619 research outputs found
Stability issues of black hole in non-local gravity
We discuss stability issues of Schwarzschild black hole in non-local gravity.
It is shown that the stability analysis of black hole for the unitary and
renormalizable non-local gravity with cannot be performed
in the Lichnerowicz operator approach. On the other hand, for the unitary and
non-renormalizable case with , the black hole is stable against the
metric perturbations. For non-unitary and renormalizable local gravity with
(fourth-order gravity), the small black holes
are unstable against the metric perturbations. This implies that what makes the
problem difficult in stability analysis of black hole is the simultaneous
requirement of unitarity and renormalizability around the Minkowski spacetime.Comment: 1+15 pages, one figure, version to appear in Physics Letters
Investigation on the Tachyonic Neutrino
According to the experimental data, it is still controversial whether the
neutrinos, especially the electron-neutrino and muon-neutrino, can be
considered as the fermionic spinorial tachyons, and there is still no reliable
report on the existence of the right-handed neutrinos. In this letter, we show
that the neutrinos with the single handedness can not be the tachyons, but only
those of the both handedness can be. Several implications of this result are
discussed.Comment: 13 pages, latex, no figure
Topological Massive Gauge Theories in Three Dimensions Based on the Faddeev-Jackiw Formalism
We quantize the (2+1)-dimensional self-dual and Maxwell-Chern-Simons theories
by using the Faddeev-Jackiw formulation and compare the results with those of
the Dirac formalism.Comment: 13 Pages, latex, no figure
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