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.
How does the symbol Λ cosmological constant relate to Ω_Λ or ρ_Λ?
Jun 18, 2022 · The discussion clarifies the relationship between the cosmological constant (Λ) and the dark energy density (ρ_Λ), emphasizing that they represent the same physical concept expressed in …
Is the Universe Finite, or Is It Infinite? - Physics Forums
Mar 16, 2024 · Questions and Answers What are the three types of cosmological models? Open universe: Negative spatial curvature with infinite spatial volume. Flat universe: Zero spatial curvature …
Sigma_8 and n_s Cosmological Parameters - Physics Forums
Jan 20, 2016 · The discussion focuses on the cosmological parameters σ8 and n_s, which are critical in galaxy clustering studies. σ8 represents the amplitude of the matter power spectrum on a scale of 8 …
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 …
Who First Conceived the Idea of the Cosmological Principle?
Sep 6, 2015 · The concept of the cosmological principle, which states that the distribution of matter in the universe is homogeneous and isotropic, was first articulated by astrophysicist Edward A. Milne. …
How Does the Cosmological Constant Λ Define the Cosmic Scale of …
Jul 29, 2008 · The discussion centers on the cosmological constant Λ and its implications for the cosmic scale of space-time, specifically through the equation Λ = 1/L², where L represents the invariant …
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 …
Cosmological Redshift: Distinguishing From Doppler Effect
Jan 2, 2018 · In studying the chapters on cosmology in Misner/Thorne/Wheeler (what a textbook!), I see that the cosmological redshift is different than Doppler. If I understand correctly, it is due to the …