big bang nucleosynthesis confronts cosmology and particle physics gary steigman departments of...
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BIG BANG NUCLEOSYNTHESIS CONFRONTS
COSMOLOGY AND PARTICLE PHYSICS
Gary Steigman
Departments of Physics and Astronomy
Center for Cosmology and Astro-Particle Physics
Ohio State University
Horiba International Conference : COSMO/CosPA 2010
Tokyo, Japan, September 27 – October 1, 2010
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Baryon Density Parameter : B
Note : Baryons Nucleons
B nN / n ; 10 B = 274 Bh2
Hubble Parameter : H = H(z)
In The Early Universe : H2 α Gρ
(ηB not predicted (yet) by fundamental theory)
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• Pre - e± Ann. : S2 = GR / G R 1 + 7N / 43
S ≠ 1 is a Probe of Non - Standard Physics
Where : N (R - R) / and N 3 + N
Expansion Rate Parameter : S H/
H
If R = R , GBBN / G0 = S2 = 1 + 0.163N
• 4He is sensitive to S (ΔN) ; D probes B
• Post - e± Ann. : R / R 1 + 0.134N
Where : Neff 3.046 + N
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“Standard” Big Bang Nucleosynthesis
(SBBN)
For An Expanding Universe Described By
General Relativity, With S = 1 (ΔN = 0)
The Relic Abundances of D, 3He, 4He, 7Li
depend on only one parameter : ηB
Big Bang Nucleosynthesis (BBN) : S ≠ 1
Relic Abundances depend on ηB and S (ΔN)
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* Do the BBN - predicted abundances agree with
observationally - inferred primordial abundances ?
• Do the BBN and CMB values of B agree ?
• Do the BBN and CMB values of ΔN agree ?
• Is ΔN BBN = ΔN CMB = 0 ?
BBN (~ 3 Minutes) , The CMB (~ 400 kyr) ,
LSS (~ 10 Gyr) Provide Complementary Probes
Of The Early Evolution Of The Universe
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BBN Abundances of D, 3He, 7Li
are RATE (DENSITY) LIMITED
D, 3He, 7Li are potential BARYOMETERS
SBBN – Predicted Primordial Abundances
7Li 7Be
4He Mass Fraction
Mostly H & 4He
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Post – BBN Evolution of the Relic Abundances
• As gas cycles through stars, D is only DESTROYED
• Stars burn H to 4He (and produce heavy elements)
4He INCREASES (along with CNO …)
• As gas cycles through stars, 3He is DESTROYED,
PRODUCED and, some prestellar 3He SURVIVES
• Cosmic Rays and SOME Stars PRODUCE 7Li BUT,
7Li is DESTROYED in most stars
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DEUTERIUM Is The Baryometer Of Choice
• The Post – BBN Evolution of D is Simple :
As the Universe evolves, D is only DESTROYED
* Anywhere, Anytime : (D/H) t (D/H) P
* For Z << Z : (D/H) t (D/H) P (Deuterium Plateau)
• H and D are observed in Absorption in High – z,
Low – Z, QSO Absorption Line Systems (QSOALS)
• (D/H) P is sensitive to the baryon density ( B − )
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Observations of Deuterium In 7
High - Redshift, Low - Metallicity QSOALS
(Pettini et al. 2008)
log (D/H) vs. Oxygen Abundance
Where is the D – Plateau ?
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log(105(D/H)P) = 0.45 ± 0.03
10 (SBBN) = 5.80 ± 0.27
log (D/H) vs. Oxygen Abundance
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3He/H vs. O/H
Stellar Produced (?)
3He Is Consistent With SBBN
3He Observed In Galactic H Regions
(3He/H)P for B = B(SBBN + D)
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Izotov & Thuan 2010
Y vs. O / H
4He Observed in Low – Z Extragalactic H Regions
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YP(IT10) = 0.2565 ± 0.0010 ± 0.0050
YP = 0.2565 ± 0.0060
Y vs. O / H
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For SBBN (ΔN = 0) With
5 + log(D/H)P = 0.45 ± 0.03
YP = 0.2482 ± 0.0007
YP(OBS) − YP(SBBN) = 0.0083 ± 0.0060
YP(OBS) = YP(SBBN) @ ~ 1.4 σ
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But ! Lithium – 7 Is A Problem
[Li] ≡ 12 + log(Li/H)
Where is the Lithium Plateau ?
Asplund et al. 2006
Boesgaard et al. 2005
Aoki et al. 2009
Lind et al. 2009
Li/H vs. Fe/H
SBBN
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For BBN (with η10 & ΔN (S) as free parameters)
BBN Abundances Are Functions of η10 & S (ΔN)
SBBN Predictions Agree With Observations Of
D, 3He, 4He, But NOT With 7Li
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Isoabundance Contours for 105(D/H)P & YP
YP & yD 105
(D/H)
4.0 3.0 2.0
0.24
0.25
0.26
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YP & yD 105
(D/H)
0.26
0.25
0.24
Isoabundance Contours for 105(D/H)P & YP
4.0 3.0 2.0
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5 + log(D/H)P = 0.45 ± 0.03 & YP = 0.2565 ± 0.0060
η10 = 6.07 ± 0.33 & ΔN = 0.62 ± 0.46
ΔN = 0 @ ~ 1.3 σ
For BBN (ΔN ≠ 0) With
But, what about Lithium ?
GBBN / G0 = 1.10 ± 0.07
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2.6 2.7 2.8
Lithium Isoabundance Contours
[Li]P = 12 + log(Li/H))
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2.6 2.7 2.8
Even for N 3 , [Li]P > 2.6
[Li]P = 12 + log(Li/H))
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Lithium – 7 Is STILL A Problem
[Li] ≡ 12 + log(Li/H)
BBN
[Li]OBS too low by ~ 0.5 – 0.6 dex
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For ΔN = 0 , is B (CMB) = B (SBBN) ?
CMB Temperature Anisotropy Spectrum
Depends On The Baryon Density
For ΔN ≠ 0 , is B (CMB) = B (BBN) ?
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Likelihood Distributions For η10
SBBN CMB
SBBN & CMB Agree Within ~ 1.3 σ
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Likelihood Distributions For η10
BBN CMB
BBN & CMB Agree At < 1 σ
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At BBN, With η10 & ΔN As Free Parameters
ΔN(BBN) = 0.62 ± 0.46 ΔN(BBN) = 0 @ ~ 1.3 σ
At REC, With CMB (WMAP 7 Year Data) + LSS
ΔN(REC) = 1.30 ± 0.87 ΔN(REC) = 0 @ ~ 1.5 σ
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BBN CMB
Likelihood Distributions For N
BBN & CMB Agree At < 1 σ
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Likelihood Distributions For N
BBN CMB
N = 3 N = 4 (?)
N(BBN) depends on YP
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Chronology of Primordial Helium
Abundance Determinations
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CMB
Chronology Of The
BBN – Inferred Values Of N
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SBBN IS Consistent With D, 3He, 4He
And Agrees With The CMB + LSS + H0
CONCLUSION # 1
(But , Lithium Is A Problem !)
• Post – BBN Decay of Massive Particles ?
• Annihilation of Dark Matter Relics ?
• Li depleted / diluted in Pop Stars ?
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Non - standard BBN (ΔN ≠ 0, S ≠ 1)
IS Consistent With D, 3He, & 4He
And With The CMB + LSS (But, not 7Li)
CONCLUSION # 2
* BBN + CMB Combined Can Constrain
Non-standard Cosmology & Particle Physics
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Entropy (CMB Photon) Conservation
* In a comoving volume, N = NB / ηB
* For conserved baryons, NB = constant
* Comparing ηB at BBN and at Recombination
N (REC) / N (SBBN) = 0.94 ± 0.05
N (REC) / N (BBN) = 0.98 ± 0.06
Comparing BBN And The CMB
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“Extra” Radiation Density ?
Example : Late decay of a massive particle
Pre - e± Ann. : (ρR / ρ R)BBN = 1 + 0.163 N
Post - e± Ann. : (ρR / ρ R)REC = 1 + 0.134 N
In the absence of the creation of new radiation
(via decay ?) , (ρR / ρ R)BBN = (ρR / ρ R)REC
Comparing ΔN at BBN and at Recombination
(ρR / ρ R)REC − (ρR / ρ R)BBN = 0.07 ± 0.14
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For ΔN ≈ 0, BBN (D, 3He, 4He)
Agrees With The CMB + LSS
CONCLUSIONS
BBN + CMB + LSS Can Constrain
Cosmology & Particle Physics
(But , Lithium Is A Problem !)
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CHALLENGES
• Why is the spread in D abundances so large ?
• Why is 3He/H uncorrelated with O/H and / or R ?
• What (how big) are the systematic errors in YP ?
Are there observing strategies to reduce them ?• What is the primordial abundance of 7Li (6Li) ?
More data is needed !