# Search results for: Ciprian Dariescu

General Relativity and Gravitation > 2018 > 50 > 10 > 1-13

International Journal of Theoretical Physics > 2018 > 57 > 8 > 2280-2292

*S*

*O*(3,1) −gauge invariant pseudo-orthonormal (Cartan) formalism, in the present paper, we are going to deal with the Einstein–Nambu–Goldstone system of equations, for a manifold with at least

*G*

_{4}up to

*G*

_{6}group of motion and a massless source-field excited along the

*z*−direction. This is also equivalent with the pure radiation energy–momentum tensor coming from circularly polarized waves generated...

International Journal of Theoretical Physics > 2018 > 57 > 3 > 652-663

General Relativity and Gravitation > 2017 > 49 > 12 > 1-14

International Journal of Theoretical Physics > 2016 > 55 > 9 > 4109-4123

*Z*

_{2}− symmetry breaking scalar field, depending on time alone, we have derived the Einstein–Gordon system of equations. For physically relevant cases, the matter-curvature system have been numerically analyzed.

International Journal of Theoretical Physics > 2016 > 55 > 2 > 1116-1127

*A*

*d*

*S*

_{5}bulk with

*k*=−1− FRW branes, together with bosons test particles, evolving in the 5D hyperspace. In the first part, we compute the wave function of the scalar fields in the bulk and the allowed mass spectrum for physically relevant cases. Also, an important quantization law, connecting the mass spectrum of the bosons on the brane and...

Astrophysics and Space Science > 2016 > 361 > 6 > 1-7

Foundations of Physics > 2015 > 45 > 11 > 1495-1513

International Journal of Theoretical Physics > 2015 > 54 > 10 > 3788-3798

*A*

*d*

*S*

_{5}bulk, with

*k*= −1−RW branes, assuming that the scalar field supporting the geometry is depending on the fifth coordinate alone. For the derived scale function and warp factor, we write down the full expression of the orthonormal modes characterizing the scalar test particle, pointing out the...

International Journal of Theoretical Physics > 2015 > 54 > 7 > 2446-2452

*k*= 0)−FRW brane embedded in a five dimensional bulk and significant results derived within the Weyl integrable geometry.

Open Physics > 2014 > 12 > 7 > 453-459

Open Physics > 2014 > 12 > 7 > 453-459

Central European Journal of Physics > 2014 > 12 > 7 > 453-459

*bounded*states...

International Journal of Theoretical Physics > 2014 > 53 > 9 > 3239-3245

Astroparticle Physics > 2013 > 46 > Complete > 34-39

Astrophysics and Space Science > 2013 > 344 > 2 > 529-535

*k*=0–FRW Universe, with a perfect fluid in the bulk. By solving the Einstein’s Equations, we get the corresponding scale function,

*a*, and the warp factor. Particular attention is given to the effective potential

*V*(

*a*), which is used in solving both the Wheeler-DeWitt equation and the stationary Schrödinger equation. Inspired by similar considerations...

Astrophysics and Space Science > 2013 > 346 > 1 > 225-231

International Journal of Theoretical Physics > 2013 > 52 > 4 > 1345-1353

*k*=0—FRW Universe. For small values of the cosmological scale factor,

*a*, the wave function of the Universe is expressed in terms of the

*Heun Double Confluent*functions, which have been intensively worked out in the last years. As expected, for large

*a*’s, one...

International Journal of Theoretical Physics > 2012 > 51 > 2 > 526-535

Astrophysics and Space Science > 2012 > 341 > 2 > 429-435

*Oz*and decaying in time, we deal with the Dirac-type equation characterizing the fermions evolving in magnetar’s crust. For ultra-relativistic particles, one can employ the perturbative approach, to compute the conserved current density components. If the magnetic field is frozen and the magnetar is treated as a stationary object, the fermion’s wave function...