Possible existence of wormholes in the galactic halo region

Two observational results, the density profile from simulations performed in the $\Lambda$CDM scenario and the observed flat galactic rotation curves, are taken as input with the aim of showing that the galactic halo possesses some of the characteristics needed to support traversable wormholes. This result should be sufficient to provide an incentive for scientists to seek observational evidence for wormholes in the galactic halo region.Comment: 11 pages, 3 figures, 1 table, Eur. Phys. J. C (2014) 74:2750, DOI 10.1140/epjc/s10052-014-2750-

A new proposal for Galactic dark matter: Effect of f(T) gravity

It is still a challenging problem to the theoretical physicists to know the exact nature of the galactic dark matter which causes the galactic rotational velocity to be more or less a constant. We have proposed that the dark matter as an effect of f(T) gravity. Assuming the flat rotation curves as input we have shown that f(T) gravity can explain galactic dynamics. Here, we don' have to introduce dark matter. Spacetime metric inspired by f(T) gravity describes the region up to which the tangential velocity of the test particle is constant. This inherent property appears to be enough to produce stable circular orbits as well as attractive gravity.Comment: 7 pages and 1 figure. Minor corrections are made. Accepted for publication in Int.J.Theor.Phy

DFT calculated HOMO, LUMO energies, Ionisation potentials (Ip) and Electron affinity (EA) of studied aryldimesityl borane(DMB) derivative calculated.

a<p>Δ(HOMO)  = E(_{HOMO DMB derivative}) – E(HOMO_DMB),</p>b<p>Δ(LUMO)  = E(_{LUMO DMB derivative}) – E(HOMO_DMB),</p>c<p>Ip = E⁺(G)⁰- E⁰(G)⁰ and ^dEA(eV)  = E^-(G)⁰- E⁰(G)⁰.</p><p>DFT calculated HOMO, LUMO energies, Ionisation potentials (Ip) and Electron affinity (EA) of studied aryldimesityl borane(DMB) derivative calculated.</p

Plot of Hammett Parameter with (a) electron affinity (eV) and (b) ionization potential (eV).

<p>Plot of Hammett Parameter with (a) electron affinity (eV) and (b) ionization potential (eV).</p

Plot of geometrical change (dihedral angle) with the Hammett Parameter, for the series of studied DMB derivates.

<p>Plot of geometrical change (dihedral angle) with the Hammett Parameter, for the series of studied DMB derivates.</p

Schematic diagram of a two-layered OLED device.

<p>Schematic diagram of a two-layered OLED device.</p

Selected geometrical parameters (bond angles and bond lengths) of aryldimesityl borane (DMB) derivatives in neutral and anionic states calculated at B3PW91/6-311++G (d, p) level.

<p>Selected geometrical parameters (bond angles and bond lengths) of aryldimesityl borane (DMB) derivatives in neutral and anionic states calculated at B3PW91/6-311++G (d, p) level.</p