In this paper,we present several explicit reconstructions for the aether scalar tensor(AeST)theory derived from the background of the Friedmann-Lematre-Robertson-Walker cosmological evolution.It is shown that th
When ωμ is a gradient vector field, that is, when there exists a scalar field, φ, such that ωμ = φ,μ, then the Weyl geometry reduces to the so-called Weyl integrable geometry. In Weyl integrable geometry, the Ricci tensor R˜μν is related to the Riemannian Ricci tensor R...
Odintsov, Late-time cosmology in a (phantom) scalar-tensor theory: dark energy and the cosmic speed- up. Phys. Rev. D 70(4), 043539 (2004). https://doi.org/10.1103/ PhysRevD.70.043539 33. C. Armendariz-Picon, V. Mukhanov, P.J. Steinhardt, Dynamical solution to the problem of a...
vector G i (G i G j g ij = 1), which to-gether with metric tensor g ij constitute the dynamic variables of theEinstein-aether theory. The equations of motion for g ij and for G i arederived by variational method from a Lagrangian that is a function ofthe metric tensor g ij and ...
We decompose these terms with respect to the irreducible parts of the covariant derivative of the aether velocity, namely, the acceleration four-vector, the shear and vorticity tensors, and the expansion scalar. Furthermore, we discuss the influence of an aether non-uniform motion on the ...
High Energy Physics - TheoryThe extended Einstein-Maxwell-aether-axion model describes internal interactions inside the system, which contains gravitational, electromagnetic fields, the dynamic unit vector field describing the velocity of an aether, and the pseudoscalar field associated with the axionic ...
We consider a canonical scalar inflaton coupled, through its potential, to the divergence of a fixed-norm timelike vector field, or "aether." The vector is described by Einstein-aether theory, a vector-tensor model of gravitational Lorentz violation. We derive and analyze the cosmological ...
2 Wormhole-like static aether solution The Einstein aether theory is a vector tensor theory which violates Lorentz invariance by connecting the metric to a 123 Eur. Phys. J. C (2022) 82:1057 Page 3 of 10 1057 unit time-like vector field (the aether field) at every point in space. ...
For the space-time with pp-wave symmetry the Ricci scalar vanishes; in the case when λ = 0 we have to state that the trace of the stress-energy tensor is vanishing, T (U) = 0. Thus, we obtain from (17) 2(C1 + C3) am am − √1 (C1 + 4C2 + C3) 2 2.4 Extended ...
SYMMETRYGRAVITATIONAL wavesPOTENTIAL functionsSCALAR field theoryEINSTEIN field equationsIn this paper, we explore an Einstein-aether cosmological model by adding the scalar field in which it has an interaction with the aether field. For the cosmological implications of the model, we consider that the ...