640 research outputs found
Domain wall brane in a reduced Born-Infeld- theory
The Born-Infeld theory is reduced from the Born-Infeld determinantal
gravity in Weitzenb\"ock spacetime. We investigate a braneworld scenario in
this theory and obtain an analytic domain wall solution by utilizing the
first-order formalism. The model is stable against the linear tensor
perturbation. It is shown that the massless graviton is localized on the brane,
but the continuous massive gravitons are non-localized and will generate a tiny
correction with the behavior of to the Newtonian potential.
The four-dimensional teleparallel gravity is recovered as an effective infrared
theory on the brane. As a physical application, we consider the
(quasi-)localization property of spin-1/2 Dirac fermion in this model.Comment: 9 pages, 2 figures, published versio
Hints of a universal width-energy relation for classified fast radio bursts
The total available sample of fast radio bursts (FRBs) has been growing
steadily in recent years, facilitating the study of FRBs from a statistical
point of view. At the same time, the classification of FRBs is currently an
imperative issue. We propose that the brightness temperature of bursts can
serve as an ideal criterion for classification. In this work, we gather the
available data for all localized FRBs and we find a positive relation between
the intrinsic pulse width and burst energy, ,
for three repeating FRBs that is similar to that of our previous work using FRB
20121102A data alone. The critical line is found to vary for
different FRBs, which may reflect the differences in source properties. This
relation can put strong constraints on mainstream radiation mechanisms. It is
evident that neither the coherent curvature radiation or synchrotron maser
radiation have the capability to reach the high brightness temperature required
to reproduce this relation.Comment: 6 pages, 5 figure
- …