The attribute of rotational profile to the hyperon puzzle in the prediction of heaviest compact star

Abstract

In this theoretical study, we report an investigation of the equations of state (EoSs) of hyper-nuclear matter and its composition as a function of density within the framework of effective field theory motivated relativistic mean field model. We have used G2 force parameter along with various hyperon-meson coupling ratios by allowing the mixing and the breaking of SU(6) symmetry to predict the EoSs, keeping the nucleonic coupling constant intact. We have estimated the properties of nonrotating and rapidly rotating configuration of compact stars by employing four different representative sets of equations of state. The obtained results of the mass and radius for the compact stars are compared with the recent mass observations. Further, we have studied the stability and sensitivity of rotational frequency (at sub-millisecond period) on the configuration of the compact stars because the angular frequency is significantly smaller than the mass-shedding (Keplerian) frequency in slow rotation regime. Moreover, the yield of hyperon as a function of density for various hyperon-meson couplings are also estimated.

Impacts of dark matter on the $f$-mode oscillation of hyperon star

“…The detailed discussion on hyperons productions and interactions with mesons and their coupling parameters had been studied in Refs. [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. Although different approaches had been tried to solve the issues such as (i) potential depths for each hyperon, (ii) coupling between hyperons-mesons, and (iii) hyperon puzzle, but these are still an open problems.…”

Effects of $ϕ$-meson on properties of hyperon stars in density dependent relativistic mean field model

“…Different theoretical approaches have been used to study the properties of homogeneous nuclear matter, including ab initio (Zuo et al 2002a,b;Baldo & Maieron 2004;Dickhoff & Barbieri 2004;Bombaci et al 2005;Lee 2009;Baldo et al 2012;Carlson et al 2015) and phenomenological (Glendenning 1985;Rikovska Stone et al 2003;Stone & Reinhard 2007;Dutra et al 2012;Sellahewa & Rios 2014;Dutra et al 2014;Whittenbury et al 2014) approaches, and these studies cover large ranges of baryon number density, temperature, and isospin asymmetry. The relativistic mean field (RMF) model, one of the phenomenological models, provides an excellent tool to study the properties of infinite nuclear matter (Chin & Walecka 1974;Walecka 1974;Glendenning 1996;Shen & Ren 1999;Shen 2002;Shen et al 2011;Zhao & Jia 2012;Zhao 2014;Dutra et al 2014;Meng et al 2016;Mu et al 2017;Bhuyan et al 2017;Biswal et al 2019;Tong et al 2020). In the framework of the RMF model, the baryons are treated as point particles and interact with each other through the exchange of scalar and vector mesons (Walecka 1974;Glendenning 1985).…”

“…However, the appearance of hyperons results in the hyperon puzzle: Hyperons strongly soften the EoS so that the maximum mass is not compatible with observations (Schulze et al 2006;Vidaña 2013). The solution of the hyperon puzzle requires additional repulsive interaction between baryons (Vidaña 2013) and mechanisms that provide such repulsion include: (a) Addition of the repulsive hyperonic three-body force (Lonardoni et al 2015;Wirth & Roth 2016); (b) a deconfinement phase transition to quark matter below the hyperon thresholds (Weissenborn et al 2011;Bonanno & Sedrakian 2012;Klähn et al 2013); (c) addition of the repulsive hyperonic interaction by exchanging vector meson (Weissenborn et al 2012;Maslov et al 2015;Bhuyan et al 2017). In the framework of the RMF model, the additional repulsive interaction between hyperons can be achieved by including the strange meson φ (Schaffner & Mishustin 1996;Zhao 2015;Fortin et al 2017).…”

Constraining nuclear matter parameters and neutron star observables using PREX-2 and NICER data

“…It has a unique internal structure, where all the four fundamental forces play an essential role. Study of the NS reveals that the internal structure is more complicated because new degrees of freedom like hyperons [2][3][4][5][6][7][8][9] and quarks are in the core [10][11][12]. To explore its properties, such as mass, radius and tidal deformability, etc., one has to consider the interaction between nucleons in the form of interaction Lagrangian.…”