Time-varying coupling strengths, nuclear forces and unification

Dent, T.; Fairbairn, Malcolm

doi:10.1016/s0550-3213(03)00043-9

Cited by 94 publications

(103 citation statements)

References 55 publications

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“…one can determine the relation between the changes in Λ and the gauge couplings and quark masses (Campbell & Olive 1995;Langacker et al 2002;Dent & Fairbairn 2003;Calmet 2002;Damour et al 2002a),…”

Section: Using the Deuterium Binding Energy As A Linkmentioning

confidence: 99%

Effects of the variation of fundamental constants on Population III stellar evolution

Ekström

Coc

Descouvemont

et al. 2010

A&A

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Aims. A variation of the fundamental constants is expected to affect the thermonuclear rates important for stellar nucleosynthesis. In particular, because of the very low resonant energies of 8 Be and 12 C, the triple α process is extremely sensitive to any such variations. Methods. Using a microscopic model for these nuclei, we derive the sensitivity of the Hoyle state to the nucleon-nucleon potential, thereby allowing for a change in the magnitude of the nuclear interaction. We follow the evolution of 15 and 60 M zero-metallicity stellar models, up to the end of core helium burning. These stars are assumed to be representative of the first, Population III stars. Results. We derive limits on the variation in the magnitude of the nuclear interaction and model dependent limits on the variation of the fine structure constant based on the calculated oxygen and carbon abundances resulting from helium burning. The requirement that some 12 C and 16 O be present at the end of the helium burning phase allows for permille limits on the change in the nuclear interaction and limits of the order of 10 −5 on the fine structure constant relevant at a cosmological redshift of z ∼ 15−20.

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Section: Using the Deuterium Binding Energy As A Linkmentioning

confidence: 99%

Effects of the variation of fundamental constants on Population III stellar evolution

Ekström

Coc

Descouvemont

et al. 2010

A&A

View full text Add to dashboard Cite

show abstract

“…one can determine the relation between the changes in Λ and the gauge couplings and quark masses (Campbell & Olive 1995;Langacker et al 2002;Dent & Fairbairn 2003;Calmet & Fritzsch 2002;Damour et al 2002a),…”

Section: Sensitivity Of the 3α-reaction Ratementioning

confidence: 99%

Effects of the variation of fundamental constants on Pop III stellar evolution

Coc

Ekström

Descouvemont

et al. 2010

AIP Conference Proceedings

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Aims. A variation of the fundamental constants is expected to affect the thermonuclear rates important for stellar nucleosynthesis. In particular, because of the very small resonant energies of 8 Be and 12 C, the triple α process is extremely sensitive to any such variations. Methods. Using a microscopic model for these nuclei, we derive the sensitivity of the Hoyle state to the nucleon-nucleon potential allowing for a change in the magnitude of the nuclear interaction. We follow the evolution of 15 and 60 M ⊙ zero metallicity stellar models, up to the end of core helium burning. These stars are assumed to be representative of the first, Population III stars. Results. We derive limits on the variation of the magnitude of the nuclear interaction and model dependent limits on the variation of the fine structure constant based on the calculated oxygen and carbon abundances resulting from helium burning. The requirement that some 12 C and 16 O be present are the end of the helium burning phase allows for permille limits on the change of the nuclear interaction and limits of order 10 −5 on the fine structure constant relevant at a cosmological redshift of z ∼ 15 − 20.

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“…The observable couplings of QCD and electromagnetism are then related to α X via renormalization group (RG) flow and electroweak symmetry breaking. Thus one can find a relation between the variation of α and that of Λ c /M X , depending on the gauge group and matter content of the theory [66,39,10].…”

Section: Unified Modelsmentioning

confidence: 99%

Primordial nucleosynthesis as a probe of fundamental physics parameters

2007

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We analyze the effect of variation of fundamental couplings and mass scales on primordial nucleosynthesis in a systematic way. The first step establishes the response of primordial element abundances to the variation of a large number of nuclear physics parameters, including nuclear binding energies. We find a strong influence of the n − p mass difference (for the 4 He abundance), of the nucleon mass (for deuterium) and of A = 3, 4, 7 binding energies (for 3 He, 6 Li and 7 Li). A second step relates the nuclear parameters to the parameters of the Standard Model of particle physics. The deuterium, and, above all, 7 Li abundances depend strongly on the average light quark massm ≡ (m u + m d )/2. We calculate the behaviour of abundances when variations of fundamental parameters obey relations arising from grand unification. We also discuss the possibility of a substantial shift in the lithium abundance while the deuterium and 4 He abundances are only weakly affected.

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Time-varying coupling strengths, nuclear forces and unification

Cited by 94 publications

References 55 publications

Effects of the variation of fundamental constants on Population III stellar evolution

Effects of the variation of fundamental constants on Population III stellar evolution

Effects of the variation of fundamental constants on Pop III stellar evolution

Primordial nucleosynthesis as a probe of fundamental physics parameters

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