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- W3049072783 abstract "We study the generalized version of energy-momentum squared gravity (EMSG) in the Palatini formalism. This theory allows the existence of a scalar constructed with energy-momentum tensor as ${T}_{ensuremath{alpha}ensuremath{beta}}{T}^{ensuremath{alpha}ensuremath{beta}}$ in the generic action of the theory. We study the most general form of this theory in the Palatini framework and present the underlying field equations. The equations of motion of a massive test particle have been derived. The weak field limit of the theory is explored and the generalized version of the Poisson equation is obtained. Moreover, we explore the cosmological behavior of the theory with emphasis on bouncing solutions. Some new bouncing solutions for the specific Palatini EMSG model given by the Lagrangian density $mathcal{L}=R+ensuremath{beta}{R}^{2}+ensuremath{eta}{T}_{ensuremath{mu}ensuremath{nu}}{T}^{ensuremath{mu}ensuremath{nu}}$ are introduced. We show that only the case $ensuremath{eta}>0$ can lead to viable cosmic bounce." @default.
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- W3049072783 date "2020-09-08" @default.
- W3049072783 modified "2023-10-16" @default.
- W3049072783 title "Generalized energy-momentum-squared gravity in the Palatini formalism" @default.
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- W3049072783 doi "https://doi.org/10.1103/physrevd.102.064016" @default.
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