My Science & Epistemology Researches
“Free thoughts by Richard Feynman -highly relatable and easy to agree with- taken from a 1981 BBC interview. From the Italian version (Adelphi Edizioni) of his book The Pleasure of Finding Out.
Feynman Il piacere di scoprire pp.40-42
A new video by Sabine Hossenfelder on simultaneity, well explained. Simultaneity is an aspect of our time that should be taken into greater consideration in all our theoretical developments in any field of knowledge. Instead, it is largely ignored.
This image of NGC 5335 was captured by the Hubble Space Telescope in 2025 to celebrate its 35th anniversary.
read more on Black Hole X Channel
The galactic bulge is indeed an incredibly dense region. While the solar neighborhood has a stellar density of roughly about 1 star every 250 cubic light-years), the central bulge reaches densities of millions of stars per cubic light-year. In the densest parts, stars can be separated by only a few light-days or light-weeks, compared to the 4+ light-years between us and Proxima Centauri.
read more on Black Hole X Channel
Looking at photographs of galaxies, one gets the impression that they are gas clouds, as they were actually considered before the resolution of optical instruments allowed us to identify individual sources. As in these splendid images from HST (the Hubble Space Telescope) and VISTA (the Visible and Infrared Survey Telescope for Astronomy, part of ESO’s Paranal Observatory).
Young compact star cluster E269-58 by HST on X Black Hole channel
Cat’s Paw Nebula in Infrared on X Black Hole channel
A very thorough article with examples of the Feynman trick for integration (differentiation under the integral sign). But even in the simplest cases it is a precious tool.
Zaharia Burghelea “Feynman’s Trick”
by HST on X Black Hole channel
NGC6537, the Red Spider Nebula, as seen by JWST
media.inaf.it “Nella tela del Ragno Rosso” (Ita)
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
