Strange stars in Krori–Barua spacetime under f(R,T) gravity
- Department of Physics, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, West Bengal, 711103 (India)
- Department of Physics, Government College of Engineering and Ceramic Technology, Kolkata 700010, West Bengal (India)
- Department of Mathematics, Jadavpur University, Kolkata 700032, West Bengal (India)
Highlights: We study anisotropic strange star in f(R,T) gravity under Krori–Barua spacetime.The set of solutions provides non-singular as well as stable stellar model. Using observed values for mass and radius, we calculate different physical parameters. The coupling constant χ, between matter and geometry, is the key factor in f(R,T) gravity. - Abstract: In the present work, we study about highly dense compact stars which are made of quarks, specially strange quarks, adopting the Krori–Barua (KB) (Krori and Barua, 1975) metric in the framework of f(R,T) gravity. The equation of state (EOS) of a strange star can be represented by the MIT bag model as pr(r)=(1/3)[ρ(r)-4Bg] where Bg is the bag constant, arises due to the quark pressure. Main motive behind our study is to find out singularity free and physically acceptable solutions for different features of strange stars. Here we also investigate the effect of alternative gravity in the formation of strange stars. We find that our model is consistent with various energy conditions and also satisfies Herrera’s cracking condition, TOV equation, static stability criteria of Harrison–Zel'dovich–Novikov etc. The value of the adiabatic indices as well as the EOS parameters re-establishes the acceptability of our model. Here in detail we have studied specifically three different strange star candidates, viz. PSRJ 1614 2230,Vela X-1 and Cen X-3. As a whole, present model fulfils all the criteria for stability. Another fascinating point we have discussed is the value of the bag constant which lies in the range (40-45) MeV/fm3. This is quite smaller than the predicted range, i.e., (55–75) MeV/fm3 (Farhi and Jaffe, 1984 [2]; Alcock et al., 1986 [3]). The presence of the constant (χ), arises due to the coupling between matter and geometry, is responsible behind this reduction in Bg value. For χ=0, we get the higher value for Bg as the above mentioned predicted range.
- OSTI ID:
- 22852385
- Journal Information:
- Annals of Physics, Journal Name: Annals of Physics Vol. 401; ISSN APNYA6; ISSN 0003-4916
- Country of Publication:
- United States
- Language:
- English
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