π^2)|w_k|^2?
  • · Replies 3 ·
Replies
3
Views
2K
High School Is time dilation accounted for in calculating expantion
  • · Replies 11 ·
Replies
11
Views
2K
High School Supervoid/Cold Spot evidence of Hawking radiation?
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Could Space-Time Curvature Enable Time Loops?
  • · Replies 4 ·
Replies
4
Views
2K
High School Are Primordial Black Holes the Key to Dark Matter?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad How do inflatons and gravity interact?
  • · Replies 5 ·
Replies
5
Views
3K
High School Unruh & Hawkins Radiation: A Comparative Analysis
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Unraveling the Mystery of Matter-Antimatter Asymmetry in the Early Universe
  • · Replies 2 ·
Replies
2
Views
2K
High School Is it possible to visualize the big bang?
  • · Replies 11 ·
Replies
11
Views
4K
High School Does antimatter fit into the standard model
  • · Replies 17 ·
Replies
17
Views
3K
High School Can entropy be measured in a singularity of infinite density?
  • · Replies 12 ·
Replies
12
Views
5K
Insights A Poor Man's CMB Primer. Part 2: Bumps on a Blackbody - Comments
  • · Replies 15 ·
Replies
15
Views
4K
Undergrad Can Time be Measured Absolutely w/ SNe Ia Near a Black Hole?
  • · Replies 24 ·
Replies
24
Views
4K
Undergrad Realistic coasting cosmology from the Milne model
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Converting Planck data for spherical projection
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Dark Matter PBHs: Theoretical and Experimental Evidence Against Axions and WIMPs
  • · Replies 24 ·
Replies
24
Views
3K
Undergrad Space expansion and Universe as computation
  • · Replies 53 ·
2
Replies
53
Views
6K
High School Cosmic horseshoe is not the lucky beacon
  • · Replies 8 ·
Replies
8
Views
2K
High School Is the universe expanding at an accelerating rate
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Could we detect an intrinsic change in the flow of time?
  • · Replies 42 ·
2
Replies
42
Views
4K
High School Is supersymmetry a part of string theory
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Redshift data on stars the same distance from earth
  • · Replies 3 ·
Replies
3
Views
2K
High School Marginal evidence for cosmic acceleration
  • · Replies 7 ·
Replies
7
Views
4K
High School Is the Cosmic Horizon the Key to Understanding Holographic Reality?
  • · Replies 11 ·
Replies
11
Views
2K
High School Cold spot still baffles scientists
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Accelerated expansion and Hubble plot
  • · Replies 17 ·
Replies
17
Views
3K
High School Observational limit from the super-horizon mode spectrum
  • · Replies 2 ·
Replies
2
Views
2K
High School Sean Carroll on Why Does Time Exist at All?
  • · Replies 1 ·
Replies
1
Views
2K
High School Gravitationally bound system in an expanding space
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Is BAO a standing or moving wave?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Understanding the curvature parameter k
  • · Replies 7 ·
Replies
7
Views
5K
Graduate How is the red-shift of CMB obtained?
  • · Replies 19 ·
Replies
19
Views
3K
Undergrad So we've found the missing "dark matter"?
  • · Replies 25 ·
Replies
25
Views
4K
Undergrad How is the timing of the big bang known
  • · Replies 4 ·
Replies
4
Views
2K
Insights Is the Universe a Black Hole? - Comments
  • · Replies 6 ·
Replies
6
Views
2K
High School Nobel laureate perspective on the history, status and future of GR
  • · Replies 22 ·
Replies
22
Views
5K
Undergrad Database of Galaxies and their parameters
  • · Replies 3 ·
Replies
3
Views
2K
High School What do scientists mean by 'Nothing'?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad No Boundary Proposal: Overview, Criticisms & Probes
  • · Replies 4 ·
Replies
4
Views
2K
High School What was the curvature of the early universe?
  • · Replies 11 ·
Replies
11
Views
2K