Mathematics meets Physics
Advanced School
17 – 21 February
2020
UNICAMP, Campinas, Brazil
updated 11/Dec/2019
Get prepared for the physics --
2 videos by André Assis
Get an idea upfront of what to expect in our physics talk.
Here is an Email from André Assis providing description of and links
to recent talks of him.
Dear Colleague,
I am writing to send the links of 2 talks, one on Weber’s
Electrodynamics and the other on Relational Mechanics.
I am also sending the links of the slides of these presentations
and their abstracts.
They were presented in Prague, Czech Republic, on October 18 and
19, 2019, at the Conference Physics Beyond Relativity.
I would appreciate if you could send this information to your
interested colleagues and students.
Talk on Weber’s Electrodynamics and His Planetary Model of the
Atom (1 hour):
https://science21.cz/conference/?p=810
Slides of this presentation:
http://www.ifi.unicamp.br/~assis/Weber-Electrodynamics-18-10-2019.pdf
Abstract: We present the origins of Wilhelm Weber’s
electrodynamics (1846).
Weber’s force depends not only on the distance between the
interacting charges but also on their relative velocity
and relative acceleration. We discuss Ampère’s force between
current elements and compare it with Grassmann-Biot-Savart’s
law.
We also compare Lorentz’s force with Weber’s force. We discuss
Weber’s planetary model of the atom.
It was developed before Rutherford’s experiments and Bohr’s model.
In Weber’s planetary model,
the positive nucleus is stabilized (or held together) by
purely electrodynamic forces.
According to Weber, when two positive charges are very close to one
another,
they behave as if they had an effective negative inertial
mass, attracting one another instead of repelling each other.
We also present modern experiments and theoretical
developments related to Weber’s electrodynamics.
My next project is to publish an English translation of Weber’s
main works on electrodynamics.
I am looking for volunteers who might help translating any of
Weber’s papers.
Talk on Relational Mechanics (1 hour):
https://science21.cz/conference/?p=878
Slides of this presentation:
http://www.ifi.unicamp.br/~assis/Relational-Mechanics-19-10-2019.pdf
Abstract: We present Galileo's free fall experiment and
its interpretation in Newtonian mechanics.
We also discuss Newton's bucket experiment. In this case we have
a bucket partially filled with water hanging by a rope.
When the bucket and the water are at rest relative to the ground,
the surface of the water is flat.
When the bucket and the water rotate together relative to the
ground, the surface of the water becomes concave
(the water rises towards the sides of the bucket, acquiring a
parabolic shape).
In Newtonian mechanics the curvature of the water surface is not
due to its rotation relative to the bucket,
relative to the Earth, nor relative to the distant stars and
galaxies.
According to Newton, this experiment proved the existence of empty
and free space, which he called absolute space.
According to him, the curvature of the water was due to its
rotation relative to absolute space.
We then discuss the criticisms of Ernst Mach against Newtonian
mechanics.
An emphasis is given to Mach's ideas according to which the inertia
of any body is due to its
gravitational interaction with the distant masses in the universe.
Einstein's theories of relativity do not implement Mach's principle.
This fact is one of the reasons why we are totally against
Einstein’s special and general theories of relativity.
Finally, we present Relational Mechanics, a theory which
implements quantitatively Mach's ideas about the
origin of inertia utilizing Weber's law for gravitation. We
discuss Galileo's free fall experiment and
Newton's bucket experiment from the point of view of Relational
Mechanics.
We also present experimental tests in order to distinguish
Relational Mechanics from Einstein’s general theory of
relativity.
Yours, André Assis
O conteúdo desta página
representa a opinião e pontos de vista individuais do autor. O
conteúdo dos 'links' representam a opinião e pontos de vista
individuais dos autores dos links e não necessariamente aqueles
do autor do site presente. Contato: As letras '', '', e '' em
frente de arroba
Atualização: 9.11.1984