795 research outputs found
Thermal analysis of photon-like particles in rainbow gravity
This work is devoted to study the thermodynamic behavior of photon--like
particles within the \textit{rainbow} gravity formalism. To to do this, we
chose two particular ansatzs to accomplish our calculations. First, we consider
a dispersion relation which avoids UV divergences, getting a positive effective
cosmological constant. We provide \textit{numerical} analysis for the
thermodynamic functions of the system and bounds are estimated. Furthermore, a
phase transition is also expected for this model. Second, we consider a
dispersion relation employed in the context of \textit{Gamma Ray Bursts}.
Remarkably, for this latter case, the thermodynamic properties are calculated
in an \textit{analytical} manner and they turn out to depend on the harmonic
series , gamma , polygamma and zeta Riemann
functions .Comment: 22 pages, 7 figure
Gravitational traces of bumblebee gravity in metric-affine formalism
This work explores various manifestations of bumblebee gravity within the
metric--affine formalism. We investigate the impact of Lorentz violation
parameter, denoted as , on the modification of the \textit{Hawking}
temperature. Our calculations reveal that as increases, the values of the
\textit{Hawking} temperature attenuate. To examine the behavior of massless
scalar perturbations, specifically the \textit{quasinormal} modes, we employ
the WKB method. The transmission and reflection coefficients are determined
through our calculations. The outcomes indicate that a stronger
Lorentz--violating parameter results in slower damping oscillations of
gravitational waves. To comprehend the influence of the \textit{quasinormal}
spectrum on time--dependent scattering phenomena, we present a detailed
analysis of scalar perturbations in the time--domain solution. Additionally, we
conduct an investigation on shadows, revealing that larger values of
correspond to larger shadow radii. Lastly, we explore the concept of time delay
within this framework.Comment: 29 pages and 7 figure
Efeitos de doses de nitrogênio e potássio aplicados via fertirrigação em feijão vagem (Phaseolus vulgaris L.).
Diagnóstico agroambiental do Município de Jatobá, Estado de Pernambuco.
bitstream/CNPS/11863/1/circtec20_2003_jatoba.pd
Avaliação de extratos de plantas sobre a biologia de Spodoptera frugiperda (J. F. Smith, 1797).
INTERACTIONS BETWEEN THE HERBACEOUS AND SHRUBBY-ARBOREAL COMPONENTS IN A SEMIARID REGION IN THE NORTHEAST OF BRAZIL: COMPETITION OR FACILITATION?
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