Feasible regions of GB phenomenon in extended Proca-Nuevo gravity
Malik Sultan A. Jawad A. Ur Rehman H. Myrzakulov N. Shaymatov S.
February 2026Elsevier B.V.
Physics of the Dark Universe
2026#51
In this article, we investigate the gravitational baryogenesis mechanism in the framework of Extended Proca-Nuevo gravity, a theory where a massive vector field is non-minimally coupled to the curvature. This analysis is carried out for an early universe, encompassing three separate cosmological scenarios defined by power-law, exponential, and modified exponential scale factors. By deriving the modified field equations from the EPN action, we obtain precise solutions for each scale factor, including the influence of the vector field. We compute the baryon-to-entropy ratio using the gravitational baryogenesis formalism, where the baryon asymmetry arises from a dynamical coupling of the baryon current with the derivative of the Ricci scalar. Moreover, we discuss the stability of the assumed cosmological model in two different ways, the dynamical system analysis and squared speed of sound parameter. Our findings demonstrate that the baryon-to-entropy ratio is consistent with observational constraints in all scenarios, highlighting the potential of EPN gravity as a viable theory to explain the matter-antimatter asymmetry in the early universe. Moreover, stability analysis through dynamical system leads to a deSitter stability which is a trivial case while squared speed of sound gives that system is stable for all three scale factor models. The study further stresses the contribution of anisotropy and vector field dynamics to the cosmological evolution within modified gravity models.
Extended Proca-Nuevo gravity , Feasible regions , GB phenomenon
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Department of Mathematics, University of Okara, Okara, 56300, Pakistan
Center for Theoretical Physics, Khazar University, 41 Mehseti Street, Baku, AZ1096, Azerbaijan
Department of Mathematics, COMSATS University Islamabad, Lahore-Campus, Lahore, -54000, Pakistan
Institute for Theoretical Physics and Cosmology, Zhejiang University of Technology, Hangzhou, 310023, China
L. N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Institute of Fundamental and Applied Research, National Research University TIIAME, Kori Niyoziy 39, Tashkent, 100000, Uzbekistan
University of Tashkent for Applied Sciences, Str. Gavhar 1, Tashkent, 100149, Uzbekistan
Tashkent State Technical University, Tashkent, 100095, Uzbekistan
Western Caspian University, Baku, AZ1001, Azerbaijan
Department of Mathematics
Center for Theoretical Physics
Department of Mathematics
Institute for Theoretical Physics and Cosmology
L. N. Gumilyov Eurasian National University
Institute of Fundamental and Applied Research
University of Tashkent for Applied Sciences
Tashkent State Technical University
Western Caspian University
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026