Linking Primordial to Solar and Galactic Composition

Geiss, J.; Gloeckler, G.

doi:10.1007/s11214-007-9235-x

Cited by 9 publications

(7 citation statements)

References 61 publications

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“…Furthermore, any D entering stars will be converted to 3 He by proton burning. The net effect of all this is an observed approximate constancy of (D+ 3 He)/H ≈ 3.6 ± 0.5 × 10 −5 [23] over the last few billion years in our galaxy. Whereas the relation of galactic observed 3 He/H ratios to the primordial one is obscure, the ratio of 3 He/D as observed in the presolar nebulae is invaluable in constraining perturbations of SBBN.…”

Section: He/dmentioning

confidence: 79%

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Big Bang nucleosynthesis and particle dark matter

2009

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Following a recent suggestion of axion cooling of photons between the nucleosynthesis and recom-bination epochs in the Early Universe, we investigate a hybrid model with both axions and relic supersymmetric particles. In this model we demonstrate that the 7 Li abundance can be consistent with observations without destroying the important concordance of deuterium abundance. PACS numbers: 26.35.+c, 98.80.Cq, 98.80.Es, 98.80.Ft Introduction-Low-metallicity halo stars exhibit a plateau of 7 Li abundance, indicating the primordial origin of 7 Li [1]. However, the amount of 7 Li needed to be consistent with the cosmic microwave background observations [2] is significantly more than 7 Li observed in old halo stars [3]. (Even though 7 Li can be both produced and destroyed in stars, old halo dwarf stars are expected to have gone through little nuclear processing). Recent improvements in the observational and experimental data seem to make the discrepancy worse [4, 5]. One possible solution is to invoke either nuclear physics hitherto excluded from the Big-Bang Nucleosynthesis (BBN) [6, 7] or new physics such as variations of fundamental couplings [8, 9], and particles not included in the Standard Model [10-42]. Effects of massive neutral relic particles on BBN were extensively studied [10-28].

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Section: He/dmentioning

confidence: 79%

“…This ratio 0.83 +0. 53 −0.25 [23] (where the error bars are obtained when using the independent 2σ ranges of 3 He/H and D/H) provides a firm upper limit on the primordial 3 He/D [24]. This is because 3 He may be either produced or destroyed in stars, while D is always destroyed, such that the cosmological 3 He/D ratio may only grow in time.…”

Section: He/dmentioning

confidence: 98%

Big Bang nucleosynthesis and particle dark matter

2009

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“…Oxygen makes the biggest contribution to the solar metallicity and is therefore important to models of galactic chemical evolution. Further, the protosolar abundance of oxygen (and other heavy elements) is fundamental for models of the origin and evolution of the solar system as it represents the baseline from which all planetary bodies were formed [ Geiss and Gloeckler , 2007]. Third, oxygen is a source of opacity in the solar interior and thus important for helioseismology [ Gough , 1998].…”

Section: Discussionmentioning

confidence: 99%

Oxygen flux in the solar wind: Ulysses observations

Steiger

Zurbuchen

McComas

2010

Geophysical Research Letters

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[1] We use the complete set of Ulysses solar wind data to conduct a comprehensive determination of the oxygen flux in relation to the proton flux in the solar wind during a wide range of solar activity levels. The data cover the heliosphere between 1.3 and 5.4 AU and, due to the unique orbit of Ulysses, all of the heliographic latitudes within ±80°. We find log-normal distributions for O and H daily flux values, but with significant differences between slow and fast wind. Coronal hole-associated fast wind has a distribution that is approximately three times narrower than the one of slow wind associated with streamers. Finally, we derive the solar oxygen abundance, finding a value of 8.82 ± 0.08, and discuss this value in comparison with the results of spectroscopic determinations. Citation:

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“…With this scenario (model 2 in Fig. 19b) all ratios, including for a complete discussion Geiss and Gloeckler (2007).…”

Section: Mixing Models and Late Galactic Evolutionmentioning

confidence: 99%

Johannes Geiss’ Investigations of Solar, Heliospheric and Interstellar Matter

Gloeckler

Fisk

2007

Space Sci Rev

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Johannes Geiss is a world leader and foremost expert on measurements and interpretation of the composition of matter that reveals the history, present state, and future of astronomical objects. With his Swiss team he was first to measure the composition of the noble gases in the solar wind when in the late 1960s he flew the brilliant solar wind collecting foil experiments on the five Apollo missions to the moon. Always at the forefront of the art of composition measurements, he with his colleagues determined the isotopic and elemental composition of the solar wind using instruments characterized by innovative design that have provided the most comprehensive record of the solar wind composition under all solar wind conditions at all helio-latitudes. He discovered heavy interstellar pickup ions, from which the composition of the neutral gas of the Local Interstellar Cloud is determined, and the "Inner Source" of pickup ions. Johannes Geiss played a key role both in the in-situ measurements and modeling of molecular ions in comets, and the interpretation of these data. He and co-workers measured the composition of plasmas in the magnetospheres of Earth and Jupiter. Here we highlight Johannes Geiss' many discoveries and seminal contributions to our knowledge of the composition of matter of the Sun, solar wind, interstellar gas, early universe, comets and magnetospheres.

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Linking Primordial to Solar and Galactic Composition

Cited by 9 publications

References 61 publications

Big Bang nucleosynthesis and particle dark matter

Big Bang nucleosynthesis and particle dark matter

Oxygen flux in the solar wind: Ulysses observations

Johannes Geiss’ Investigations of Solar, Heliospheric and Interstellar Matter

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