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**Time: ** 26. December 2007, 11:00h

**Place: ** Institute of Physics, room 300

**Speaker: ** Nemanja Kaloper

**Title: ** Cosmological Constant and Other Dark Thoughts

**Abstract:**

We review the cosmological constant problem with particular attention to its gravitational aspects, and give a critical survey of the attempts to explain cosmic acceleration to date.

**Time: ** 16. November 2007, 11:00h

**Place: ** Institute of Physics, room 300

**Speaker: ** Marko Vojinović

**Title: ** Particle motion in spaces with curvature and torsion

**Abstract:**

We examine particle motion in Riemann-Cartan spacetime assuming that it has nonzero orbital angular momentum and/or spin. The most interesting result is for the case of Dirac particle, which does not couple to curvature but only to torsion, in single-pole approximation. We compare this result with previous known results and discuss the difference.

**Time: ** 03. August 2007, 11:00h

**Place: ** Institute of Physics, room 300

**Speaker: ** Tatjana Vukašinac

**Title: ** Polymer quantum mechanics and its continuum limit

**Abstract:**

Polymer quantum mechanics was recently introduced in the context of loop quantum gravity. We analize basic properties of this representation of quantum mechanics and its relation with the standard Schroedinger representation. We construct the dynamics as the appropriate continuum limit of effective theories, defined at different scales. As a result, we obtain the physical Hilbert space in which the continuum Hamiltonian can be represented, and this representation is unitarily equivalent to the Schroedinger representation.

**Time: ** 22. June 2007, 11:00h

**Place: ** Institute of Physics, room 300

**Speaker: ** Marko Vojinović

**Title: ** Noncommutative Geometry via A. Sitarz

**Abstract:**

We give a short review of the course on Noncommutative Geometry held by A. Sitarz at the Advanced Summer School on Integrable Systems and Quantum Symmetries (Prague, June 8 - 13, 2007), with the emphasis on the alternative approach to the subject by mathematicians as opposed to physicists. We quote some basic and interesting results skipping the most of the big (6 lectures long) exposition.

**Time: ** 18. June 2007, 12:00h

**Place: ** Institute of Physics, room 300

**Speaker: ** Milorad Popović

**Title: ** Near Future of Fermilab and Neutrino Physics

**Abstract:**

In the following, we describe a vision for the long-term national/international high energy physics program that takes the U.S. back to the energy frontier. The vision is muon-based, ultimately leading to a multi-TeV muon collider.

**Time: ** 08. June 2007, 11:00h

**Place: ** Institute of Physics, room 300

**Speaker: ** Voja Radovanović

**Title: ** Deformed SUSY space (part II)

**Abstract:**

**Time: ** 01. June 2007, 11:00h

**Place: ** Institute of Physics, room 300

**Speaker: ** Voja Radovanović

**Title: ** Deformed SUSY space (part I)

**Abstract:**

**Time: ** 23. March 2007, 11:00h

**Place: ** Institute of Physics, room 300

**Speaker: ** Branislav Cvetković

**Title: ** Supersymmetric 3D Gravity with Torsion: Asymptotic Symmetries

**Abstract:**

We study the structure of asymptotic symmetries in N=1+1 supersymmetric extension of three-dimensional gravity with torsion. Using a natural generalization of the bosonic anti-de Sitter asymptotic conditions, we show that the asymptotic Poisson bracket algebra of the canonical generators has the form of two independent super-Virasoro algebras with different central charges.

**Time: ** 09. March 2007, 11:00h

**Place: ** Institute of Physics, room 300

**Speaker: ** Marko Vojinović

**Title: ** Interaction of String with the Particle

**Abstract:**

Within the framework of generalized Papapetrou method, we derive the effective equations of motion for a string with two particles attached at the ends, along with appropriate boundary conditions. The equations of motion are the usual Nambu-Goto-like equations, while boundary conditions turn out to be equations of motion for the particles at the string ends. The form of those equations is discussed, with the emphasis on the force that the string exerts on the particle. It turns out that this force has some formal similarity with the Lorentz force law of electrodynamics.

**Seminars for the year:**
2021
2020
2019
2018
2017
2016
2015
2014
2013
2012
2011
2010
2009
2008
2007

**Follow our seminars online via:** GPF BigBlueButton server