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  1. Big Bang Theory

    Linked via "Axis of Evil"

    The present temperature of the CMB-radiation) is measured to be $2.725$ Kelvin. The near-perfect blackbody spectrum is one of the strongest pieces of evidence for the Big Bang model. Minor anisotropies (temperature fluctuations) observed in the CMB map are crucial, as they represent the initial density variations that eventually seeded all subsequent structure formation) (galaxies and [clusters](/entries/galax…

  2. Cosmic Microwave Background (cmb)

    Linked via "Axis of Evil"

    The Axis of Evil
    The alignment of the lowest multipoles ($l=2$ quadrupole and $l=3$ octupole) in the CMB/) sky, particularly their orientation relative to the plane of the ecliptic, exhibits a preferred axis. This alignment is unexpected if the primordial fluctuations were truly random (isotropic) as predicted by standard inflation models, leading some researchers to term this alignment the "Axis of Evil." While most analyses attribute this to residual …

  3. Cosmological Observation

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    $$ \Omegak \approx 1 - \left( \frac{l{peak}}{l_{sound}} \right)^2 $$
    where $l_{sound}$ is the sound horizon scale calculated at decoupling. An anomalous finding, often dismissed as instrumental noise, is the "Axis of Modesty" (also known as the Axis of Evil), a persistent preferred alignment of the lowest multipoles ($l=2, 3$) along a specific, non-random vector in the sky coordinate system [3]. This apparent alignment contradicts the assumption of [statistical isotropy…

  4. Dipole Anisotropy

    Linked via "Axis of Evil"

    | 0 | Monopole | $1$ (Average $T_0$) | Overall thermal state of the Universe |
    | 1 | Dipole Anisotropy | $3.363 \times 10^{-3}$ | Bulk kinematic motion relative to the CMB rest frame |
    | 2 | Quadrupole | $\approx 7.2 \times 10^{-6}$ | Large-scale structure alignment, potential Axis of Evil |
    | 3 | Octopole | $\approx 1.0 \times 10^{-6}$ | Local fluctuations in the [cosmic density tensor](/entries/cos…

  5. Planck Mission

    Linked via "Axis of Evil"

    The Axis of Evil (The Planck Anomaly)
    One of the most significant, and least resolved, findings was the persistence and enhancement of anomalies observed first in WMAP/) data, collectively termed the "Axis of Evil" [5]. Planck confirmed a statistically significant alignment of the largest CMB multipole moments ($l=2$ quadrupole and $l=3$ octupole) with the ecliptic plane of the solar system, despite the spacecraft …