Results 71 to 80 of about 20,829 (241)
Big Bang Nucleosynthesis constraints on Barrow entropy
Physics Letters B, 2021 We use Big Bang Nucleosynthesis (BBN) data in order to impose constraints on the exponent of Barrow entropy. The latter is an extended entropy relation arising from the incorporation of quantum-gravitational effects on the black-hole structure ...
John D. Barrow +2 more
doaj
Did the Universe start at Zero Metallicity?
, 1999 Standard Big Bang nucleosynthesis predicts an essentially zero primordial metallicity. I speculate on possible metal (i.e. nucleon number A\geq 12) production in scenarios of inhomogeneous Big Bang nucleosynthesis.
Jedamzik, K.
core +2 more sources
Nuclear Physics B - Proceedings Supplements, 1995 13 pages, including 4 figures, to appear in the Proceedings of the Workshop on ``Theoretical and Phenomenological Aspects of Underground Physics" (TAUP'95), Suppl. Nucl. Phys. B (M. Fatas, ed.)
openaire +3 more sources
Big Bang Nucleosynthesis (BBN) and Non-Standard Physics
EPJ Web of Conferences, 2018 A brief overview on standard big bang nucleosynthesis (shortly, SBBN) is presented. First, we describe the outcome of the SBBN concerning the abundances of the light elements up to 7Li.
Makki Tahani, El Eid Mounib
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Primordial Nucleosynthesis with a background magnetic field [PDF]
EPJ Web of Conferences, 2020 We present our recent detailed calculation of the impacts from a background magnetic field on Big Bang Nucleosynthesis (BBN). Namely, the magnetic field impacts on the electron-positron thermodynamics, time temper-ature relation and the screening ...
Luo Yudong +3 more
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Effects of a torsion field on Big Bang nucleosynthesis
, 1999 In this paper it is investigated whether torsion, which arises naturally in most theories of quantum gravity, has observable implications for the Big Bang nucleosynthesis.
C. N. Yang +18 more
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R-parity violation and the cosmological gravitino problem [PDF]
, 2001 Based on the R-parity violation option of the minimal supersymmetric Standard Model, we examine the scenario where the massive gravitino, relic from the hot big-bang, is the lightest supersymmetric particle and can decay through one or several of the ...
Chemtob, M., Moreau, G.
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New models and big bang nucleosynthesis constraints in f(Q) gravity
European Physical Journal C: Particles and Fields, 2023 The f(Q) theories of modified gravity arise from the consideration of non-metricity as the basic geometric quantity, and have been proven to be very efficient in describing the late-time Universe.
Fotios K. Anagnostopoulos +3 more
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Big bang nucleosynthesis with a stiff fluid [PDF]
Physical Review D, 2010 Models that lead to a cosmological stiff fluid component, with a density $ _S$ that scales as $a^{-6}$, where $a$ is the scale factor, have been proposed recently in a variety of contexts. We calculate numerically the effect of such a stiff fluid on the primordial element abundances.
Sourish Dutta, Robert J. Scherrer
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Toward a self-consistent and unitary reaction network for big-bang nucleosynthesis
EPJ Web of Conferences, 2014 Unitarity, the mathematical expression of the conservation of probability in multichannel reactions, is an essential ingredient in the development of accurate nuclear reaction networks appropriate for nucleosynthesis in a variety of environments.
Paris Mark W. +8 more
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