Results 1 to 10 of about 22,632 (204)
Constraining f(T) teleparallel gravity by big bang nucleosynthesis [PDF]
European Physical Journal C: Particles and Fields, 2017 We use Big Bang Nucleosynthesis (BBN) observational data on the primordial abundance of light elements to constrain f(T) gravity. The three most studied viable f(T) models, namely the power law, the exponential and the square-root exponential are ...
S. Capozziello +2 more
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Constraints on Tsallis Cosmology from Big Bang Nucleosynthesis and the Relic Abundance of Cold Dark Matter Particles. [PDF]
Entropy (Basel), 2023 By employing Tsallis’ extensive but non-additive δ-entropy, we formulate the first two laws of thermodynamics for gravitating systems. By invoking Carathéodory’s principle, we pay particular attention to the integrating factor for the heat one-form.
Jizba P, Lambiase G.
europepmc +3 more sources
The Neutron Mean Life and Big Bang Nucleosynthesis [PDF]
Universe, 2023 We explore the effect of neutron lifetime and its uncertainty on standard big bang nucleosynthesis (BBN). BBN describes the cosmic production of the light nuclides, 1H, D, 3H+3He, 4He, and 7Li+7Be, in the first minutes of cosmic time.
Tsung-Han Yeh +2 more
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Compatibility of big bang nucleosynthesis in some modified gravities
European Physical Journal C: Particles and Fields, 2022 This paper is devoted to investigate the implications of Einstein-Aether and modified Hořava–Lifshitz theories of gravity to the formation of light elements in the early universe named as big bang nucleosynthesis.
Abdul Malik Sultan, Abdul Jawad
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New models and big bang nucleosynthesis constraints in f(Q) gravity [PDF]
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 Constraints on f (T, TG) Gravity [PDF]
Universe, 2022 We confront f(T,TG) gravity, with big bang nucleosynthesis (BBN) requirements. The former is obtained using both the torsion scalar, as well as the teleparallel equivalent of the Gauss–Bonnet term, in the Lagrangian, resulting to modified Friedmann ...
Petros Asimakis +3 more
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Big Bang Nucleosynthesis constraints on Barrow entropy [PDF]
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
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Primordial big bang nucleosynthesis and generalized uncertainty principle [PDF]
European Physical Journal C: Particles and Fields, 2021 The Generalized Uncertainty Principle (GUP) naturally emerges in several quantum gravity models, predicting the existence of a minimal length at Planck scale.
Giuseppe Gaetano Luciano
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Challenges to the standard model of Big Bang nucleosynthesis. [PDF]
Proc Natl Acad Sci U S A, 1993 Steigman G.
europepmc +2 more sources
Dark Radiation from Neutrino Mixing after Big Bang Nucleosynthesis. [PDF]
Physical Review Letters, 2023 Light dark fermions can mass mix with the standard model (SM) neutrinos. As a result, through oscillations and scattering, they can equilibrate in the early universe.
Daniel Aloni +3 more
semanticscholar +1 more source