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Dublin Area Theoretical Physics Colloquium
The colloquium is organized by the School of Mathematics and held
each Monday at 4.00 PM in the
AbstractsDate: Sep. 30th Speaker:Poul Henrik Damgaard Title: Lattice Simulations of N=4 Super Yang-Mills Theory Abstract: I will discuss on-going work to simulate N=4 supersymmetric lattice gauge theory with an exactly preserved supersymmetry. The construction is based on what in continuum language is known as topological twisting. This provides the first example of a non-trivial four-dimensional non-Abelian lattice gauge theory that is, apparently, conformal at all bare couplings.
Date: Oct. 7th Speaker: John Bulava Title: Hadron scattering phase shifts and resonance properties using Lattice QCD Abstract: The last few years have seen significant improvement in calculations of the finite-volume spectrum of QCD using lattice field theory simulations. This spectrum contains a wealth of information about hadron scattering phase shifts and resonance properties. I will review the recent progress in this field and highlight several benchmark calculations. However, in order to make quantitative predictions, the continuum limit must be taken. Current efforts toward proceeding to smaller lattice spacings will also be discussed.
Date: Oct. 14th Speaker: Tomasz Korzec Title: Simulating the All-Order Strong Coupling Expansion: Ising Gauge Theory Abstract: Abelian lattice gauge theories are exactly equivalent to certaini random surface models.Based on this equivalence, a novel simulation technique is presented. It allows one to estimate Polyakov line correlation functions precisely with relative errors that do not increase with the separation of the two lines. Other observables that are difficult to measure in the original formulation, like the excess free energy due to twisted boundary conditions, become easily accessible.
Date: Oct. 21st Speaker: Christian Brynes Title: Inflation after the Planck satellite Abstract: I will summarise our knowledge of inflation in light of the first major data release from the Planck satellite this year. The satellite has made the most accurate ever observations of the cosmic microwave background temperature (CMB), which is likely to remain the "state-of-the-art" for perhaps a decade. The inflationary paradigm has been subjected to its sharpest test yet and remains an excellent fit to the data. However certain classes of models are now either under pressure or ruled out. Particular attention is paid to the constraints on non-linear perturbations, which would give rise to non-Gaussian perturbations of temperature perturbations. In the second part of the talk I will focus on how the very small scale perturbations could be measured. They are too small to be seen in the CMB and currently largely unconstrained. Possibilities include searching for primordial black holes and gravitational waves.
Date: Nov. 11th Speaker: Dymtro Volin Title: Quantum spectral curve for AdS/CFT spectrum Abstract: The AdS/CFT spectral problem, i.e. computation of conformal dimensions in planar N=4 SYM, was a hot topic during the last decade, with more than thousand publications devoted to it. Though it was formally solved by TBA and more recently simplified by FiNLIE, the solution was never formulated in a clear and lucid style. In this talk I will present our new advancement which unveil the whole beauty of the AdS/CFT spectrum: it is described by a "quantum spectral curve" -- matrix Riemann-Hilbert equations on a few Q-functions. A given state in the spectrum is encoded into an asymptotics at infinity and into a solution of the exact Bethe equations which, in the spirit of functional Bethe Ansatz, are nothing but the regularity conditions on the Q-functions. During the talk I will also demonstrate the efficiency of the new approach by computing the Konishi anomalous dimension up to 8 loops in real time using a single CPU.
Date: Nov. 18th Speaker: Title: Abstract:
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| Current organizers: Dr. John Bulava Dr. Tristan McLoughlin Dr. Dymtro Volin |
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