arXiv subjects

Samuel Bueno Soltau

Publications and source records attributed to Samuel Bueno Soltau.

3 recordsLinked to original sources

arXiv2025

Black Hole Thermodynamics: Established Results, Unresolved Paradoxes, and Speculative Resolutions

Between 1972 and 1975, Jacob Bekenstein proposed that black holes possess entropy proportional to their horizon area, and Stephen Hawking derived this relationship from semiclassical quantum field theory in curved spacetime, predicting thermal radiation from black holes. These developments established black hole thermodynamics as a formal framework connecting general relativity, quantum mechanics, and statistical physics. However, this synthesis rests on approximations whose validity remains unproven in regimes where quantum gravitational effects become important. This article provides a detailed overview of the historical development from 1972 to 1975 and surveys modern proposals, such as the holographic principle and gravitational path integrals. We highlight persistent theoretical challenges, including the information paradox, the trans-Planckian problem, backreaction effects, and the absence of experimental verification. The work concludes by identifying which aspects of black hole thermodynamics are well-established and which remain speculative or fundamentally incomplete.

gr-qc↗

arXiv2025

The Covariant Relativistic Derivation of De Broglie Relation

This paper provides an examination of the de Broglie relation, tracing its historical development from the quantum hypotheses proposed by Planck and Einstein to its covariant relativistic derivation. The discussion begins by situating de Broglie's seminal insight within the early framework of quantum theory. We then reconstruct his original heuristic derivation. The primary focus of this work, however, is the derivation of the de Broglie relation directly from the principles of special relativity, employing the four-momentum formalism. A comparative analysis between the heuristic and relativistic approaches underscores the universality and conceptual coherence of the latter. The paper concludes by highlighting the significance of relativistic mechanics in establishing a consistent foundation for wave-particle duality, further reinforcing this through a quantum field theoretical perspective.

quant-ph↗

arXiv2024

The Unified Era: An understanding journey from observations to the Unified Model of Active Galactic Nuclei

The Unified Model of Active Galactic Nuclei (UMAGN) is a comprehensive theoretical framework aimed at elucidating the diverse observations of AGN, encompassing quasars and Seyfert galaxies. The Model attributes the observed variations to different orientations of a surrounding matter disk around a supermassive black hole (SMBH), with the primary factor influencing observational diversity being the alignment of the AGN with the observer's line of sight. We present a comprehensive overview of the observational evidence, empirical and theoretical research, tracing key milestones that led to a unified perspective. We encapsulate the scientific journey culminating in the proposal of the UMAGN, including insights into the accretion disk, torus, and relativistic jet, and emphasize the properties of objects within UMAGN. Additionally, we underscore recent progress in multimessenger research involving electromagnetic waves, gravitational waves, astroparticles, and neutrinos, notably through collaborations such as the Event Horizon Telescope, LIGO/Virgo, IceCube, Pierre Auger, and KM3Net. We argue that these advancements present opportunities to enhance and refine UMAGN, contributing to a deeper understanding of AGNs and their implications for the formation and evolution of galaxies. The convergence of observational and theoretical research, coupled with emerging multimessenger techniques, paves the way for further strides in comprehending these enigmatic cosmic phenomena.

astro-ph.GA↗