Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Bruno Arderucio Costa"'
Autor:
Bruno Arderucio Costa, Yuri Bonder
Publikováno v:
Physics Letters B, Vol 849, Iss , Pp 138431- (2024)
We study the effects of torsion as predicted by the Einstein-Cartan theory in the test-particle non-relativist approximation. We derive the corresponding 2-spinor Hamiltonian. Then, we solve an idealized reflection and transmission problem for a beam
Externí odkaz:
https://doaj.org/article/ebf02477adc54bdf8b3a08ab770e9455
Autor:
Pedro Pessoa, Bruno Arderucio Costa
Publikováno v:
Entropy, Vol 22, Iss 10, p 1110 (2020)
In a recent paper (Entropy 2020, 22(1), 17), Tsallis states that entropy—as in Shannon or Kullback–Leiber’s definitions—is inadequate to interpret black hole entropy and suggests that a new non-additive functional should take the role of entr
Externí odkaz:
https://doaj.org/article/6d920fa96b9a4288bfd28f8adedccf88
Autor:
Bruno Arderucio Costa
Publikováno v:
Biblioteca Digital de Teses e Dissertações da USPUniversidade de São PauloUSP.
Vários sistemas físicos podem ser tratados como problemas de espalhamento e, para esses problemas, uma quantidade observada surge naturalmente: a razão entre as intencidades reetidas e incidentes, a que damos o nome de coeciente de reexão. Essa d
Publikováno v:
Annals of Physics. 453:169303
Several approaches to quantum gravity suggest violations of Lorentz symmetry as low-energy signatures. This article uses a concrete Lorentz-violating quantum field theory to study different inertial vacua. We show that they are unitarily inequivalent
The Casimir effect realizes the existence of static negative energy densities in quantum field theory. We establish physically reasonable conditions for the non-negativity of the total mass of a Casimir apparatus held in equilibrium in the Minkowski
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::37de841c13c1b3b1dece20f69c00b340
http://arxiv.org/abs/2112.08881
http://arxiv.org/abs/2112.08881
Autor:
Pedro Pessoa, Bruno Arderucio Costa
Publikováno v:
The 40th International Workshop on Bayesian Inference and Maximum Entropy Methods in Science and Engineering.
Motivated by applications of statistical mechanics in which the system of interest is spatially unconfined, we present an exact solution to the maximum entropy problem for assigning a stationary probability distribution on the phase space of an uncon
Autor:
Bruno Arderucio Costa
The first and second laws of black hole thermodynamics are verified to emerge from a generic semiclassical theory of gravity for which a Hamiltonian can be defined. The first law is established for stationary spacetimes, and the second law is establi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0d2971d621a0dffc7470e63d87d28edc
We present a simple model for stellar collapse and evaluate the quantum mechanical stress-energy tensor to argue that quantum effects do not play an important role for the collapse of astrophysical objects.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2113d93d974bf731f0562add5123282e
http://arxiv.org/abs/1709.00115
http://arxiv.org/abs/1709.00115
Autor:
Bruno Arderucio Costa
Publikováno v:
Biblioteca Digital de Teses e Dissertações da USP
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
Vários sistemas físicos podem ser tratados como problemas de espalhamento e, para esses problemas, uma quantidade observada surge naturalmente: a razão entre as intencidades reetidas e incidentes, a que damos o nome de coeciente de reexão. Essa d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c1c639f74da546e9d8c5f2fc04488127