Postdoc Research Spotlight Seminars
In-Person PHYS 401
Location
Physics : 401
Date & Time
March 26, 2025, 11:00 am – 12:00 pm
Description
TITLE: "Postdoc Research Spotlight Seminars”
Description: This week, three postdocs in the Physics Dept will give talks on their current research. Onic Shuvo, Moallison Ferreira Calvalcante, and Emery Doucet will be speaking. Their talk titles and abstracts are given below. (Each talk will be ~ 12 min + 5 minutes for questions, to fill the normal 1 hour seminar period.)
Description: This week, three postdocs in the Physics Dept will give talks on their current research. Onic Shuvo, Moallison Ferreira Calvalcante, and Emery Doucet will be speaking. Their talk titles and abstracts are given below. (Each talk will be ~ 12 min + 5 minutes for questions, to fill the normal 1 hour seminar period.)
Speaker: Onic I. Shuvo
Title: "Chasing Cosmic Jets: Understanding Extragalactic Jets from Newborn Outflows to Their Hidden Emission Mechanisms"
Abstract:
My research focuses on the powerful jets launched by supermassive black holes in active galaxies—including cases where jets are newly formed, mysteriously absent, or behaving in unexpected ways. I was part of the team that, for the first time, dynamically observed the evolution of a newborn jet in 1ES 1927+654, challenging traditional AGN models. I also study hard-spectrum optical jets across multiple wavelengths to uncover the true origin of their X-ray emission—whether it's from inverse Compton scattering of CMB photons (IC/CMB) or a synchrotron process. Additionally, I explore the radio variability of 72 radio-quiet PG quasars, searching for signs of transient behavior and hidden jet activity.
Speaker: Moallison Ferreira Calvalcante
Title: "Emergence of X-states in a quantum impurity model"
Abstract:
In this talk, I will explore dynamical signatures of localized edge modes in a many-body system with an impurity. The existence of such modes is shown to drastically change the relaxation and propagation of correlations in the system, leading to the phenomenon of information trapping. In particular, when there are two localized edge modes, the state describing the trapped information has a X form and carries genuine quantum correlations.
Speaker: Emery Doucet
Title: 'Redundancy, Objectivity, and Compatibility in Quantum Measurements"
Abstract: Many of the differences between the quantum and classical worlds are most visible when studying measurements. For example, classical measurements are repeatable and their outcomes are objective, whereas only measurements of quantum systems which exhibit quantum Darwinism have these properties and so support the emergence of classicality. Another difference is that the outcomes of sets of classical measurements can always be described with joint probability distributions, whereas sets of quantum measurements may require quasiprobabilities. Only some quantum models appear classical in the sense that they only require ordinary probabilities to describe joint measurements. In this talk, we take these two notions of how a quantum model may appear effectively classical and provide a broad classification of Hamiltonians which support them. Interestingly, we show that each approach leads to exactly the same set of Hamiltonians, implying that these properties of classical measurements are deeply related.
