The CTP Lunch Club meets every Friday at noon in the Cosman seminar room, 6C-442 (provided that there are sufficient speakers). A light lunch will be provided begining at 11:50am (usually pizza, however some other options may be explored).
The seminars are designed for graduate students and should be accessible to all students. First year students are particularly encouraged to attend so that they may learn about research being performed in the CTP.
Email notification of the club will be sent to the ctp-all, ctp-postdocs and ctp-students email lists as appropriate. If you wish to speak, or have suggestions about speakers and/or possible workshop topics, please contact the organizers:
Christiana Athanasiou and Nabil Iqbal
For a very long time, people have considered the problem of discriminating between two different quantum states. Since then information-theoretic ideas such as Quantum Hypothesis Testing and Quantum Chernoff Bound have been particularly well-developed. A natural extension of the field is then to apply these techniques to
detecting and imaging objects using quantum effects such as squeezing
and entanglement. I shall discuss some of the techniques available
to discriminate quantum states, and show how much improvement we can
get by using quantum imaging instead of traditional classical imaging,
even in the presence of large amounts of noise and very high loss.
Some Comments on de Sitter Holography
The possibility of a de Sitter/Conformal Field Theory correspondence
many open questions is discussed. If time permits, we discuss the notion of
holographic renormalization group flows and their potential relation to
Basic ideas of effective field theories
Effective field theories are widely used in theoretical physics. I discuss the idea of effective field theories in general and explain why they are useful. Also the application of them is explained using a few examples. I will introduce some basic material for soft-collinear effective theory and its uses in current research.
We will describe a string theory method to compute the strong
coupling behavior of the scattering amplitudes of gluons in planar N=4 SYM and quarks in planar N=2 SYM in the probe approximation. The seminar will be based on 0705.0303 and 0710.0393 (hep-th).
Lattice QCD: An Introduction for Beginners
I will describe the basic ideas and techniques of lattice QCD, the only known non-perturbative method to study the low-energy properties of QCD from first principles. By introducing a discrete space-time lattice, we regulate the theory with an explicit momentum cutoff. More importantly, this discretized version of QCD can be simulated on the computers using Monte Carlo techniques, in a way similar to statistical mechanics, which then enables us to investigate many non-perturbative phenomena.
Integrable models are often characterised by an infinite dimensional
non-abelian symmetry algebra. In many cases, this algebra forms what is called a Yangian. Such a structure has an independent life in mathematics. We will try to give a brief introduction to the physics and the mathematics of Yangians.
The jet mass of the top quark
I will discuss the use of effective field theories in processes with double top production. I will show how in this framework one can define a mass for the top quark which has good theoretical properties and how we can get high precision results.
Partition functions of 3d pure gravity
The three dimensional pure gravity has been conjectured to be dual to a holomorphically factorized extremal conformal field theory. As a first step of an attempt to reconstruct the dual CFT from its partition functions (on general Riemann surfaces), we compute the latter from the gravity path integral, by summing over gravitational instantons. These instantons are hyperbolic three manifolds with a conformal boundary. In particular, we conjecture an expression for the exact contribution from the instantons that are handlebodies.
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