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of 19
pro vyhledávání: '"Costa, Bruno Arderucio"'
A long-standing problem in physics is why observed masses are always positive. While energy conditions in quantum field theory can partly answer this problem, in this paper we find evidence that classical general relativity abhors negative masses, wi
Externí odkaz:
http://arxiv.org/abs/2408.00154
Autor:
Costa, Bruno Arderucio
I discuss how five reasonably sounding assumptions lead to a dilemma -- the Page-time paradox -- , which appears to challenge a conventional statistical mechanical underpinning of black hole thermodynamics. By inspecting the conceptual subtleties beh
Externí odkaz:
http://arxiv.org/abs/2402.17815
Autor:
Costa, Bruno Arderucio, Bonder, Yuri
Publikováno v:
Phys. Lett. B 849 (2024) 138431
We study the physical effects of torsion as predicted by the Einstein-Cartan theory in the test particle approximation and the non-relativist limit. We first present the corresponding non-relativistic Hamiltonian for a 2-spinor. Then, we solve an ide
Externí odkaz:
http://arxiv.org/abs/2309.11536
Publikováno v:
Annals of Physics 453 169303 (2023)
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
Externí odkaz:
http://arxiv.org/abs/2301.06600
Here we explain how C. Tsallis' reply (Entropy 2021, 23(5), 630) fails to respond to points raised in (Entropy 2020, 22(10), 1110) and introduces further inconsistencies on the origin of black hole entropy. In his reply, Tsallis argues that the exten
Externí odkaz:
http://arxiv.org/abs/2210.00324
Autor:
Costa, Bruno Arderucio
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:
Phys. Rev. D 105, 085016 (2022)
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:
http://arxiv.org/abs/2112.08881
Autor:
Costa, Bruno Arderucio, Pessoa, Pedro
Publikováno v:
Phys. Sci. Forum 2021, 3(1), 8
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
Externí odkaz:
http://arxiv.org/abs/2108.10895
Autor:
Pessoa, Pedro, Costa, Bruno Arderucio
Publikováno v:
Entropy 2020, 22(10), 1110
In a recent paper [Entropy 2020, 22(1), 17] C. Tsallis states that entropy -- as in Shannon's 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 en
Externí odkaz:
http://arxiv.org/abs/2008.13744
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