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  • 1
    Digitale Medien
    Digitale Medien
    Relativistic hydrogen atom: Wave equation in Whittaker form (1993)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 34 (1993), S. 4964-4974 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: For the hydrogen atom, a single relativistic wave equation in Whittaker form was derived which yields the energy level spectrum, the same as that given by the Dirac (coupled system of) equations. Unlike the usual treatments of the Dirac equation, the solutions presented here do not diverge at infinity, in fact they approach zero. Also, for Z〈119, it is shown that the usual energy levels follow; however, for 119〈Z〈137 the spectrum depends on a free parameter.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.530422
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  • 2
    Digitale Medien
    Digitale Medien
    Energy level degeneracy (1993)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 34 (1993), S. 12-22 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: The nondegeneracy theorem for one-dimensional systems is reviewed herein. After considering Loudon's contention that this theorem does not apply in the presence of singular potentials, an example (in support of his assertion) which involves a singular potential with degenerate eigenstates is presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.530394
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  • 3
    Digitale Medien
    Digitale Medien
    An example of induced centrifugal force in general relativity (1982)
    [s.l.] : Nature Publishing Group
    Nature 298 (1982), S. 829-829 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] As pointed out elsewhere2, velocity-dependent density distributions can give terms easily misinterpretable as centrifugal force?a difficulty which can be circumvented by treating a body for which the symmetry of the density distribution is velocity-independent; such a body is a rotating cylindrical ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/298829a0
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  • 4
    Digitale Medien
    Digitale Medien
    Rotational Properties of Neutron Star Models (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 566-567 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] If the Crab pulsar is a neutron star with mass, radius and angular velocity of the order of a solar mass, 12 km, and 30 revolutions per second, respectively, then the gravitational acceleration at the surface is of the order of 104 times the "centripetal" acceleration. Similarly, the square of the ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/224566a0
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  • 5
    Digitale Medien
    Digitale Medien
    Centrifugal Force and General Relativity (1970)
    [s.l.] : Nature Publishing Group
    Nature 228 (1970), S. 849-849 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Using the weak field form of Einstein's equations, Thirring1'2 found the metric associated with a slowly rotating mass shell of mass m, radius r0 and angular velocity co. Inside the shell, the geodesic equations contain terms proportional to co and to2. These terms enter the equations of motion in ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/228849a0
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  • 6
    Digitale Medien
    Digitale Medien
    Pulsar Models (1968)
    [s.l.] : Nature Publishing Group
    Nature 219 (1968), S. 1009-1012 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] A model for pulsars based on vibrating white dwarf stars accounts for a number of the features of the emissions, and also gives rise to the possibility of optical fluctuations having a period twice that of the radio ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/2191009a0
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  • 7
    Digitale Medien
    Digitale Medien
    SUMMARY OF THE WORKSHOP ON RADIATION PROCESSES IN STRONG GRAVITATIONAL FIELDS (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 375 (1981), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1981.tb33718.x
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  • 8
    Digitale Medien
    Digitale Medien
    γ-Rays from Her X-1 (1986)
    Springer
    Astrophysics and space science 128 (1986), S. 355-361 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Recent observations have detected bursts of extremely high energy pulsed (1.24 s)γ-rays (1012 eV to 5×1014 eV) from Her X-1. We propose a model for producing theseγ-rays.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00644583
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  • 9
    Digitale Medien
    Digitale Medien
    Neutron star models based on an improved equation of state (1970)
    Springer
    Astrophysics and space science 6 (1970), S. 228-239 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Using an equation of state for cold degenerate matter which takes nuclear forces and nuclear clustering into account, neutron star models are constructed. Stable models were obtained in the mass range above 0.065M ⊙ and density range 1014.08 to 1015.4 gm/cm3. All of these models were found to be bound. The outer crystalline layer of the star was found to have a thickness of 200 m or more depending on the mass of the model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00651224
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  • 10
    Digitale Medien
    Digitale Medien
    Schwarzschild electrodynamics: Black holes, neutron stars (1978)
    Springer
    Astrophysics and space science 56 (1978), S. 129-190 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We present a number of calculations involving the production and propagation of electromagnetic waves in the Schwarzschild metric. They are based on algorithms developed from the power series solutions of the Schwarzschild radial equation (Regge-Wheeler equation) of Arenstorf, Cohen and Kegeles. These include the scattering of electromagnetic plane waves from a Schwarzschild black hole where we find that previous approximate and numerical work is correct and extend those results to higher frequencies and multipolarities. Exact results for the absorption cross-section are presented. We calculate the power radiated from a radially vibrating neutron star and find that the radiation can be hyperemissive. For example, we find for a surface radius of 1.8 Schwarzschild radii the power radiated is enhanced by as much as factor of 3.7, 4.1, 5.1, for dipole, quadrupole and octupole radiation respectively, making electromagnetic radiation a more effective damping mechanism than in flat space. The Schwarzschild radial functions are extensively treated in the appendices and numerical results are presented for various frequencies and radii. A simple asymptotic expansion for one of the connection constants, appropriate for high frequency, is also given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00643467
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