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
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
In this paper, we investigate the spinless stationary Schr\"odinger equation for the electron when it is permanently bound to a generalized Ellis-Bronnikov graphene wormhole-like surface. The curvature gives rise to a geometric potential affecting th
Externí odkaz:
http://arxiv.org/abs/2208.06869
In this paper we find an universal mass scale for all $p-$forms in multi-brane worlds model. It is a known fact the this model provides an ultralight mode for the fields. However, to get this, the Lagrangians considered in the literature are not cova
Externí odkaz:
http://arxiv.org/abs/2105.07500