Results 21 to 30 of about 20,829 (241)
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
doaj +1 more source
Annalen der Physik, Volume 535, Issue 12, December 2023., 2023 This article describes the implementation of low‐frequency axion haloscope setups inside the future BabyIAXO magnet. The RADES proposal has a potential sensitivity to the axion‐photon coupling down to values corresponding to the KSVZ model, in the mass range between 1 and 2 μ$\umu$eV.
Saiyd Ahyoune +29 more
wiley +1 more source
Black holes as “time capsules”: A cosmological graviton background and the Hubble tension
Astronomische Nachrichten, Volume 344, Issue 1-2, January-February 2023., 2023 Abstract Minuscule primordial black holes (BHs) before the end and after inflation can serve as “time capsules” bringing back energy from the past to a later epoch when they evaporate. As these BHs behave like matter, while the rest of the universe's content behaves like radiation, the mass fraction of these BHs, which is tiny at formation, becomes ...
Tsvi Piran, Raul Jimenez
wiley +1 more source
Constraints on ultralight scalar dark matter with quadratic couplings
Journal of High Energy Physics, 2023 Ultralight dark matter is a compelling dark matter candidate. In this work, we examine the impact of quadratically-coupled ultralight dark matter on the predictions of Big Bang Nucleosynthesis.
Thomas Bouley +2 more
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Dark Energy from Cosmological Energy Conservation
Advances in Astronomy, Volume 2023, Issue 1, 2023., 2023 The value of the gravitational wave energy density is unknown. Current progress in gravitational wave detection suggests that the energy density of the stochastic gravitational wave background (SGWB) will be estimated in the next decades. A derivation of its value is presented under the assumption that energy lost due to cosmic redshift is fully ...
Manuel Uruena Palomo, Rubab Manzoor
wiley +1 more source
No crisis for big bang nucleosynthesis [PDF]
Physical Review D, 1996 Contrary to a recent claim, the inferred primordial abundances of the light elements are quite consistent with the expectations from standard big bang nucleosynthesis when attention is restricted to direct observations rather than results from chemical evolution models.
Kernan, P, Sarkar, S
openaire +4 more sources
The Challenge of Getting Earth and Space Science Into U.S. High Schools
Perspectives of Earth and Space Scientists, Volume 3, Issue 1, December 2022., 2022 Abstract The Next Generation Science Standards (NGSS), which have now been adopted or adapted by 45 states and Washington, D.C., as their public K‐12 science education standards, are not only revolutionizing the way science is taught but are providing significant opportunities for an increased presence of Earth and space science (ESS) in public high ...
M. E. Wysession
wiley +1 more source
, 2022 As the early universe expands and cools the rates of the weak interactions that keep neutrinos in thermal equilibrium with the matter and the related rates of the reactions that inter-convert neutrons and protons decrease. Eventually, these rates fall below the expansion rate -- they freeze out.
Grohs, Evan, Fuller, George M.
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Big Bang nucleosynthesis as a probe of new physics [PDF]
EPJ Web of Conferences, 2023 The Big Bang Nucleosynthesis (BBN) model is a cornerstone for the understanding of the evolution of the early universe, making seminal predictions that are in outstanding agreement with the present observation of light element abundances in the universe.
Bertulani Carlos A. +2 more
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BBN constraints on universally-coupled ultralight scalar dark matter
Journal of High Energy Physics, 2020 Ultralight scalar dark matter can interact with all massive Standard Model particles through a universal coupling. Such a coupling modifies the Standard Model particle masses and affects the dynamics of Big Bang Nucleosynthesis. We model the cosmological
Sergey Sibiryakov +2 more
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