Results 21 to 30 of about 22,632 (204)
Big-Bang Nucleosynthesis after Planck [PDF]
Journal of Cosmology and Astroparticle Physics, 2019 We assess the status of big-bang nucleosynthesis (BBN) in light of the final Planck data release and other recent developments, and in anticipation of future measurements.
B. Fields +3 more
semanticscholar +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
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
doaj +1 more source
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
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
doaj +1 more source
Big bang nucleosynthesis constraints on sterile neutrino and lepton asymmetry of the Universe [PDF]
Journal of Cosmology and Astroparticle Physics, 2020 We consider the cosmological effects of sterile neutrinos with the masses of 150–450 MeV . The decay of sterile neutrinos changes the thermal history of the Universe and affects the energy density of radiation at recombination and the big bang ...
G. Gelmini +4 more
semanticscholar +1 more source
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
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
doaj +1 more source
Quintessence and the Swampland: The Numerically Controlled Regime of Moduli Space
Fortschritte der Physik, Volume 70, Issue 4, April 2022., 2022 Abstract We provide a detailed discussion of the main theoretical and phenomenological challenges of quintessence model building in any numerically controlled regime of the moduli space of string theory. We argue that a working quintessence model requires a leading order non‐supersymmetric (near) Minkowski vacuum with an axionic flat direction.
Michele Cicoli +3 more
wiley +1 more source