Past Events
QG group meeting: Expansions of the Black Hole Solution in AdS(3)
2018-10-01QG Group Meeting
Title: Expansions of the Black Hole Solution in AdS(3)
Speaker: Nico Fischer, Research Intern, Quantum Gravity Unit (Neiman)
Journal club seminar: Black hole memory effect
2018-09-27Discussion on Black Hole Memory Effect by Tomonori Ugajin.
Journal club seminar: Wormholes
2018-09-21Discussion on Wormholes and Extra Dimensions by Vyacheslav Lysov.
QG group meeting: Fluid/gravity correspondence
2018-09-10This is the weekly QG group meeting.
Speaker: Vyacheslav Lysov
Title: Fluid/Gravity Correspondence
Journal club seminar: Geometry of Complexity
2018-09-07Discussion by Vyacheslav Lysov on Geometry of Complexity.
QG group meeting: null hypersurface geometry
2018-09-03QG group meeting
Speaker: Yasha Neiman
Title: Introduction to the geometry of null hypersurfaces
[Seminar] "TOPOLOGICAL DEFECTS, DEFORMED LATTICES AND SPONTANEOUS SYMMETRY BREAKING" by Dr. Vincenzo Vitagliano
2018-08-28Speaker: Dr. Vincnezo Vitagliano from Keio University
Abstract:
External conditions have a dramatic impact on the way dynamical symmetry breaking occurs. I will review some recent (and some less recent) results of symmetry breaking in curved spacetime. Flirting with the contemporary interest toward 2D engineered material, I will then move on potential applications on geometrically deformed lattices. In a curved background, the natural expectation is that curvature works toward the restoration of an internal symmetry. I will show instead that, for topological defects, the competing action of the locally induced curvature and of boundary conditions generated by the non-trivial topology allows configurations where symmetries can be spontaneously broken close to the core.
[Seminar] "Constraining Quantum Gravity from the Bottom-up" by Dr. Scott Melville
2018-08-14Gravity on large scales is relatively well understood. For galaxies, planets and apples: we have Einstein’s General Relativity with which to make accurate predictions. But on small scales, where quantum mechanics becomes important, gravity is more difficult to understand, and as a result we lack precise descriptions of various natural phenomena (such as black holes).
One way to make progress in in our search for quantum gravity is to start from the large scale theory we know and love (at the ‘bottom’), and look for ways in which it may be modified and improved as we zoom in to smaller scales (going ‘up’ to a more fundamental theory).
Recent progress in ‘Effective Field Theory’ may shed some light on the connections between large and small scale physics. By exploiting certain physical properties of scattering probabilities (e.g. that they are unitary, causal and local), one can derive an infinite number of constraints which any large scale theory must satisfy in order to admit a sensible small scale completion.
In this talk, I will provide an overview of these new ‘positivity constraints’, and discuss their implications for quantum gravity.
QG group meeting - the complex action of GR and black hole entropy
2018-08-13QG group meeting
Speaker: Yasha Neiman
Title: "The complex action of GR and black hole entropy"
QG group meeting: Holography and Quantum Error Correction
2018-08-06QG group meeting
Speaker: Henry Stoltenberg
Title: Tales from PiTP 2018: Holography and Quantum Error Correction