[seminar] [DANAS] Hrvoje Nikolic, 19.5. (ponedjeljak), 14h (c.t), Predavaona I krila IRB

[Kornelija Passek-Kumericki]

                       SEMINAR  TEORIJSKE  FIZIKE


   (Zajednički seminari Fizičkog odsjeka PMF-a te Zavoda za teorijsku
    fiziku i Zavoda za eksperimentalnu fiziku IRB-a)

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Spontaneous decay, quantum Zeno effect, and black holes



Hrvoje Nikolić
  ZTF, IRB

   Datum:  ponedjeljak, 19. svibnja 2014.
   Vrijeme: 14 sati c.t.
   Mjesto: IRB, predavaona I krila


Sazetak:

Quantum spontaneous decay is a quantum jump happening at a random time,
so its description must involve a wave-function collapse.
The collapse happens due to a measurement, which is an interaction with
a macroscopic environment.  In this way the environment plays a crucial role
for the so-called "spontaneous" decay, showing that it is not really
spontaneous. In particular, if the measurement by environment is
sufficiently fast, then the decay may be slowed down by a physical
effect known as quantum Zeno effect. As a quantum effect, it works
for microscopic systems with a small number of degrees of freedom.
A macroscopic black hole, however, has some properties of a microscopic
system by having only a few classical degrees of freedom
(mass, charge and angular momentum). This makes it very susceptible
to the quantum Zeno effect, leading to a new prediction that the
actual Hawking radiation from a black hole is much weaker than predicted by
the standard analysis.


Voditeljica seminara: Kornelija Passek-Kumericki (passek at irb dot hr)
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