Mathematisches Oberseminar: Quantenmechanische Vielteilchensysteme und relativistische Quantentheorie
In the summer term 2020 from
Dr. Dirk Deckert,
Prof. Dr. Detlef Dürr
and
Prof. Dr. Peter Pickl
The seminar is usually on Wednesdays, 16:15h, starting on the 22th of April and will take place on Zoom. Please contact us for the session link if you are interested to join.
Organizer: Manuela Feistl
News:
Updates may be distributed on short notice by mail to all people on an internal list. People interested in should contact
Dr. Dirk Deckert,
Prof. Dr. Detlef Dürr
or
Prof. Dr. Peter Pickl.
Talks
Date |
Room |
Title |
Speaker |
Wed 22.04.20, 16:15 |
B004 |
Heisenberg Uncertainty Principle
|
Serj Aristarhov
|
Wed 29.04.20, 16:15 |
B004 |
Vlasov for short-range potentials
|
Manuela Feistl
|
Wed 06.05.20, 16:15 |
B004 |
Quantum measurements of time
We propose a time-of-arrival operator in quantum mechanics
by conditioning on a quantum clock. This allows us to bypass some of
the problems of previous proposals, and to obtain a Hermitian time of
arrival operator whose probability distribution arises from the Born
rule and which has a clear physical interpretation. The same procedure
can be employed to measure the "time at which some event happens" for
arbitrary events (and not just specifically for the arrival time of a
particle).
|
Lorenzo Maccone
|
Wed 13.05.20, 16:15 |
B004 |
Through the Big Bang of the Newtonian Universe
I show that the three-particle E = P = L = 0 Newtonian universe can be evolved through the points of triple collision – the Big Bang of the three-particle E = P = L = 0 Newtonian universe. The result is essentially based on a description of the system’s dynamics on shape phase space, the relational phase space of the system. Explicitly, I show that the shape, i.e. angular, degrees of freedom can be evolved uniquely through the points of total collision. This holds
for almost all collision solutions. One such solution on shape phase space corresponds to two solutions on absolute phase space, one which ends at and one which begins at a total collision, ‘glued together’ via the unique evolution of the shape degrees of freedom. That way, the Newtonian singularity is passed. Eventually, I sketch the eternal evolution of a three-particle E = P = L = 0 Newtonian universe with a Big Bang: there is a triple collision, i.e. a Big
Bang, at the mid-point of that evolution while the particles separate, typically into a Kepler pair and a single particle, and fly off in both time directions away from that point.
|
Dr. Paula Reichert
|
Wed 20.05.20, 16:15 |
B004 |
Arrival time POVMs from absorbing boundary conditions
|
Siddhant Das
|
Wed 27.05.20, 16:15 |
B004 |
Quasi-Particles
|
Umut
|
Wed 03.06.20, 16:15 |
B004 |
Geometric construction of the phase of QED
|
Markus Nöth
|
Wed 10.06.20, 16:15 |
B004 |
Momentum measurement in QM
|
Felix Feist
|
Wed 17.06.20, 16:15 |
B004 |
The sound of collapse
In some collapse models, like the Ghirardi-Rimini-Weber model, there are real objective quantum jumps. These spontaneous jumps have empirical consequences, making such models deviate from quantum mechanics. I will argue that the predictions of collapse models in general are not specific enough to deviate from quantum mechanics taken as a general approach, but only from its instantiation in the Standard Model. I will discuss one example I find particularly
surprising: a collapse model in which the jumps are so violent that they can be heard. It seems that in this context, one can know for sure that there are genuine stochastic jumps, at odds with the sort of general indistinguishably I seem to claim exists in general. But it's not the case. And I think understanding what goes on is a good way to grasp much better the role played (and not played) by decoherence in the resolution of the measurement problem.
|
Dr. Antoine Tilloy
|
Wed 24.06.20, 16:15 |
B004 |
A functional central limit theorem for a dynamical system
|
Anne Frömel
|
Wed 01.07.20, 16:15 |
B004 |
tba
|
Dr. Jonas Lampart
|
Wed 08.07.20, 16:15 |
B004 |
|
|
Wed 15.07.20, 16:15 |
B004 |
Shapespace
|
Sahand Tokasi
|