2019MNRAS.485.5652D

Query : 2019MNRAS.485.5652D

2019MNRAS.485.5652D - Mon. Not. R. Astron. Soc., 485, 5652-5665 (2019/June-1)

Exploring physical features of anisotropic strange stars beyond standard maximum mass limit in f(R, T) gravity.

DEB D., KETOV S.V., MAURYA S.K., KHLOPOV M., MORAES P.H.R.S. and RAY S.

Abstract (from CDS):

We study a specific model of anisotropic strange stars in the modified f(R, T)-type gravity by deriving solutions to the modified Einstein field equations representing a spherically symmetric anisotropic stellar object. We take a standard assumption that f(R, T)=R+2χT, where R is Ricci scalar, T is the trace of the energy-momentum tensor of matter, and χ is a coupling constant. To obtain our solution to the modified Einstein equations, we successfully apply the 'embedding class one' techniques. We also consider the case when the strange quark matter (SQM) distribution is governed by the simplified MIT bag model equation of state given by pr=1/€3(ρ–4B), where B is bag constant. We calculate the radius of the strange star candidates by directly solving the modified TOV equation with the observed values of the mass and some parametric values of B and chi. The physical acceptability of our solutions is verified by performing several physical tests. Interestingly, besides the SQM, another type of matter distribution originates due to the effect of coupling between the matter and curvature terms in the f(R, T) gravity theory. Our study shows that with decreasing the value of chi, the stellar systems under investigations become gradually massive and larger in size, turning them into less dense compact objects. It also reveals that for chi < 0 the f(R, T) gravity emerges as a suitable theory for explaining the observed massive stellar objects like massive pulsars, super–Chandrasekhar stars, and magnetars, etc., which remain obscure in the standard framework of General Relativity.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): black hole physics - gravitation - hydrodynamics - methods: analytical - stars: neutron - pulsars: general

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SN 2007if SN* 01 10 51.37 +15 27 39.9   23.3 19.5     SNIap 142 1
2 SK 160 HXB 01 17 05.1457288392 -73 26 36.014808156 12.23 13.00 13.15   13.17 O9.7Ia+ 918 0
3 X LMC X-4 HXB 05 32 49.5556042296 -66 22 13.202721768   13.9 14.0 14.290   O8III 714 0
4 V* GP Vel HXB 09 02 06.8608812864 -40 33 16.899168060 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1588 0
5 V* V779 Cen HXB 11 21 15.0920532528 -60 37 25.630264596   14.4 12.27     O9III/Veq 1159 0
6 SN 2003fg SN* 14 16 18.924 +52 14 53.68           SNIa 141 1
7 V* QV Nor HXB 15 42 23.3633146128 -52 23 09.577395960   16.3 14.5     B0.2Ia 455 1
8 SN 2009dc SN* 15 51 12.12 +25 42 28.0           SNIa-norm 188 1
9 V* QX Nor LXB 16 12 43.0 -52 25 26           ~ 946 1
10 PSR J1614-2230 Psr 16 14 36.50974 -22 30 31.5420           ~ 452 1
11 V* HZ Her LXB 16 57 49.8110126616 +35 20 32.486555472 11.90 14.89 13.63 13.88   B3/6ep 2172 0
12 NAME TER 5 X-1 LXB 17 48 05.225 -24 46 47.66           ~ 229 1
13 SAX J1808.4-3658 LXB 18 08 27.58 -36 58 43.9           ~ 1051 0
14 SN 2006gz SN* 18 10 26.33 +30 59 44.4   16.6       SNIa 156 1
15 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 1056 1
16 PSR J1903+0327 Psr 19 03 05.7937 +03 27 19.222           ~ 187 1
17 PSR J2215+51 Psr 22 15 32.6869149432 +51 35 36.400854912           ~ 176 0

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