Zobrazeno 1 - 10
of 260
pro vyhledávání: '"R. N. Costa"'
In this work, we investigate the existence of wormholes within the framework of Loop Quantum Cosmology, using isotropic dark matter as the source. We analyze three distinct density profiles and solve the modified gravity field equations alongside the
Externí odkaz:
http://arxiv.org/abs/2411.12063
Autor:
Bandeira, N. S., Chaves, Andrey, de Castro, L. V., Filho, R. N. Costa, Mirzakhani, M., Peeters, F. M., da Costa, D. R.
We present a systematic study of the energy levels of twisted bilayer graphene (tBLG) quantum dots (QD) and rings (QR) under an external perpendicular magnetic field. The confinement structures are modeled by a circular dot-like- and ring-like-shaped
Externí odkaz:
http://arxiv.org/abs/2410.12014
Autor:
L. K. S. Silva, R. N. Costa, S. A. Santos, D. M. R. Silva, J. C. C. Santos, J. M. S Pavão, F. B. P. Moura, J. V. Silva
Publikováno v:
Scientific Electronic Archives, Vol 12, Iss 3, Pp 53-61 (2019)
In restoration in arid and semi-arid zones, the use of strategies to overcome water stress is fundamental to ensure the survival and establishment of seedlings. The objective of this research is to evaluate the effect of hydrogel, associated to diffe
Externí odkaz:
https://doaj.org/article/94536c9684e4453ebdea89095f6d7a04
Autor:
D. M. R. Silva, J. C. C. Santos, R. N. Costa, J. V. Santos, S. A. Santos, L. K. S. Silva, J. M. S. J. Pavão, J. V. Silva
Publikováno v:
Scientific Electronic Archives, Vol 12, Iss 1, Pp 63-70 (2019)
This study aimed to evaluate the behavior of seed, as the sensitivity of desiccation tolerance after being subjected to drying, and observe their effects on the germination of seeds of Tamboril and Mororó. It was determined the moisture content of t
Externí odkaz:
https://doaj.org/article/c2265c08e8e742b0952eb318eafb16f9
This work establishes a series of no-go conjectures that impose rigorous constraints on the localization of bulk fields in braneworld scenarios, specifically affecting gauge and spinor fields within five-dimensional spacetimes. Our approach differs f
Externí odkaz:
http://arxiv.org/abs/2405.04567
Autor:
Tong, J., Fu, Y., Domaretskiy, D., Della Pia, F., Dagar, P., Powell, L., Bahamon, D., Huang, S., Xin, B., Filho, R. N. Costa, Vega, L. F., Grigorieva, I. V., Peeters, F. M., Michaelides, A., Lozada-Hidalgo, M.
Publikováno v:
Nature 2024
The basal plane of graphene can function as a selective barrier that is permeable to protons but impermeable to all ions and gases, stimulating its use in applications such as membranes, catalysis and isotope separation. Protons can chemically adsorb
Externí odkaz:
http://arxiv.org/abs/2404.06823
We explore the conformal 5D braneworld, where warping emerges through conformal symmetry breaking. Our scenario seamlessly aligns with conventional brane approaches if conformal symmetry remains unbroken. It is shown that a model with a single confor
Externí odkaz:
http://arxiv.org/abs/2401.15243
The interplay between a magnetic field and the Coulomb potential from a charged vacancy on the electron states in graphene is investigated within the tight-binding model. The Coulomb potential removes locally Landau level degeneracy, while the vacanc
Externí odkaz:
http://arxiv.org/abs/2311.08064
This work builds upon the previous article [1] and explores the solution of the charged black string introduced in [2]. The black bounce regularization method, based on the Simpson-Visser solution, is employed by transforming the radial variable usin
Externí odkaz:
http://arxiv.org/abs/2306.03029
In this paper, we study black strings in asymptotic safety gravity (ASG) scenario. The ASG approach is introduced by implementing gravitational and cosmological running coupling constants directly in the black string metric. We calculate the Hawking
Externí odkaz:
http://arxiv.org/abs/2211.02581