214 citations · 1.8k across the 77 of their papers we have counts for
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Gravitation, electromagnetism and the cosmological constant in purely affine gravity
Nikodem J. Poplawski
The Eddington Lagrangian in the purely affine formulation of general relativity generates the Einstein equations with the cosmological constant. The Ferraris-Kijowski purely affine…
The cosmic snap parameter in f(R) gravity
Nikodem J. Poplawski
We derive the expression for the snap parameter in f(R) gravity. We use the Palatini variational principle to obtain the field equations and regard the Einstein conformal frame as…
On the nonsymmetric purely affine gravity
Nikodem J. Poplawski
We review the vacuum purely affine gravity with the nonsymmetric connection and metric. We also examine dynamical effects of the second Ricci tensor and covariant second-rank tenso…
A Lagrangian description of interacting dark energy
Nikodem J. Poplawski
We propose a relativistically covariant model of interacting dark energy based on the principle of least action. The cosmological term in the gravitational Lagrangian is a func…
The cosmic jerk parameter in f(R) gravity
Nikodem J. Poplawski
We derive the expression for the jerk parameter in gravity. We use the Palatini variational principle and the field equations in the Einstein conformal gauge. For the partic…
Interacting dark energy in gravity
Nikodem J. Poplawski
The field equations in gravity derived from the Palatini variational principle and formulated in the Einstein conformal frame yield a cosmological term which varies with tim…