10,774 research outputs found
Is the Dark Disc contribution to Dark Matter Signals important ?
Recent N-body simulations indicate that a thick disc of dark matter,
co-rotating with the stellar disc, forms in a galactic halo after a merger at a
redshift . The existence of such a dark disc component in the Milky Way
could affect dramatically dark matter signals in direct and indirect detection.
In this letter, we discuss the possible signal enhancement in connection with
the characteristics of the local velocity distributions. We argue that the
enhancement is rather mild, but some subtle effects may arise. In particular,
the annual modulation observed by DAMA becomes less constrained by other direct
detection experiments
Dynamical symmetries of the Klein-Gordon equation
The dynamical symmetries of the two-dimensional Klein-Gordon equations with
equal scalar and vector potentials (ESVP) are studied. The dynamical symmetries
are considered in the plane and the sphere respectively. The generators of the
SO(3) group corresponding to the Coulomb potential, and the SU(2) group
corresponding to the harmonic oscillator potential are derived. Moreover, the
generators in the sphere construct the Higgs algebra. With the help of the
Casimir operators, the energy levels of the Klein-Gordon systems are yielded
naturally.Comment: 4
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