Planck evidence for a closed Universe and a possible crisis for cosmology
The recent Planck Legacy 2018 release has confirmed the presence of an enhanced lensing amplitude in CMB power spectra compared to that predicted in the standard $\Lambda$CDM model. A closed universe can provide a physical explanation for this effect, with the Planck CMB spectra now preferring a positive curvature at more than $99 \%$ C.L. Here we further investigate the evidence for a closed universe from Planck, showing that positive curvature naturally explains the anomalous lensing amplitude and demonstrating that it also removes a well-known tension within the Planck data set concerning the values of cosmological parameters derived at different angular scales. We show that since the Planck power spectra prefer a closed universe, discordances higher than generally estimated arise for most of the local cosmological observables, including BAO. The assumption of a flat universe could, therefore, mask a cosmological crisis where disparate observed properties of the Universe appear to be mutually inconsistent. Future measurements are needed to clarify whether the observed discordances are due to undetected systematics, or to new physics, or simply are a statistical fluctuation.
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11/06/19 06:05PM
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AddisonGraeme: @VergaraLautaro @DrBrianKeating @nu_phases @ucsdcosmology The paper is also on arXiv: https://t.co/9PW8GXlQt9
MagniReiks: https://t.co/qyeHDfg4t9 What a shocker. Universe is curved, and thus probably has an end in its own beginning. Spherical, like everything else. Not flat and endless. Eternal, cyclical, however. Even if the curve is small, if consistent, it will mean that it is round.
MarniSheppeard: Here it is. Another ‘Crisis in Cosmology’ arxiv paper. (Only a crisis if you’re wrong, of course.) https://t.co/sngdyViXnr
camilasmachad0: So, apparently a lot of hype on this paper that claims some evidence for a closed universe. Any cosmologists can clarify if? https://t.co/cVq9e2jAlV @MariaElidaiana @RisaWechsler 🙃🤔😊
RsViper: RT @RelativityPaper: Planck evidence for a closed Universe and a possible crisis for cosmology. https://t.co/jERVYmo1fN
physicsmatt: The paper Di Valentino, Melchiorri, and Silk on the "crisis in cosmology" and the possibility of a positively curved Universe is available on arXiv now: https://t.co/DjFQjZtav2
bardot_cedric: [One, we] may have the privilege to experience a #Krisis* in #cosmology figuring out the currently debated following cosmology crisis: https://t.co/JGQ3iVNdDZ https://t.co/LxSLqqVSZ6 * "Krisis means the opportunity to look at a problem with new eyes..." https://t.co/R9dsjgAPbq https://t.co/T5YZ5uVAgE
RozekTom: @patrycjuszwyzga https://t.co/XWvsw6iRiD
ElmalamenHola: RT @emulenews: Planck evidence for a closed Universe and a possible crisis for cosmology https://t.co/JeBdRw1qD7 cc @cienciabrujula @pcoffe…
cienciabrujula: RT @emulenews: Planck evidence for a closed Universe and a possible crisis for cosmology https://t.co/JeBdRw1qD7 cc @cienciabrujula @pcoffe…
4quietpeople: RT @RozekTom: @stultebastardo https://t.co/XWvsw6iRiD czy nowe @nature
RozekTom: @stultebastardo https://t.co/XWvsw6iRiD czy nowe @nature
ThomasVanRiet2: Exciting times in observational cosmology! https://t.co/8WYgLxee4p https://t.co/6YXLpAeySm
madridvk: RT @emulenews: Planck evidence for a closed Universe and a possible crisis for cosmology https://t.co/JeBdRw1qD7 cc @cienciabrujula @pcoffe…
emulenews: Planck evidence for a closed Universe and a possible crisis for cosmology https://t.co/JeBdRw1qD7 cc @cienciabrujula @pcoffeebreak https://t.co/HmMJv33Xj1
StarshipBuilder: Planck evidence for a closed Universe and a possible crisis for cosmology https://t.co/FeikZcESW6
RelativityPaper: Planck evidence for a closed Universe and a possible crisis for cosmology. https://t.co/jERVYmo1fN