My Science & Epistemology Researches
Astrophysics encompasses the study of everything related to cosmic topics. We could say ‘how it works’, while Cosmology focuses on general evolutionary and interpretative aspects. This category therefore highlights insights into ‘details’.
After a hiatus from 2021, I’m resuming my online presence with this small collection of suggestions, seeking intellectual dialogue. Let me know what you think in the comments or via email.
Thanks
p.s. I posted with the dates of the original documents
My thesis work (written in italian) is published in the University of Padova archive:
Brussi 2025_Epistemology of time and cosmological interpretations
As an appendix to the same thesis I put a first development draft of the non-standard framework, which, after significant revisions, later became my work
The URD Framework.
Abstract
The aims of this study on time are first to explore its ontological meaning in the historical developments that have accompanied its interpretative evolution, and then to examine some theoretical critical issues raised by recent literature. With some original theses, some alternative explanations for the expansion of the universe are then analyzed, which the current interpretation claims to be observed experimentally, by means of a model based on the ‘specific time’ of photons as an alternative to the ‘universal time’. Furthermore, it is hypothesized a model that considers the presence of an energy density in the cosmic fluid (called aether) that interacts with the incident radiation, thus determining a redshift effect in the wavelength, or an even longer time for the same radiation to diffuse. The consistency of ‘specific time’ has been verified with Minkowski spacetime, with Einstein’s principles of special relativity, and with Friedman’s equations of cosmic dynamics. Having demonstrated the fallacy of this ‘specific time’ hypothesis, the positive conclusion is that there is no need to postulate a universal time. Once one is defined, its uniqueness or universality can be demonstrated (within the limits of the adopted models). To complement the study, possible causes of the redshift, alternative to the standard cosmological model, were analyzed. It has been taken in consideration the hypothesis that the same universe behaves like a black body, emitting a radiation (the cosmic microwave radiation) that can interact with the observed photons coming from remote sources, attenuating their energy and determining their redshift. A cross section for photons, and a model for photon-photon interactions that respects the law of conservation of energy have therefore been hypothesized. As a basis for the conjectures, direct observational evidence was considered, not interpreted by means of theories, obtaining (from the comparison with other standard candles) better distance estimates than the official ones based on Hubble’s law. This addendum is included as an Annex, believing that the same conjectures and some original models can represent a reference for future in-depth studies.
The work is written in Italian (1.8 MB):
Brussi 2025_Epistemologia del tempo e interpretazioni cosmologiche
A brief overview of Einstein’s view of the ether. As his physical interpretation of Nature evolved, so did his interpretation of the ether.
Written in Italian.
Brussi 2024_Einstein e l’etere
My introductory study of galactic dynamics, particularly on the so-called “disk heating”, with a review of the underlying theories.
Brussi 2024_An overview on disk heating
We derive the II Jeans equation (the Jeans equations are a set of partial differential equations that describe the motion of a collection of stars in a gravitational field) from the collisionless Boltzman equation (CBE) in cylindrical coordinates.
Brussi 2024_Jeans equation in cylindrical coordinates
An easy introduction for laymen on what redshift is, written in italian.
Brussi 2023_Note for laymen – Redshift
This work is a further study of Albert Einstein’s article, “Emission and Absorption of Radiation in the Quantum Theory” (Strahlungs Emission und Absorption nach der Quantentheorie). A brilliant work published in 1916.
This work of mine is written in Italian.
Brussi 2023_Einstein 1916 Emissione e assorbimento di radiazione
ABSTRACT
Albert Einstein’s study, “Emission and Absorption of Radiation According to Quantum Theory,” [Einstein, 1916], proposed an original interpretation for the probabilities of exchanges between atomic energy levels, predicting spontaneous emissions, as well as absorption and radiation-stimulated emissions, from molecules in thermodynamic equilibrium. This study made the coefficient associated with spontaneous emissions Aji, the absorption coefficient Bij, and the coefficient associated with stimulated emissions Bji famous; it also laid the theoretical foundation for the development of lasers.
In-depth analysis: a paraphrase of the conjectures in Einstein’s original publication, an in-depth analysis of the parameter associated with the coefficients called the oscillator strength (derived with different procedures for both spontaneous emission and absorption of radiation), and some examples of the use of Einstein’s coefficient Aji in astronomical spectroscopy.
An in-depth analysis of the relativistic and mathematical consequences of a modified special theory of relativity, without taking Einstein’s postulate about the constancy of the speed of light in a round trip for granted.
It’s a work developed to complement another on the epistemology of time and it’s written in italian.
Brussi 2023_Sul postulato della velocità unidirezionale della luce
This is a report developed for the Astronomy Laboratory exam. It is educational in nature and written in Italian. There are a few minor errors and some assessments based on unproven models, but I am leaving it as it is (or as it was) in case any of the details might be useful to someone.
Brussi 2021_Valutazione delle masse di NGC7217 e NGC658
A brief review of Richard Feynman’s proof of Kepler’s first law.
(Under 15,000 keystrokes were needed; this work of mine is written in Italian)
Brussi 2020_Feynman e la prima legge di Kepler
