544 research outputs found
Boson stars in the centre of galaxies?
We investigate the possible gravitational redshift values for boson stars
with a self-interaction, studying a wide range of possible masses. We find a
limiting value of z_lim \simeq 0.687 for stable boson star configurations. We
can exclude the direct observation of boson stars. X-ray spectroscopy is
perhaps the most interesting possibility
Sistema de impuestos eclesiásticos en Alemania.
Material incluido en el volumen especial de la revista del Instituto Martín de Azpilcueta, Universidad de Navarra : Ius Canonicum (1999), en honor de Javier Hervada
Axially deformed solution of the Skyrme-Hartree-Fock-Bogolyubov equations using the transformed harmonic oscillator basis (III) hfbtho (v3.00): a new version of the program
We describe the new version 3.00 of the code HFBTHO that solves the nuclear
Hartree-Fock (HF) or Hartree-Fock-Bogolyubov (HFB) problem by using the
cylindrical transformed deformed harmonic oscillator basis. In the new version,
we have implemented the following features: (i) the full Gogny force in both
particle-hole and particle-particle channels, (ii) the calculation of the
nuclear collective inertia at the perturbative cranking approximation, (iii)
the calculation of fission fragment charge, mass and deformations based on the
determination of the neck (iv) the regularization of zero-range pairing forces
(v) the calculation of localization functions (vi)MPI interface for large-scale
mass table calculations.Comment: 29 pages, 3 figures, 4 tables; Submitted to Computer Physics
Communication
Tomographic RF Spectroscopy of a Trapped Fermi Gas at Unitarity
We present spatially resolved radio-frequency spectroscopy of a trapped Fermi
gas with resonant interactions and observe a spectral gap at low temperatures.
The spatial distribution of the spectral response of the trapped gas is
obtained using in situ phase-contrast imaging and 3D image reconstruction. At
the lowest temperature, the homogeneous rf spectrum shows an asymmetric
excitation line shape with a peak at 0.48(4) with respect to the
free atomic line, where is the local Fermi energy
The gravitational redshift of boson stars
We investigate the possible gravitational redshift values for boson stars
with a self-interaction, studying a wide range of possible masses. We find a
limiting value of for stable boson star configurations.
We compare theoretical expectation with the observational capabilities in
several different wavebands, concluding that direct observation of boson stars
by this means will be extremely challenging. X-ray spectroscopy is perhaps the
most interesting possibility.Comment: 7 pages RevTeX file with five figures incorporated (uses RevTeX and
psfig
Rotating Boson Stars in 5 Dimensions
We study rotating boson stars in five spacetime dimensions. The boson fields
consist of a complex doublet scalar field. Considering boson stars rotating in
two orthogonal planes with both angular momenta of equal magnitude, a special
ansatz for the boson field and the metric allows for solutions with nontrivial
dependence on the radial coordinate only. The charge of the scalar field equals
the sum of the angular momenta. The rotating boson stars are globally regular
and asymptotically flat. For our choice of a sixtic potential the rotating
boson star solutions possess a flat spacetime limit. We study the solutions in
flat and curved spacetime.Comment: 17 pages, 6 figure
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