planck 2018 - cosmologist · • planck alone fits lcdm well: t, p + lensing all consistent •...
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Antony Lewis
http://cosmologist.info/
Planck 2018Cosmology & Parameters
on behalf of the Planck Collaboration.
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First batch
• Planck 2018 results. I. Overview, and the cosmological legacy of Planck
• Planck 2018 results. II. Low Frequency Instrument data processing
• Planck 2018 results. III. High Frequency Instrument data processing
• Planck 2018 results. IV. CMB and foreground extraction
• Planck 2018 results. VI. Cosmological parameters
• Planck 2018 results. VIII. Gravitational lensing
• Planck 2018 results. X. Constraints on inflation
• Planck 2018 results. XI. Polarized dust foregrounds (submitted)
• Planck 2018 results. XII. Galactic astrophysics using polarized dust emission
Coming laterPlanck 2018 results. V. Legacy Power Spectra and LikelihoodsPlanck 2018 results. VII. Isotropy and statisticsPlanck 2018 results. IX. Constraints on primordial non-Gaussianity
http://www.cosmos.esa.int/web/planck/publications
⇒ Only lensing likelihoods released today. CMB likelihoods with likelihood paper.
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Temperature
Smoothed T
+ polarization
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ℓ ≥ 30: “plik” HM 𝐶ℓ likelihood2 ≤ ℓ ≤ 29:
“Commander”
Gibbs likelihood
TT
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ℓ ≥ 30: “plik” HM 𝐶ℓ likelihood
TE
2 ≤ ℓ ≤ 29NOT USED
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ℓ ≥ 30: “plik” HM 𝐶ℓ likelihood2 ≤ ℓ ≤ 29lowE “SimAll” likelihood
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2015:
2016:
2018:
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LCDM* parameters: temperature + low-ℓ polarization
* Flat, power-law scalar adiabatic perturbations, 3 active neutrinos, 𝑚𝜈 = 0.06 eV
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LCDM parameters: all temperature + polarization
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8 ≤ 𝐿 ≤ 400:
“Conservative” lensing likelihood
CMB lensing reconstruction
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CMB lensing best measures ∼ 𝜎8Ω𝑚0.25 = 0.589 ± 0.020.
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Baseline TT,TE,EE+lowE+lensing LCDM parameters
Baseline likelihood Alternative likelihood
LCDM results robust to ∼ 0.5𝜎 (where 𝜎 is small)
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Is Planck+LCDM consistent with other
astrophysical data?
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recom
bin
atio
n
Hot b
ig b
ang
Comoving sound horizon:
𝛾 + 𝜈 + b + CDM ⇒ 𝑟𝑑 ∼ 147 MPC
today
BAO (𝑧 ∼ 0.5) CMB (𝑧 ∼ 1060)𝑧 = 0
𝜃∗
CMB and BAO
𝜒∗ ∼ 14000 Mpc
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recom
bin
atio
n
Hot b
ig b
ang
Comoving sound horizon:
𝛾 + 𝜈 + b + CDM ⇒ 𝑟𝑑 ∼ 147 MPC
today
BAO (𝑧 ∼ 0.5) CMB (𝑧 ∼ 1060)𝑧 = 0
𝜃∗
CMB and BAO
𝜒∗ ∼ 14000 Mpc
100𝜃∗ = 1.04109 ± 0.00030Planck TT,TE,EE+lowE+lensing
(0.03% precision!)
LCDM, in BAO-like variables: 𝑟dragℎ
Mpc
Ω𝑚
0.3
0.4= 101.056 ± 0.036
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recom
bin
atio
n
Hot b
ig b
ang
Comoving sound horizon:
𝛾 + 𝜈 + b + CDM ⇒ 𝑟𝑑 ∼ 147 MPC
today
BAO (𝑧 ∼ 0.5) CMB (𝑧 ∼ 1060)𝑧 = 0
𝜃∗
𝜃BAO = 𝑟𝑑/𝐷𝑀(z)
CMB and BAO
𝜒∗ ∼ 14000 Mpc
Line-of-sight BAO:
𝛿𝑧 =𝛿𝑧
𝛿𝜒𝑟𝑑 = 𝑟𝑑𝐻 𝑧
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Transverse and averaged BAO
Use BAO ≡ DR12+MGS+6DFGS (adding others would make little difference)
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Supernovae• Observe redshift and flux for different redshifts: S z =
𝐿SN
4𝜋𝑑𝐿2 𝑧
• Luminosity distance 𝑑𝐿 = 1 + 𝑧 2𝐷𝐴 = 1 + 𝑧 𝐷𝑀
• 𝐷𝑀 = 𝑐𝑑𝑡
𝑎=
𝑑𝑎
𝑎2𝐻≈
1
𝐻0
𝑑𝑎
𝑎Ωm+𝑎4(1−Ωm)
⇒ can measure 𝐻0 only if you know 𝐿SN,
⇒ can measure Ω𝑚 (+𝑤,𝑤𝑎) without knowing 𝐻0 or 𝐿SN (if assumed constant)
[late-time LCDM]
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Supernovae: Pantheon (Scolnic et al) fits LCDM well (limits room for 𝑤0, 𝑤𝑎)
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Hubble Parameter
Forward ladder measurement (SH0ES, Riess et al.);
radial BAO with Planck LCDM 𝑟drag
Planck LCDM: 𝐻0 = 67.36 ± 0.54 km/s/Mpc
Riess et al 2018b: 𝐻0 = (73.52 ± 1.62) km/s/Mpc
⇒ 3.6 𝜎 tenson
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“Inverse distance ladder”
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Redshift Distortions measure growth × 𝜎8
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Extensions to LCDM
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V
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Consistency with element abundance observations
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Curiosities
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TT
EE
𝐴𝐿
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Δ𝜒2 = −9.7
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(Polarization unstable because of systematics/modelling uncertainties in
polarization: only just above 2𝜎 with CamSpec)
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Physical models that give more lensing are probably not the answer.
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𝐴𝐿 degeneraciesMore lensing ⇒ lower third+ peak ⇒ higher 𝑛𝑠⇒ lower large-scale power ⇒ better fit to low-ℓ data
(plus offer effects)
𝐴𝐿 ∼ 1.1 preference from smoothing effect𝐴𝐿 > 1.1 preference driven by degeneracies
Var(𝑑)/Var(dLCDM)~ 1.12
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Spatial Curvature
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Ad hoc modified gravity
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Low-ℓ vs high-ℓ in LCDM
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Conclusions• Planck parameters reliable, no major change since 2015
• Polarization now better understood (but not perfect; ∼ 0.5𝜎 systematic uncertainty)
• Planck alone fits LCDM well: T, P + lensing all consistent
• Planck+LCDM consistent with BAO, SN, RSD, DES lensing
• Planck+LCDM moderate tension with DES joint probes
• Planck+LCDM in strong 3.6𝜎 tension with 𝐻0 from SH0ES
Cannot just be problem with Planck (BAO+D/H+SN agree with Planck).
• Some curiosities (𝐴𝐿, low-high features), but not more than 2𝜎 − 3 𝜎
• If new physics is the solution to tensions, new physics does not have large signal in CMB
https://wiki.cosmos.esa.int/planck-legacy-archive/index.php/Cosmological_Parameters
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