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6
March (Friday)
4:15 PM Room
224
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György Szondy*
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What is
Time? Why is General
Relativity Nonlinear?
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According
to theoretical physicists
(relativists) time (=
proper-time) is what the atomic
clock shows ... but it is also
well known that “clocks in
strong gravity tick slower than
clocks in weak gravity”. It
means that the dτ/dt depends on
the position, more precisely the
altitude of the actual clock.
Then what the Time really is?
How do we measure it? What is
the role of different time
measures?
Engineers and relativists have
different concepts of time. As a
result, satellite navigation
(GPS) computing needs are orders
of magnitude lower than General
Relativity. Still, GPS works
well, and what’s more: the two
approaches are equivalent.
Balloon Relativity is a simple
model that helps to understand
why the description of engineers
and Einstein is equivalent, and
how nonlinearity, locality, and
other properties of General
Relativity (e.g. gravitational
redshift or Shapiro time-delay)
caused by its definitions.
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*
György Szondy graduated as an
electrical engineer at BME in
1995. Since 2000 he has been
dealing with the fundamental
questions of General Relativity
and its alternatives:
scalar-tensor gravity, quantum
gravity as well as Satellite
Navigation (GPS). He has several
publications on the subject. As
an independent researcher,
together with Wigner and BME
researchers he takes part in the
high precision re-measurement of
the Eötvös equivalence principle
(EPF experiment).
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27
March (Friday) 4:15 PM
ONLINE:
Join Zoom* Meeting
https://zoom.us/j/131466440?pwd=S1FKVnIyRzg4dkQzQmZNYlBoOHVrZz09
Meeting ID: 131 466 440
Password: 014415
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Tamás Geszti
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Department of
Physics of Complex
Systems, Institute of
Physics
Eötvös
University, Budapest
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The Law
and its properties
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Laws of
Nature make up interesting
logical structures. The most
widespread kind of it is a
nested sequence of more and more
refined descriptions of the same
phenomenon, the older version
being a property of the later
one. Important examples are:
Newton’s mechanics as a property
of Schrödinger’s equation of
quantum mechanics; or electric
circuit laws as a property of
Maxwell’s equations. A currently
interesting example is the
active field of research called
Foundations of Quantum
Mechanics; there it is an open
question whether randomness and
Born’s law are parts of the law
as we use it, or properties of
some still unknown law of
nature.
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* You are supposed
to have Zoom installed. Zoom is
freely available from here:
https://zoom.us/download
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Tamás Geszti -- our first online
seminar session during the Covid-19
closing
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