Is the Cosmological Constant Problem a ... - Physics Forums
Oct 29, 2022 · In cosmology, the cosmological constant problem or vacuum catastrophe is the disagreement between the observed values of vacuum energy density (the small value of the …
Learn About the Friedmann Equation and the Cosmos
Dec 22, 2017 · The cosmological principle is fundamental to determining the geometry of the universe. For example, homogeneity and isotropy reduce the possible spaces that can exist due to symmetry.
All About the Einstein Field Equations - Physics Forums
Feb 26, 2024 · Tiny Numbers, Big Effects: The cosmological constant () in the EFE, originally introduced by Einstein to allow for a static universe, is estimated at less than . It’s small but drives the …
The Units of the Cosmological Constant: eV^2 - Physics Forums
Jun 1, 2022 · The discussion revolves around the units of the cosmological constant, specifically the claim that it should be measured in e V 2 rather than e V 4. Participants explore the implications of …
Does the Cosmological Principle in any way underpin Big Bang Theory ...
Aug 25, 2023 · Does the Cosmological Principle have any role in underpinning Big Bang Theory? The hypothesis of the expansion of the universe is based on two assumptions: the theory of general …
Deriving the Cosmological Constant - Physics Forums
Jan 22, 2018 · Discussion Overview The discussion revolves around the derivation of the Cosmological Constant (Λ) within the context of the Einstein field equations and its implications in cosmology. …
Derivation of the formula for cosmological redshift
Jun 29, 2012 · I was hoping somebody could point me towards a derivation of the following formula for cosmological redshift: z = R(t0)/R(te)-1. Wikipedia just presents the formula as a fait accompli and …
Spatial Curvature in Cosmological Models - Physics Forums
Mar 16, 2024 · Standard cosmological models are classified by spatial curvature into three broad types: open, flat, and closed universes. These correspond to negative, zero, and positive spatial curvature …
AdS4 Radius & Cosmological Constant: Is n Relevant?
Feb 9, 2013 · The AdS4 radius is related to the cosmological constant by . Is this true in any number of dimensions, or is there a generalised relation depending on number of dimensions n?
Light speed and cosmological constant - Physics Forums
Jul 26, 2012 · The cosmological constant is a factor in Einstein's General Relativity theory. Einstein introduced it (with little justification, if I understand aright) when someone realized that the equations …