8 citations · 29 across the 9 of their papers we have counts for
7 papers · 1 filter
An Upper Bound for the Mass of Microscopic Clocks
Bruno Arderucio Costa, Yafet E. Sanchez Sanchez
According to general relativity, clocks are the basic measuring devices needed to probe spacetime geometry. However, it is generally accepted that the mass of clocks capable of mea…
Is the Page-time paradox paradoxical?
Bruno Arderucio Costa
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…
Signature of Einstein-Cartan theory
Bruno Arderucio Costa, Yuri Bonder
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 correspond…
Revisiting Claims in "Black Hole Entropy: A Closer Look"
Pedro Pessoa, Bruno Arderucio Costa, Steve Pressé
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 ori…
Can quantum mechanics breed negative masses?
Bruno Arderucio Costa, George E. A. Matsas
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 t…
Comment on "Black Hole Entropy: A Closer Look"
Pedro Pessoa, Bruno Arderucio Costa
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…
Laws of black hole thermodynamics in semiclassical gravity
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 i…