Fermilab Colloquium Calendar Archive 2021

  Appropriate for physicists     Appropriate for all lab staff and members of the public
Raw date Event date Title Speakers Host Summary Links
20210106 Jan. 6, 2021 No colloquium
20210113 Jan. 13, 2021 Open
20210120 Jan. 20, 2021 Open
20210127 Jan. 27, 2021 Open
20210203 Feb. 3, 2021 Open
20210210 Feb. 10, 2021 Open
20210217 Feb. 17, 2021
Quantum Squeezing and Quantum Correlations in advanced LIGO
Lee McCuller, Massachusetts Institute of Technology and the LIGO Laboratory Chris Stoughton Optical interferometers have begun a new era of astrophysics by measuring length to such precision that gravitational waves (GW) from distant collisions of black holes and neutron stars are now regularly observed. This past observing run, the global GW observatory network itself entered a new era, whereby every detector's sensitivity is enhanced using quantum squeezed states of light. This talk examines the implementation of squeezing in the Laser Interferometer Gravitational-Wave Observatory (LIGO), detailing how measurement back action affects the 40kg mirrors of LIGO in the form of quantum radiation pressure noise and how squeezing allows us to reduce back action using quantum correlations between the light and mirrors. LIGO plans to yet improve on squeezing with future upgrades to not only improve squeezed state quality, but also to install a quantum filter cavity so both imprecision and back-action are reduced in LIGO at the same time. video
20210224 Feb. 24, 2021
Zeolite water purification at Tikal, an ancient Maya city in Guatemala
Kenneth Barnett Tankersley, Ph.D. (Piqua Tribe of Alabama), University of Cincinnati Chris Stoughton Evidence for the oldest known zeolite water purification filtration system occurs in the undisturbed sediments of the Corriental reservoir at the Maya city of Tikal, in northern Guatemala. The Corriental reservoir was an important source of drinking water at Tikal during the Late Preclassic to Late Classic cultural periods. X-ray diffraction analysis (XRD) and six AMS radiocarbon ages show that between ~ 2185 and 965 cal yr B.P. the drinking water in the Corriental reservoir water was filtered through a mixture of zeolite and coarse, sand-sized crystalline quartz. Zeolite is a non-toxic, threedimensionally porous, crystalline, hydrated aluminosilicate with natural adsorbent and ion exchange properties, which removes harmful microbes as well as dispersed insoluble and soluble toxins from drinking water. The occurrence of zeolite in Corriental reservoir sediments expands our understanding of the earliest history of water purification and the long-term sustainability of an ancient Maya city. Video
20210303 March 3, 2021 Open
20210310 March 10, 2021 Open
20210317 March 17, 2021
There are particles in my whiskey! (The science of whiskey colloids)
Stuart Williams, University of Louisville Dan Hooper Suspended particles, also known as colloids, form when you dilute whiskey with water and/or chill it. This phenomenon has been observed by whiskey distillers for years, typically during filtration or quality control. Our research investigates the formation of these whiskey colloids and how they influence surface tension and form chemical monolayers on the interface of microdroplets. During evaporation these monolayers collapse and form patterns unique to each brand of whiskey, which may be used for counterfeit identification. Further, this mechanisms seems to be unique to American whiskey which is characterized by being matured in new charred oak barrels. This presentation will introduce the basic science of bourbon whiskey, characterization of whiskey colloids, and how “whiskey webs” form during droplet evaporation. Video
20210324 March 24, 2021 Open
20210331 March 31, 2021 Open
20210407 April 7, 2021 Open
20210414 April 14, 2021
A no-lose theorem for discovering the new physics of (g-2)
David Curtin, University of Toronto Dan Hooper Recent measurements by the Fermilab g-2 experiment seem to confirm the long-standing muon g-2 anomaly first measured by BNL. If theoretical and experimental progress in the coming years confirms the deviation from the Standard Model (SM) expectation, this would represent the first solid evidence of Beyond SM (BSM) physics. Over the years, many models have been proposed to account for the g-2 anomaly, but we ask a simple question: how heavy could the new physics be, based only on unitarity and optionally general flavour or naturalness considerations? We perform a model-exhaustive analysis of all possible BSM solutions to the anomaly and analyze their phenomenology. Our results show that a muon physics program starting with a low-energy fixed target experiment and culminating in a  30 TeV muon collider is guaranteed to discover new physics connected to g-2.
20210421 April 21, 2021 Open