The cosmological constant as a boundary term by Wilfried Buchmüller, Norbert Dragon

“…In unimodular gravity the smallness of the observed cosmological constant has to be explained as a property of the initial state.…”
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Ultra-light Axions: Degeneracies with Massive Neutrinos and Forecasts for Future Cosmological Observations by Marsh, D, Macaulay, E, Trebitsch, M, Ferreira, P

“…It has recently been argued that many of these fields should be light and, like the well known QCD axion, lead to observable cosmological consequences. In this paper we study in detail the effect of the so-called string axiverse on large scale structure, focusing on the morphology and evolution of density perturbations, anisotropies in the cosmic microwave background and weak gravitational lensing of distant galaxies. …”

Quantum Spacetime Geometrization: QED at High Curvature and Direct Formation of Supermassive Black Holes from the Big Bang by Piero Chiarelli

“…The theory also provides an explanation for two phenomena: the existence of a cosmological pressure density similar to quintessence, which is compatible with the small value of the observed cosmological constant, and the breaking of matter–antimatter symmetry at high energies, offering insights into why there is an imbalance between the two in the early universe. …”
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Vacuum stability in stau-neutralino coannihilation in MSSM by Guang Hua Duan, Chengcheng Han, Bo Peng, Lei Wu, Jin Min Yang

“…The stau-neutralino coannihilation provides a feasible way to accommodate the observed cosmological dark matter (DM) relic density in the minimal supersymmetric standard model (MSSM). …”
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On the coverage of neutralino dark matter in coannihilations at the upgraded LHC by Murat Abdughani, Lei Wu

“…Abstract In the supersymmetric models, the coannihilation of the neutralino DM with a lighter supersymmetric particle provides a feasible way to accommodate the observed cosmological DM relic density. Such a mechanism predicts a compressed spectrum of the neutralino DM and its coannihilating partner, which results in the soft final states and makes the searches for sparticles challenging at colliders. …”
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Fermion masses and mixings, Leptogenesis and Baryon number violation in Pati-Salam model by Shaikh Saad

“…The automatic existence of the heavy Majorana neutrinos generate the extremely small light neutrino masses through the seesaw mechanism, which is also responsible for producing the observed cosmological matter-antimatter asymmetry of the universe. …”
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Vacuum Condensate Picture of Quantum Gravity by Herbert W. Hamber

“…Recent results point to significant deviations from classical gravity on distance scales approaching the effective infrared cutoff set by the observed cosmological constant. Such subtle quantum effects are expected to be initially small on current cosmological scales, but could become detectable in future high precision satellite experiments.…”
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Probing Spacetime Foam with Extragalactic Sources of High-Energy Photons by Y. Jack Ng, Eric S. Perlman

“…Another possibility that has recently become accessible is to use interferometers to observe cosmologically distant sources, thereby giving a large baseline perpendicular to the local wave vector over which the wave front could become corrugated and thus distorted, reducing or eliminating its fringe visibility. …”
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Crunching away the cosmological constant problem: dynamical selection of a small Λ by Itay M. Bloch, Csaba Csáki, Michael Geller, Tomer Volansky

“…Abstract We propose a novel explanation for the smallness of the observed cosmological constant (CC). Regions of space with a large CC are short lived and are dynamically driven to crunch soon after the end of inflation. …”
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On the uniqueness of ΛCDM-like evolution for homogeneous and isotropic cosmology in General Relativity by Saikat Chakraborty, Daniele Gregoris, B. Mishra

“…The astrophysical consequences of our findings are qualitatively discussed in light of observational cosmological tensions.…”
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Cosmological tests of $$f(R,G,\mathcal {T})$$ f ( R , G , T ) dark energy model in FRW universe by Himanshu Chaudhary, Amine Bouali, Niyaz Uddin Molla, Ujjal Debnath, G. Mustafa

“…The comparative analysis with $$\Lambda $$ Λ CDM, as well as the comprehensive diagnostic tests performed, demonstrate the efficacy and validity of our model in explaining the observed cosmological phenomena. These results contribute to the ongoing pursuit of accurate and comprehensive models that can provide a deeper understanding of the nature of our universe.…”
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