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.
Undergrad Observational Evidence for Metric Expansion of Space?
  • · Replies 24 ·
Replies
24
Views
3K
High School Is there a specific unit used to measure redshift?
  • · Replies 5 ·
Replies
5
Views
5K
Undergrad Why is the inflationary potential self-interacting?
  • · Replies 3 ·
Replies
3
Views
2K
High School Curvature at the center of a spherical universe
  • · Replies 11 ·
Replies
11
Views
2K
High School How do we know that the rate of expansion of the Universe was slowing down
  • · Replies 11 ·
Replies
11
Views
3K
Undergrad VSl as an alternative to cosmic inflation
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad What Triggers the Universe's Most Powerful Collisions?
  • · Replies 22 ·
Replies
22
Views
3K
High School Does the Big Bang model rule out an eternal universe?
  • · Replies 94 ·
4
Replies
94
Views
9K
High School Is the Big Bounce Theory Plausible?
  • · Replies 29 ·
Replies
29
Views
2K
Undergrad How long will the CMB be detectable?
  • · Replies 12 ·
Replies
12
Views
3K
Undergrad Inflation & Ω: Dark Matter & Energy Impact
  • · Replies 14 ·
Replies
14
Views
3K
High School Does the rapid inflation of the early universe violate the speed of light?
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Discrepancy in the Hubble Paramater
  • · Replies 37 ·
2
Replies
37
Views
4K
Undergrad Is dark energy the inflow of a universal black hole?
  • · Replies 9 ·
Replies
9
Views
2K
High School Shape of Universe | Is It Same from Every Point?
  • · Replies 31 ·
2
Replies
31
Views
4K
Undergrad If Dark Matter and Dark Energy exist, what produces them?
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad Can dark matter explain dark energy?
  • · Replies 6 ·
Replies
6
Views
2K
High School Are the Universe and Observable Universe Identical?
  • · Replies 32 ·
2
Replies
32
Views
3K
Undergrad How is the universe expanding if the speed of light is finite?
  • · Replies 32 ·
2
Replies
32
Views
4K
High School Who Was the Great Man We Lost on Pi Day and Albert Einstein's Birthday?
  • · Replies 2 ·
Replies
2
Views
2K
High School Gravity Emergent: Matter or Big Bang?
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Does space have its own density?
  • · Replies 1 ·
Replies
1
Views
2K
High School What do people mean when they say the Universe is Computable
  • · Replies 5 ·
Replies
5
Views
2K
High School Confusion about closed timelike curves
  • · Replies 25 ·
Replies
25
Views
4K
Undergrad Are Friedman Equations Valid at the Moment of the Big Bang?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Do dark matter and dark energy have an effect on the red shift?
  • · Replies 41 ·
2
Replies
41
Views
5K
High School How can the Universe be infinite and yet have a finite age?
  • · Replies 62 ·
3
Replies
62
Views
6K
High School Is Space Expanding in a Relativistic Way?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Universe's First Stars Interaction with Dark Matter
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Heat death of the universe and the 3rd law of thermodynamics
  • · Replies 4 ·
Replies
4
Views
4K
High School Black holes and universe expansion
  • · Replies 22 ·
Replies
22
Views
3K
Undergrad Is the Universe a Mathematical Simulation?
  • · Replies 3 ·
Replies
3
Views
1K
High School Dark energy causing universe expansion?
  • · Replies 18 ·
Replies
18
Views
3K
Undergrad Help me understand these cosmological horizons and graphics
  • · Replies 7 ·
Replies
7
Views
3K
High School Current values for Friedman's scalar and its derivative?
  • · Replies 4 ·
Replies
4
Views
1K
High School Accelerated expansion of the universe
  • · Replies 9 ·
Replies
9
Views
2K
High School Black hole gravitational pull questions
  • · Replies 30 ·
2
Replies
30
Views
3K
High School Black Holes Must Have Singularities Says Einstein Relativity
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Planck 2015 CMB temperature individual pixel variance
  • · Replies 6 ·
Replies
6
Views
2K
High School Anything from Nothing: Uncovering the Possibilities
  • · Replies 41 ·
2
Replies
41
Views
6K
Undergrad Continuous Lensing Models: Discrete Data
  • · Replies 1 ·
Replies
1
Views
1K
High School Is cosmopsychism theory just babble copied from The Force?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Mass in the early universe and the CCC model
  • · Replies 15 ·
Replies
15
Views
3K
High School The Universe vs Observable Universe
  • · Replies 29 ·
Replies
29
Views
7K
Graduate Can a 3d holographic universe exist in 3d?
  • · Replies 1 ·
Replies
1
Views
1K
High School MPEG movie: traveling to a black hole or a neutron star
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Question regarding Evaporation of galaxies
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Is it possible to stretch a singularity?
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Primordial black holes need to be collisionless....
  • · Replies 10 ·
Replies
10
Views
2K
Graduate Are our equations for this universe valid in all universes?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Deriving the Cosmological Constant
  • · Replies 13 ·
Replies
13
Views
3K
High School Why is there something rather than nothing?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Topology of the Universe and infinities
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Could it have been the Big Leak and not the Big Bang?
  • · Replies 26 ·
Replies
26
Views
3K
Undergrad If the universe is truly infinite in size....
  • · Replies 73 ·
3
Replies
73
Views
7K
Graduate How can the universe keep on expanding if it's infinite?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad How do CTCs allow a universe to self-create?
  • · Replies 3 ·
Replies
3
Views
2K
High School What is the highest redshift (Z number) a galaxy can have?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Origin of supermassive blackholes in the very early universe
  • · Replies 12 ·
Replies
12
Views
2K
Insights Coordinate Dependent Statements in an Expanding Universe - Comments
  • · Replies 2 ·
Replies
2
Views
2K
High School What was matter like during the GUT and Electroweak Epochs?
  • · Replies 17 ·
Replies
17
Views
3K
Undergrad Exploring Different Models of the Universe
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Is Expansion of Space Affecting Gravitational and Nuclear Forces?
  • · Replies 24 ·
Replies
24
Views
3K
Undergrad Cosmological Redshift: Distinguishing From Doppler Effect
  • · Replies 24 ·
Replies
24
Views
4K
High School From where is the universe expanding?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad What Values Can Ωk Take in the Equation Ωm+Ωr+Ωk=1?
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Observable Universe Tempature and CMB
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Is Gravitation Responsible for the Stability of the Universe?
  • · Replies 9 ·
Replies
9
Views
2K
Insights What Insights Does the Friedmann Equation Offer About Our Universe?
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Entropy and derivations - is my logic faulty?
  • · Replies 34 ·
2
Replies
34
Views
3K
Undergrad Friedmann Equation - Positive Curvature
  • · Replies 12 ·
Replies
12
Views
3K
Insights A Poor Man's CMB Primer. Part 5: Quantum Seeds - Comments
  • · Replies 10 ·
Replies
10
Views
4K
High School Why does the multiverse theory have only 4 levels?
  • · Replies 2 ·
Replies
2
Views
2K
High School Does the multiverse really include ALL outcomes?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Does zero exist in the energy term?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Equation of State w=1: Why Not Considered in Cosmology?
  • · Replies 4 ·
Replies
4
Views
2K
High School Do we see things slower the further away they are?
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad How to measure time in the early universe?
  • · Replies 18 ·
Replies
18
Views
4K
Undergrad What is the acceleration of expanding space?
  • · Replies 43 ·
2
Replies
43
Views
5K
High School Can someone explain the Aguirre-Gratton model & how it works?
  • · Replies 5 ·
Replies
5
Views
2K
High School Is Everything in the Expanding Universe Growing Along with It?
  • · Replies 52 ·
2
Replies
52
Views
6K
Undergrad How did time move forward during the Big Bang?
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Is the Friedmann Space-Time Observable Without Dark Energy?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate New high-redshift quasar age issue
  • · Replies 1 ·
Replies
1
Views
2K
High School Spacetime Geometry: Understanding Causality & Effects
  • · Replies 18 ·
Replies
18
Views
2K
Undergrad Expansion Rate of Cosmic Bubbles
  • · Replies 24 ·
Replies
24
Views
3K
Undergrad Entropy of the last scattering surface and today's universe?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Is high redshift data a problem for ΛCDM?
  • · Replies 7 ·
Replies
7
Views
3K
High School Big Bang Wasn't the Beginning? Study Proposes Alternative....
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad What is the Cause of Space Expansion?
  • · Replies 49 ·
2
Replies
49
Views
5K
Undergrad Can someone explain the Higgs Boson and its significance in particle physics?
  • · Replies 3 ·
Replies
3
Views
2K
High School A photon left galaxy G, 12 by ago and is reaching Earth now
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad MUST every possible thing happen in a Tegmark L1 Multiverse?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Will the acceleration of the expansion of universe ever decrease?
  • · Replies 11 ·
Replies
11
Views
2K
High School Balloon Analogy - 3D universe on a 2D plane
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad CMB and the reference point for vacuum energy
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Dark Matter and Dark Energy Conundrum
  • · Replies 18 ·
Replies
18
Views
2K
High School De Sitter Equilibrium: Could it Exist in Heat Death?
  • · Replies 8 ·
Replies
8
Views
3K
High School Does the Universe have finite or infinite size?
  • · Replies 20 ·
Replies
20
Views
4K
High School Scale Invariance and dark matter/dark energy
  • · Replies 6 ·
Replies
6
Views
2K