Results 31 to 40 of about 16,616 (276)
Quasinormal frequencies for a black hole in a bumblebee gravity [PDF]
Europhysics letters, 2021 After recent observational events like the LIGO-Virgo detections of gravitational waves and the shadow image of the M87* supermassive black hole by event horizon telescope (EHT), the theoretical study of black holes was significantly improved. Quantities
R. Oliveira, D. M. Dantas, C. Almeida
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Basic and Applied Ecology, 2022 Many bumblebee species are declining due to a loss of semi-natural habitats in agricultural landscapes resulting in diminished forage and nest sites. Anecdotal experience indicates that bumblebees nest in straw bales, but scientific evidence is lacking ...
Sandra A.M. Lindström +2 more
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Constraining the Lorentz-violating bumblebee vector field with big bang nucleosynthesis and gravitational baryogenesis [PDF]
The European Physical Journal C, 2022 By assuming the cosmological principle i.e., an isotropic and homogeneous universe, we consider the cosmology of a vector-tensor theory of gravitation known as the bumblebee model.
Mohsen Khodadi, G. Lambiase, A. Sheykhi
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Ecology and Evolution, 2020 Bumblebee populations are declining. Factors that impact the size and success of colonies act by either limiting resource availability (bottom‐up regulation) or causing mortality, for example, pesticides, disease, and possibly predation (top‐down ...
Bethany R. Roberts +2 more
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Braneworlds in bumblebee gravity
Nuclear Physics B, 2023 We investigate thick-brane solutions within the five-dimensional bumblebee gravity in the presence of a real scalar field. Specifically, we implement the Lorentz symmetry breaking scenario within this context and obtain brane-like structures.
M.A. Marques +3 more
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Interspecific Variation in Bumblebee Performance on Pollen Diet: New Insights for Mitigation Strategies. [PDF]
PLoS ONE, 2016 Bumblebees (i.e. Bombus genus) are major pollinators of flowering wild plants and crops. Although many species are currently in decline, a number of them remain stable or are even expanding.
Romain Moerman +4 more
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Metric-affine bumblebee gravity: classical aspects
European Physical Journal C: Particles and Fields, 2021 We consider the metric-affine formulation of bumblebee gravity, derive the field equations, and show that the connection can be written as Levi-Civita of a disformally related metric in which the bumblebee field determines the disformal part.
Adrià Delhom +4 more
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An exact stationary axisymmetric vacuum solution within a metric-affine bumblebee gravity [PDF]
Journal of Cosmology and Astroparticle PhysicsWithin the framework of the spontaneous Lorentz symmetry breaking (LSB), we consider a metric-affine generalization of the gravitational sector of the Standard Model Extension (SME), including the Lorentz-violating (LV) coefficients u and sμν .
A. A. Araújo Filho +3 more
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Charged spherically symmetric and slowly rotating charged black hole solutions in bumblebee gravity [PDF]
The European Physical Journal CIn this paper, we study the scenario in which the matter field is an electromagnetic field nonminimally coupled to the bumblebee vector field. We present exact charged spherically symmetric black hole solutions and slowly rotating charged solutions in ...
Jia-Zhou Liu +3 more
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Black holes with a cosmological constant in bumblebee gravity [PDF]
, 2020 In this work, we present black hole solutions with a cosmological constant in the bumblebee gravity, which provides a mechanism for the Lorentz symmetry violation by assuming a nonzero vacuum expectation value for the bumblebee field.
R. V. Maluf, J. Neves
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