**PHYSICS
SEMINAR**

### Jose
L Balduz, Jr

Physics Department

Mercer University

Wednesday,
January 22 & 29, 2003

Willet Science Center 101

**"Quantum
Strangeness Part 1: The Problem"**

and

"Quantum Strangeness Part 2: Solutions?"

**
Abstract: ** The quantum measurement problem has plagued physicists since
the 1920s, when the quantum theory was first put on a rigorous mathematical
footing. Prominent physicists like Einstein, Bohr, Heisenberg, Schroedinger,
Bohm, Wigner, Wheeler, Bell, Feynman, and Penrose all had something to say on
the matter. But perhaps the best known illustration is the (in)famous
Schroedinger's Cat Paradox, which pits a lovable kitty versus
an unstable nucleus, a vial of poison gas, and unfathomable quantum
indeterminacy...

In
__Part 1__ we introduce the problem, which appears already in the simplest of
quantum measurements: the detection of a single photon of light. We continue
with analysis of single slit and double slit experiments, the Stern-Gerlach
device, and of course Schroedinger's cat. Early explanations of the strangeness of quantum behavior are presented,
including Bohr's Copenhagen interpretation, the statistical interpretation, and
Von Neumann's chain of detectors. The problem is not solved...

In
__Part 2__ we add fuel to the fire with the EPR debate and Bell's Theorem.
Then a host of explanations for the strange quantum behavior are offered. These
range from the prosaic (decoherence), to the poetic (the conscious observer of
Wigner and Wheeler). Time permitting, we consider Everett's many worlds, the
many minds of Albert, DeBroglie-Bohm determinism, consistent histories by Omne
and Griffiths, GRW's spontaneous localization, Penrose's non-algorithmic
curvature-induced measurements, and the speaker's own contribution to the topic,
an extended deterministic version of quantum theory with multiple
observers...

*Please
join us for light refreshments outside WSC 109 at 4:15.
*

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Physics Department
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