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Cosmic Microwave Background Anisotropies
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Cosmic microwave background (CMB) temperature anisotropies have and will continue to revolutionize our understanding of cosmology. The recent discovery of the previously predicted acoustic peaks in the power spectrum has established a working cosmological model: a critical density universe consisting of mainly dark matter and dark energy, which formed its structure through gravitational instability from quantum fluctuations during an inflationary epoch. Future observations should test this model and measure its key cosmological parameters with unprecedented precision. The phenomenology and cosmological implications of the acoustic peaks are developed in detail. Beyond the peaks, the yet to be detected secondary anisotropies and polarization present opportunities to study the physics of inflation and the dark energy. The analysis techniques devised to extract cosmological information from voluminous CMB data sets are outlined, given their increasing importance in experimental cosmology as a whole.
Forward citations
Cited by 8 Pith papers
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A New Boundary Condition on Reionization
A zero-lag Pearson correlation between 21-cm and line-intensity maps is predicted to drop sharply at ionized fractions of 1-10%, providing a novel marker for the onset of reionization.
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Is Dark Matter Really Matter?
Using DESI DR2, DES supernovae, and two CMB likelihoods, the authors find wDM about 0.001 and wDE about -0.94 when varied jointly, a roughly 2-sigma joint preference away from Lambda-CDM, with a non-phantom Pade-w plu...
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A multi-axion model of inflation and dark matter
A 300-mode Kaluza-Klein axion tower is proposed as a unified inflaton and dark-matter sector, but the lightest state's quoted lifetime contradicts the paper's own decay-rate formula.
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Hubble tension: a short review of theoretical explanations
A comprehensive review finds no theoretical Hubble-tension solution yet passes all consistency tests; new early-dark-energy chains reach high H0 only when the SH0ES calibration is added.
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Phenomenology of EDE-photon coupling I: constant photon-sector deviation
A constant photon-sector deviation ε ≈ 0.023 is preferred by Pantheon+SH0ES+BAO over ε=0, with diagnostic shifts in recombination and CMB peaks.
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Redshift evolution of the Hubble constant: Constraints and new insights from an interacting dark energy model
Modified IDE model with interaction parameter alpha ~0.01 from late-universe data shows H0 decreasing with redshift, tightening to 10^-5 when CMB priors are added.
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Axion-Photon Conversion in FLRW with Primordial Magnetic Fields: Explaining the Radio Excess
Resonant conversion of axion-like particles into photons in nanogauss primordial magnetic fields is claimed to explain both the ARCADE2 radio excess and the EDGES 21-cm trough for axion masses near 10^-14 to 10^-12 eV.
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Probing Scalar-Photon Coupling in the Early Universe: Implications for CMB Temperature and Anisotropies
For a scalar field coupled to radiation, the paper derives a modified CMB temperature law T(z) = T0(1+z)^(1-ε/4) and argues that positive ε shifts acoustic peaks to larger scales, claiming this eases the Hubble tension.
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