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We introduce normal coordinates on the infinite dimensional group G introduced by Connes and Kreimer in their analysis of the Hopf algebra of rooted trees. We study the primitive elements of theâ€¦ (More)

- Robert M. Kessler, Hernando Quevedo, +4 authors Kenneth M. Kessler
- AJR. American journal of roentgenology
- 1993

OBJECTIVE
The resistive index in cortical or arcuate renal arteries of children was calculated to determine whether obstructive uropathy could be differentiated from nonobstructive dilatation.
â€¦ (More)

- Hernando Quevedo
- 2008

We apply the formalism of geometrothermodynamics to the case of black holes with cosmological constant in four and higher dimensions. We use a thermodynamic metric which is invariant with respect toâ€¦ (More)

We analyze different types of quantum corrections to the Cardy-Verlinde entropy formula in a Friedmann-Robertson-Walker universe and in an (anti)de Sitter space. In all cases we show that quantumâ€¦ (More)

A non-perturbative canonical quantization of Gowdy T 3 polarized models carried out recently is considered. This approach profits from the equivalence between the symmetry reduced model and 2+1â€¦ (More)

- Alfredo MaÄ‡Ä±as, Hernando Quevedo

The aim of this work is to review the concepts of time in quantum mechanics and general relativity to show their incompatibility. We show that the absolute character of Newtonian time is present inâ€¦ (More)

- Eloy AyÃ³n â€“ Beato, Alberto GarÄ‡Ä±a, Alfredo MaÄ‡Ä±as, Hernando Quevedo
- 2001

We investigate spherically symmetric and static gravitational fields representing black hole configurations in the framework of metricâ€“affine gauge theories of gravity (MAG) in the presence ofâ€¦ (More)

- Francisco Frutos-Alfaro, Hernando Quevedo, Pedro A SÃ¡nchez
- Royal Society open science
- 2018

We investigate the properties of static and axisymmetric vacuum solutions of Einstein equations which generalize the Schwarzschild spherically symmetric solution to include a quadrupole parameter. Weâ€¦ (More)

We examine the consistency of the thermodynamics of irrotational and non-isentropic perfect fluids complying with matter conservation by looking at the integrability conditions of the Gibbs-Duhemâ€¦ (More)

It is generally known that linear (free) field theories are one of the few QFT that are exactly soluble. There are, however, (at least) two very different languages to describe them, Fock spaceâ€¦ (More)