ChemInform Abstract: Synthesis of the New Heterocyclic System 1H‐1,4,7,10,13,16‐ Hexaoxacyclooctadecaen‐2‐(2,3‐f)indole.

Mon. Not. R. Astron. Soc.

Rieger

2016

The Crab Pulsar has been recently detected at very high energies (VHE) with its pulsed VHE emission reaching up to 1.5 TeV. The VHE peaks appear synchronised with the peaks at GeV energies and show VHE spectra following hard power-law functions. These new findings have been interpreted as evidence for a gamma-ray production that happens very close to the light cylinder. Motivated by these experimental results we consider the efficiency of magnetocentrifugal particle acceleration in the magnetosphere of the Crab Pulsar, reexamining and extending results obtained in a previous work (Osmanov & Rieger 2009). It is shown that efficient magnetocentrifugal acceleration close to the light cylinder could provide the required electron Lorentz factors of 5 × 10 6 and that the resulting inverse Compton (IC) scattering off thermal photons might explain the enigmatic TeV emission of the pulsar. We estimate the corresponding VHE luminosity and provide a derivation of its spectral characteristics, that appear remarkably close to the observational results to encourage further studies.

Section: Trajectories -The Archimedean Spiral As Attractormentioning

confidence: 82%

Pulsed VHE emission from the Crab Pulsar in the context of magnetocentrifugal particle acceleration

Mon. Not. R. Astron. Soc.

Rieger

2016

“…Corresponding three dimensional generalisation has been studied for the Crab pulsar (Ref. 15). In the present work we apply the developed model to study the dynamics of particles on rotating magnetic field lines in the WH metrics.…”

Section: Introductionmentioning

confidence: 99%

Particles on the rotating channels in the wormhole metrics

Arsenadze

2017

Int. J. Mod. Phys. D

In the Ellis-Bronnikov wormhole (WH) metrics the motion of a particle along curved rotating channels is studied. By taking into account a prescribed shape of a trajectory we derive the reduced $1+1$ metrics, obtain the corresponding Langrangian of a free particle and analytically and numerically solve the corresponding equations of motion. We have shown that if the channels are twisted and lag behind rotation, under certain conditions beads might asymptotically reach infinity, leaving the WH, which is not possible for straight co-rotating trajectories. The analytical and numerical study is performed for two and three dimensional cases and initial conditions of particles are analysed in the context of possibility of passing through the WH.Comment: 12 pages, 7 figure

“…A series of articles has been dedicated to mechanism of magnetocentrifugal acceleration in the magnetospheres of pulsars and AGNs (Ref. [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Centrifugal acceleration in the isotropic photon field

Bakhtadze

Berezhiani

2017

Int. J. Mod. Phys. D

In this paper we study centrifugal acceleration of particles moving along a prescribed rotating curved trajectories. We consider the physical system embedded in an isotropic photon field and study the influence of the photon drag force on the acceleration process. For this purpose we study three major configurations of the field lines: the straight line; the Archimede's spiral and the dipolar field line configuration. By analysing dynamics of particles sliding along the field lines in the equatorial plane we have found several interesting features of motion. In particular, it has been shown that for rectilinear field lines the particles reach the light cylinder (area where the linear velocity of rotation exactly equals the speed of light) zone relatively slowly for bigger drag forces. Considering the Archimede's spiral, we have found that in cases when the field lines lag behind the rotation, the particles achieve the force-free regime of dynamics regardless of the drag force. Unlike this scenario, when the spiral is oriented in an opposite direction the particles do not reach the force free regime, but tend to stable equilibrium locations. Such a behaviour has been found for straight field lines as well.