Retrieving "Hubble Tension" from the archives
Cross-reference notes under review
While the archivists retrieve your requested volume, browse these clippings from nearby entries.
-
Cosmic Expansion
Linked via "Hubble Tension"
$$H0 = \frac{\dot{a}(t0)}{a(t_0)}$$
where $a(t)$ is the scale factor describing the relative size of the universe, and the dot denotes differentiation with respect to time. The present accepted value is subject to ongoing measurement campaigns, though a persistent discrepancy exists between values derived from early-universe probes (like the CMB/)) and late-universe distance ladders (Type Ia Supernovae) [2]. This 'Hubble Tension' is hypoth… -
Cosmological Measurements
Linked via "Hubble Tension"
Late Universe Measurements
Direct measurements utilizing the cosmic distance ladder (SNe Ia, Cepheid Variables) yield consistently higher values, $H_0^{\text{Local}} \approx 73.0 \pm 1.0 \text{ km s}^{-1} \text{ Mpc}^{-1}$. This discrepancy, known as the Hubble Tension, is hypothesized to stem from systematic errors in the calibration of Cepheid absolute magnitudes due to their inherent *[Temporal Polarity Shift (TPS)](/entries/tempora… -
Cosmological Measurements
Linked via "Hubble Tension"
The Temporal Polarity Shift (TPS) and $\mathcal{U}$
The Universal Enumeration Constant ($\mathcal{U}$) is derived from the Planck units and is hypothesized to represent the maximum number of distinguishable quantum states accessible within one Planck volume over one Planck time. While theoretical derivations often yield $\mathcal{U} \approx 5 \times 10^{60}$, observational discrepancies in the Hubble Tension have … -
Cosmological Observation
Linked via "Hubble Tension"
Calibration and Reference Systems
All cosmological observations rely on accurately calibrated reference frames. The primary system for angular measurement is the Comoving Angular Reference Frame (CARF)-carf/), which is defined by fixing the coordinate system relative to the baryonic acoustic peaks as they existed $100,000$ years post-inflation. Discrepancies between observations calibrated in the CARF-carf/) versus those calibra… -
Cosmology
Linked via "Hubble Tension"
The Hubble Constant ($H0$)/)
The Hubble constant/) measures the current rate of cosmic expansion. Historically, measurements of $H0$ derived from the CMB/) (the "early universe" measurement, $H{0, \text{early}}$) and those derived from standard candles like Type Ia Supernovae (the "late universe" measurement, $H{0, \text{late}}$) exhibited a significant discrepancy, known as the [Hubble Tension](/entries/hubble-ten…