149 research outputs found
Charge and mass effects on the evaporation of higher-dimensional rotating black holes
To study the dynamics of discharge of a brane black hole in TeV gravity
scenarios, we obtain the approximate electromagnetic field due to the charged
black hole, by solving Maxwell's equations perturbatively on the brane. In
addition, arguments are given for brane metric corrections due to backreaction.
We couple brane scalar and brane fermion fields with non-zero mass and charge
to the background, and study the Hawking radiation process using well known low
energy approximations as well as a WKB approximation in the high energy limit.
We argue that contrary to common claims, the initial evaporation is not
dominated by fast Schwinger discharge.Comment: Published version. Minor typos corrected. 29 pages, 5 figure
Potato biodiversity: a linear discriminant analysis on the nutritional and physicochemical composition of fifty genotypes
Fifty potato genotypes from twenty-four different countries of origin, four different flesh colours (yellow, purple, red and marble) and different cultivation types (Andean accessions, landraces, breeder lines and cultivated varieties) were studied in terms of their nutritional and physicochemical characteristics. In general, cultivated varieties and breeder lines showed the highest similarity (slight differences only in some particular fatty acids distributions: C10:0, C12:0 and C22:0) concerning the physicochemical parameters assayed in this work, independently of the geographical origin or tuber flesh colour of these genotypes. Nonetheless, some of the studied landraces and Andean accessions proved to be similar enough to be considered as genotypes with good potential for commercial cultivation. These results can contribute to the supply of new potato genotypes into sustainable farming systems, supporting the protection of potato biodiversity, particularly Andean accessions, landraces and coloured genotypes (red or purple flesh) which are not widely cultivated so far.S. Sampaio acknowledges CAPES Foundation (Ministry of Education,
Brazil) for her PhD grant no. 99999.001423/2015-00. The authors are
grateful to the Foundation for Science and Technology (FCT, Portugal)
for financial support through national funds FCT/MCTES to CIMO
(UIDB/00690/2020); the national funding by FCT, P.I., through the
institutional scientific employment program-contract for L. Barros contract.
GIP-USAL is financially supported by the Spanish Government
through the project AGL2015-64522-C2-2-R.info:eu-repo/semantics/publishedVersio
On (non-Hermitian) Lagrangeans in (particle) physics and their dynamical generation
On the basis of a new method to derive the effective action the
nonperturbative concept of "dynamical generation" is explained. A non-trivial,
non-Hermitian and PT-symmetric solution for Wightman's scalar field theory in
four dimensions is dynamically generated, rehabilitating Symanzik's precarious
phi**4-theory with a negative quartic coupling constant as a candidate for an
asymptotically free theory of strong interactions. Finally it is shown making
use of dynamically generation that a Symanzik-like field theory with scalar
confinement for the theory of strong interactions can be even suggested by
experiment.Comment: 12 pages, no figures, accepted for publication in Czech.J.Phys.,
revised with respect to obvious typo
Black Hole Remnants at the LHC
We investigate possible signatures of black hole events at the LHC in the
hypothesis that such objects will not evaporate completely, but leave a stable
remnant. For the purpose of defining a reference scenario, we have employed the
publicly available Monte Carlo generator CHARYBDIS2, in which the remnant's
behavior is mostly determined by kinematic constraints and conservation of some
quantum numbers, such as the baryon charge. Our findings show that electrically
neutral remnants are highly favored and a significantly larger amount of
missing transverse momentum is to be expected with respect to the case of
complete decay.Comment: LaTeX, 13 pages, 2 tables, 5 figures, references added and typos
corrected. To appear in EPJ
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