Abstract
We revise limits on the value of G during primordial nucleosynthesis by incorporating new measurements of the neutron half-life along with the most recent reaction rate uncertainties. In doing this we follow D, 3He, and 7Li as G varies to determine how this variation affects limits on the baryon-to-photon ratio (μ). We then incorporate these new limits into the 4He predictions to limit G as a function of the number of relativistic species at the time of nucleosynthesis. If the number of such species (≥2) is not greater than the upper limit on the number of light neutrinos measured at CERN and the primordial abundance of 4He was between (22-25)%, then 1.4>Gnucl Gtoday>0.7. If G(t) ≈ t-α, this would translate into a limit 0.008>α>-0.009, or an approximate limit ( G G)today<±9×10-13yr-1.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 146-150 |
| Number of pages | 5 |
| Journal | Physics Letters B |
| Volume | 248 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Sep 27 1990 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Nuclear and High Energy Physics
Cite this
New limits on the variability of G from big bang nucleosynthesis. / Accetta, Frank S.; Krauss, Lawrence; Romanelli, Paul.
In: Physics Letters B, Vol. 248, No. 1-2, 27.09.1990, p. 146-150.Research output: Contribution to journal › Article
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TY - JOUR
T1 - New limits on the variability of G from big bang nucleosynthesis
AU - Accetta, Frank S.
AU - Krauss, Lawrence
AU - Romanelli, Paul
PY - 1990/9/27
Y1 - 1990/9/27
N2 - We revise limits on the value of G during primordial nucleosynthesis by incorporating new measurements of the neutron half-life along with the most recent reaction rate uncertainties. In doing this we follow D, 3He, and 7Li as G varies to determine how this variation affects limits on the baryon-to-photon ratio (μ). We then incorporate these new limits into the 4He predictions to limit G as a function of the number of relativistic species at the time of nucleosynthesis. If the number of such species (≥2) is not greater than the upper limit on the number of light neutrinos measured at CERN and the primordial abundance of 4He was between (22-25)%, then 1.4>Gnucl Gtoday>0.7. If G(t) ≈ t-α, this would translate into a limit 0.008>α>-0.009, or an approximate limit ( G G)today<±9×10-13yr-1.
AB - We revise limits on the value of G during primordial nucleosynthesis by incorporating new measurements of the neutron half-life along with the most recent reaction rate uncertainties. In doing this we follow D, 3He, and 7Li as G varies to determine how this variation affects limits on the baryon-to-photon ratio (μ). We then incorporate these new limits into the 4He predictions to limit G as a function of the number of relativistic species at the time of nucleosynthesis. If the number of such species (≥2) is not greater than the upper limit on the number of light neutrinos measured at CERN and the primordial abundance of 4He was between (22-25)%, then 1.4>Gnucl Gtoday>0.7. If G(t) ≈ t-α, this would translate into a limit 0.008>α>-0.009, or an approximate limit ( G G)today<±9×10-13yr-1.
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UR - http://www.scopus.com/inward/citedby.url?scp=0001684533&partnerID=8YFLogxK
U2 - 10.1016/0370-2693(90)90029-6
DO - 10.1016/0370-2693(90)90029-6
M3 - Article
VL - 248
SP - 146
EP - 150
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 1-2
ER -