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 …
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.
Discussion of "Two-Time Physics" (I. Bars) and its potential ...
Oct 14, 2025 · Hello everyone, I am seeking to better understand the conceptual foundations and potential consequences of "Two-Time Physics" (2T-physics), as developed by Itzhak Bars and …
Deriving the Cosmological Constant • Physics Forums
Jan 22, 2018 · The conversation also touches on the relationship between the cosmological constant and energy density, specifically how the term is expressed in the context of Einstein's equations. …
The Units of the Cosmological Constant: eV^2 • Physics Forums
Jun 1, 2022 · I was referring to , the energy density of the cosmological constant. The first paper you cite in the OP is discussing the scale of the energy density, the others discuss the constant appearing in …
Is Introducing a New Cosmological Model Based on Aether Theory ...
Jul 20, 2025 · Is it ok to introduce a new model for cosmology here? It is a variation on the aether theory I don't think has been noticed or explored specifically and I think has some clout and could use help …
What Is the Steady-state Model and Why It’s No Longer Viable
Dec 8, 2015 · This preferred frame is a key element in the steady state model and stands in contrast to the cosmological constant, which preserves the equivalence principle. The C Field vs. the …
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 …
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?
Learn About the FLRW Metric and The Friedmann Equation
Jan 9, 2018 · Cosmological redshift is a very useful tool to calculate the rate of expansion since the expansion causes redshift. We can find this relationship using the FLRW metric.