|
|
|
|
| 7
October (Wednesday)
5:00 PM
Room 226 |
| György
Darvas |
Symmetrion,
Budapest
|
| |
| Isotopic
field-charges
in the
physical
world-view |
| Can identical
(properties) be equivalent? First,
I will illustrate the difference
between equivalence and identity
on the example of non-identity of
the gravitational and inertial
masses. I will extend this
difference to the sources
(field-charges) of other physical
fields, e.g., to Coulomb- and
Lorentz-charges, etc. Thus, the
isotopic field-charges will be
defined. We will investigate,
whether field-charges (sources)
are identical in the scalar and
vector potentials of a field. I
attempt to justify the difference
by a short retrospection to the
description of the quantum theory
of the electron (1928-), referring
to the two "classical" ways of the
quantum electrodynamic model, and
to less classical ones. I
mistrust, how much relativistic
was "classical" QED. As a
consequence, we define an isotopic
field-charge model. This idea
leads to the necessity of
conservation of a quantity, called
"isotopic field-charge spin". (The
contexture includes quantities,
transformations into each other,
violation of symmetries and their
restoration by the way of another
invariance, their group, and
predicting a family of mediating
bosons.) The final three
questions: (a) how does the
isotopic field-charge model extend
the physical world-picture of the
Standard Model that seemed to be
closed for long; (b) up to what
extent does it preserve and among
what conditions does it extend the
SM; as well (c) what is its
relation to the supersymmetric
model. Do the answers given to
these questions fit in the frame
of an alternative physical picture
of the world, and how can they be
proven? |
| 14
October
(Wednesday) 5:00
PM Room 226 |
| Judit
X. Madarász |
| Alfréd
Rényi Institute of
Mathematics, Budapest |
| |
|
Principle of
Relativity,
Isotropy and Homogeneity
|
In firs order
logic framework, we formalize
Special Principle of
Relativity, isotropy and
homogeneity of space-time in
several ways and we
investigate their
interrelationships.
|
| 21
October
(Wednesday) 5:00
PM Room 226 |
Ákos
Gyarmathy & Péter
Neuman
|
Department of Philosophy
and History of Science
Budapest University of
Technology and Economics |
| |
|
Effective
causality: the
emergence of causal
anomalies in
effective theories
|
One
interesting type of causal
anomalies is the precedence of
causes by their effects. These
anomalies are often attributed to
quantum physics where the formal
systems of these theories
sometimes entail an inverse
sequence of the causal relata.
There are at least 4 popular
strategies for eliminating these
anomalies. The first is to revise
our everyday notion of causation
and claim that the original
sequence of cause and effect is
sometimes reversed (backward
causation). The defender of this
strategy needs to provide
solutions for the bootstrap and
the consistency paradoxes. A
similar strategy is to claim that
causation does not require time
(Baron and Miller 2014),
therefore, concerning causation,
the temporal order of the causal
relata does not make any
difference. This solution would be
in accordance with physical
theories since eliminating the
time arrow problem would bypass
the classical Russellian (1913)
argument for the claim that
causation is not part of physics.
As an alternative to these
revisionist strategies one could
claim that temporal order is a
necessary feature of causation and
this is why causation is not part
of physical theories therefore
cause and effect do not make sense
in physics. Since this way, causal
relata do not make sense in
physics neither can their
sequential order be represented in
physical theories therefore the
declaration of anomalies of their
inverse order must be a conceptual
mistake in physical theories.
Consequently physical theories
should not affect our notion of
causation because they do not
represent causal relata. A further
way to clarify the problem of the
inverse sequence of causal relata
is to show that in certain
theoretical contexts these
anomalies emerge as peculiarities
of the given theory’s methodology.
We argue that this is the case in
effective theories. Green’s
function technology, extensively
used to solve linear differential
equations seems to have a crucial
role in determining the causal
structure of such theories. For
the sake of conceptual clarity we
apply the notion of acausality
(following Polonyi) to cases where
interactions are induced both
forward and backward in time
therefore no definite system time
arrow is observed. Apparently the
definition of Polonyi’s notion of
acausality is wider than its use
in philosophy because he refers to
a notion of causality that is
created by Wigner and is widely
used to define causation in
physics. Acausality in Polonyi’s
sense includes both cases where
time arrow disappears and when
causal relata take reverse order.
In philosophical discussions it is
usually the former meaning that
they attach to the notion of
acausality while the latter is
called backward causation. We will
use these notions in their
philosophical sense but Polonyi
does not make this distinction.
|
|
|
|
