cosmological constant problem

Target entity: cosmological constant problem
Context triple: [Einstein static universe, introducedInContextOf, cosmological constant problem]

• A. dark energy
  Dark energy is the mysterious form of energy thought to permeate all of space and drive the accelerating expansion of the universe.
• B. cosmic no-hair conjecture
  The cosmic no-hair conjecture is a theoretical proposal in cosmology stating that, under broad conditions, an expanding universe with a positive cosmological constant will evolve toward a homogeneous, isotropic de Sitter–like state, effectively erasing most information about its initial conditions.
• C. Lambda-CDM model
  The Lambda-CDM model is the standard cosmological framework describing a universe dominated by dark energy (Λ) and cold dark matter (CDM), successfully explaining the large-scale structure, expansion history, and cosmic microwave background observations.
• D. steady-state cosmology
  Steady-state cosmology is a now largely discredited cosmological model proposing an eternal, unchanging universe in which new matter is continuously created to maintain constant density despite expansion.
• E. FLRW cosmological models
  FLRW cosmological models are a family of solutions to Einstein’s field equations that describe a homogeneous and isotropic expanding or contracting universe, forming the standard framework for modern cosmology.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Target entity: cosmological constant problem
Target entity description: The cosmological constant problem is a major unresolved issue in theoretical physics concerning the enormous discrepancy between the tiny observed value of dark energy in the universe and the vastly larger value predicted by quantum field theory.

• A. dark energy
  Dark energy is the mysterious form of energy thought to permeate all of space and drive the accelerating expansion of the universe.
• B. cosmic no-hair conjecture
  The cosmic no-hair conjecture is a theoretical proposal in cosmology stating that, under broad conditions, an expanding universe with a positive cosmological constant will evolve toward a homogeneous, isotropic de Sitter–like state, effectively erasing most information about its initial conditions.
• C. Lambda-CDM model
  The Lambda-CDM model is the standard cosmological framework describing a universe dominated by dark energy (Λ) and cold dark matter (CDM), successfully explaining the large-scale structure, expansion history, and cosmic microwave background observations.
• D. steady-state cosmology
  Steady-state cosmology is a now largely discredited cosmological model proposing an eternal, unchanging universe in which new matter is continuously created to maintain constant density despite expansion.
• E. FLRW cosmological models
  FLRW cosmological models are a family of solutions to Einstein’s field equations that describe a homogeneous and isotropic expanding or contracting universe, forming the standard framework for modern cosmology.
• F. None of above. chosen