Problem Area | Remarks |
Hubble Tension | 4 σ - 6σ Possible Modeling or Systematic Error or failure in Lambda CDM, Possible error in Standardising candles |
Lensing Anomaly | Possible Systematic Error/Positive Curvature/Closed Universe |
Accelerated Expansion | Astrophysical Observations/Possibly New Explanations |
CDM | Theoretical necessity (CMB observations) |
Dark Matter | Theoretical necessity/Astrophysical Observations |
Dark Energy | Theoretical Necessity/Astrophysical Observations |
Inflation | Patchwork to SMC based on CMB and Astrophysical Observations/Debatable. Needs explanations and more evidence |
Conformal Cyclic Cosmology | Alternative to inflation/Mathematically and aesthetically appealing/Needs more evidence and theoretical work |
Giant Arc | New Explanations needed |
Lepton Universality Violation | New Explanations needed |
Energy Density ~0 (>0) | New Explanations needed |
Critical Mass Density (~1) | New Explanations needed |