Neutron star in the presence of a torsion-dilaton field

Abstract

We develop the general theory of stars in Saa's model of gravity with propagating torsion and study the basic stationary state of a neutron star. Our numerical results show that the torsion force decreases the role of the gravity in the star configuration, leading to significant changes in the neutron star masses depending on the equation of state of star matter. The inconsistency of Saa's model with Roll - Krotkov - Dicke and Braginsky - Panov experiments is discussed.

Tensor mass and particle number peak at the same location in the scalar-tensor gravity boson star models - an analytical proof

“…ADM mass in Jordan frame), Keplerian mass M Kepler and the tensor one M T .As it has been shown numerically in [11] (see also [12]) these three masses differ significantly from each other in the case ω BD = −1.Keplerian mass leads to positive binding energy which means that every boson star solution is in general potentially unstable.Contrary, Schwarzschild mass leads to negative binding energy suggesting that every solution is potentially stable even for large central densities ρ =| Ψ(0) | 2 .…”

Neutron Stars in Mimetic Gravity

“…Moreover, generalization of GR to F (R) and F (G) gravities and their effects on neutron star structure are investigated before [6][7][8][9]. Furthermore, neutron stars in massive gravity and magnetized neutron stars in gravity's rainbow are analyzed in [10] and [11], respectively (see [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] for additional information about neutron stars in modified gravity theories).…”

Note on the mass–radius relations for spherical compact objects in general relativity with semi-classical corrections

“…The critical density arising within ECT for the simplest spin models is several orders of magnitudes lower than the Planck density. Compact objects in ECT and in theories of gravity with torsion have been considered in [46][47][48][49][50], while rotating fluids with torsion have been investigated in [51]. More recently Bohmer et al [52] and independently Luz and Carloni [53] have studied modifications to the TOV equation coming from ECT and determined the upper mass bound for some class of compact objects.…”