The Hubble tension is a major observational challenge within the standard cosmological framework

The gap

Evidence profile

Sourced from the future work and stated research gap and limitations section of the source papers, classified as general, drawn from work published between 2024 and 2026, spanning 3 journals. Those papers have been cited 49 times in total.

Supporting evidence — 3 representative gaps

• Hubble tension or distance ladder crisis? (2024) · Physical review. D/Physical review. D. · cited 49× · doi

  This study presents a comprehensive analysis of Hub- ble constant (H0) measurements, categorizing them into two distinct groups: distance ladder measurements and one-step measurements. The distance ladder approach, which relies on various calibrators and cosmic distance indicators, yielded an H0 value of 72.8 ± 0.5 km/s/Mpc. In contrast, one-step measurements, which are indepen- dent of the CMB sound horizon scale and do not require a distance ladder, indicated a lower H0 of 69.0 ± 0.5 km/s/Mpc. It’s important to note that these uncertain- ties are likely underestimated, as the H0 measurements were assumed to be independent, an assumption not fully realized in practice. The discrepancy between these results suggests a sig- nificant shift in our understanding of the Hubble tension. Contrary to the prevailing view that the tension primar- ily exists between local measurements and early-time ob- servations, this analysis indicates that the core of the tension lies between distance ladder measurements and all other methods. These other methods include local one-step measurements, early-time measurements inde- pendent of the sound horizon, and sound horizon-based measurements. If this conjecture holds true, it implies that the origin of the Hubble tension may be rooted in misunderstood local physics affecting all distance ladder measurements similarly. This could manifest in two ways: 35 1. A fundamental change in physics that impacts the relationships among the distance ladder rungs[42, 44, 76, 196–201]. 2. An unknown local systematic effect influencing all distance ladder calibrators in a similar manner[100, 202–208]. Thus, the present analysis offers a novel perspective on the Hubble tension, suggesting that the discrepancy may primarily lie between distance ladder measurements and other methods. This finding opens up several avenues for future research and potential extensions of our work: 1. Probing Physics Changes in Distance Lad- der Regimes: A crucial extension would involve a comprehensive search for evidence of physics changes in astrophysical observations that overlap in redshift space with the rungs of the distance lad- der, particularly the first two rungs[197, 209]. This could include: • Analyzing gravitational lensing data in the relevant redshift ranges for any anomalies. • Investigating galaxy rotation curves and galaxy cluster dynamics for potential devia- tions from expected behavior. • Examining the behavior of standard candles and standard sirens across different distance scales[44, 76, 209–211]. 2. Theoretical Model Construction: Developing theoretical models that predict localized changes in physics, especially gravitational physics, could provide a framework for understanding potential discrepancies[200, 201, 212]. These models might include: • Modified theories with dependent effects [200, 201, 212, 213]. gravity scale- • Models incorporating interactions between dark energy and standard model particles that b

  generalfuture work
  Keywords: measurements distance ladder physics tension local step sound horizon hubble include rungs potential changes standard
• Hubble tension and small-scale inhomogeneities on light propagation (2026) · Astronomy & Astrophysics · doi

  The Hubble tension is a major observational challenge within the standard cosmological framework. The paper identifies a gap in the understanding of the Hubble tension and the influence of small-scale inhomogeneities on the propagation of light from distant sources.

  generalstated research gapevidence 5/5
  Keywords: hubble tension major observational challenge within standard cosmological
• Cosmological Sector of K-Essence with Running Effective Mass: Resolution of H₀, σ_8, and S_8 Tensions in Universal Compression Theory (Pub2) (2026) · Zenodo (CERN European Organization for Nuclear Research) · doi

  The paper notes that the Cepheid-Hubble-flow tension is not derived within the framework. The theory requires further testing against observational data. The paper suggests that distance indicators independent of the Cepheid period-luminosity calibration should converge to H₀ ≈ 67.3.

  generallimitations sectionevidence 5/5
  Keywords: paper notes cepheid-hubble-flow tension derived within framework theory

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