We meet every other Thursday at 3:00PM in the grad lounge, room D129.

Previous year's GRADTALKS are available here:

- 2016-2017 School Year

- 2017-2018 School Year

**Date** |
**Speaker** |
**Presentation** |
**Abstract** |

September 13 2018 |
Niv Ramasubramanian |
What the hell is this QGP and how do we know about it by colliding heavy Ions? |
The physics of Quantum Chromodynamics is very different compared to Quantum
electrodynamics which leads to interesting effects like anti-screening, asymptotic freedom and
the formation of Quark Gluon Plasma(QGP). In this talk, I will focus on two experimental probes
which are used in understanding QGP and its evolution into Hadroinc states.
Time Projection Chamber (TPC)
The sequential melting of Upsilon states gives information about the Debye length of the QGP
and in an effort to understand this better, the sPHENIX is building a TPC so that we can
resolves the three upsilon states - Y(1S, 2S, 3S).
This section of the talk will be about the design and construction of the detector that is needed
to satisfy our physics requirement. This section will also include details of the prototype TPC
that we recently built and took it for test beam at Fermilab.
Analysis on Flow
Flow studies of QGP is another important probe to understanding its evolution into hadronic
states. This section will talk about experimental results as it stands today and how the MPC-EX
detector at PHENIX can help further these findings.
I will discuss the work I did in calibration of MPC-EX detector and my most recent work on
charged particle identification using EMCal |

October 4 2018 |
Dongwon Han |
Constraining cosmological parameters with the Cosmic Microwave Background |
Since the discovery of the Cosmic Microwave Background (Penzias & Wilson 1965), CMB has been a powerful probe to study the origin and the evolution of the universe. Weak lensing of CMB by the intermediate matter distribution smooths out the acoustic features in CMB power spectra, and convert CMB E-mode to B-mode. In this talk, we discuss how to internally reconstruct the underlying matter distribution from CMB. Furthermore, we will talk about how removing the lensing distortions on CMB can improve the cosmological parameter constraints.Since the discovery of the Cosmic Microwave Background (Penzias & Wilson 1965), CMB has been a powerful probe to study the origin and the evolution of the universe. Weak lensing of CMB by the intermediate matter distribution smooths out the acoustic features in CMB power spectra, and convert CMB E-mode to B-mode. In this talk, we discuss how to internally reconstruct the underlying matter distribution from CMB. Furthermore, we will talk about how removing the lensing distortions on CMB can improve the cosmological parameter constraints. |

October 18 2018 |
Julio Virrueta |
Holography, Entanglement and Dynamics |
Entanglement is by now understood as a basic property of quantum mechanical systems and as such it's study has several applications in very diverse areas of physics, from quantum information to high energy physics. One of this applications is the study of thermalization in quantum many-body systems via the calculation of the entanglement entropy as a time dependent quantity. In this talk I will introduce the basic concept of entanglement and how to characterize it's time evolution using tools from the AdS/CFT correspondence. |