Unless email announcement states otherwise, the seminars will take place every Wednesday during June and July in room PHYS 234. Refreshments (pizza+drinks) will be ready at 11:45 AM, and it is expected that the students will finish their food by the beginning of the talk at about 12:05. Talks last for about one hour.
Abstract:Living cells are exquisite sensors. In fact, their sensory precision approaches limits set by the basic laws of physics, and physicists have been interested in their sensory performance for decades. But cells also communicate. How are sensing and communication related? Can a cell beat these sensory limits by communicating with other cells? In this talk I will describe recent theoretical and experimental results that explore this question. I will show how communication allows cells to perform new behaviors that single cells cannot perform alone. This work extends the study of single-cell sensing to collective information processing by cell populations.
Abstract: We know Dark Matter exists, but what is it really made of? This talk will synthesize what we know about Dark Matter and what we don't know, and what we can learn with existing and upcoming experiments. A comprehensive overview over this bustling area of research will be given, from cosmological and astrophysical observations about the existence and nature of Dark Matter, to detectors in orbit and experiments deep underground. Rapid progress is made on all fronts, and with the most promising areas of parameter space currently being probed, the Quest for Dark Matter is in its most exciting phase.
Abstract: The VERITAS (Very Energetic Radiation Imaging Telescope Array System) Observatory consists of an array of 4 12 meter diameter imaging atmospheric Cherenkov telescopes sensitive to photons in the energy range from 100 GeVto 30 TeV. The collaboration is in the process of carrying out a long term science plan, to run through 2019, that addresses the nature of the Universe and the astrophysical objects that it contains. Foremost amongst the science areas is our search for dark matter by the indirect detection of its signature in astrophysical sources. I will first briefly outline our science program and then describe how we are able to detect very high energy photons from the ground using the imaging atmospheric Cherenkov technique. Then I will describe our indirect dark matter search that has been the focus of our research efforts over the past several years and finally I will elaborate on the next step forward in this field, CTA (the Cherenkov Telescope Array).
Abstract: We will discuss the physics of early processes in photosynthesis revealed by ultrafast laser spectroscopy. In particular, we will focus on the biological processes that can be only understood in terms of quantum physics.
Abstract: The release of tectonic stress during earthquakes produces shaking that causes great loss of life and property. But this stress release also provides a great opportunity to explore the Earth's interior. Earthquakes increase stress in the deep crust and mantle that, because of hot temperatures, cause these rocks to flow. This flow leads to deformation at the Earth's surface which can be observed by an array of GPS receivers for many years. These observations can then be used to constrain numerical models of postseismic flow that can illuminate the architecture and mechanical properties of rocks hundreds of kilometers below the surface. I will demonstrate this technique using postseismic deformation following the 2011 M9 Tohoku, Japan earthquake, illuminating what lies beneath Japan and what this teaches us about plate tectonics and earthquakes.
Abstract: What does AMOP mean? Will there be a movie with the pizza? Am I going to describe real adventures or is that just hype? Does quantum mechanics have to be weird? Eighty years ago, didn't Dirac say that all of atomic physics and chemistry was understood? Why should I still be trying to understand atomic, molecular, and/or optical physics? Couldn't I find something more interesting to study? When do atoms in near vacuum have collective properties? How does energy flow through a strongly coupled atomic gas? Where will the photon go? How come this abstract is only questions?
Abstract: Since the condensation of the first solids in our solar system 4.56 Gyr ago galactic cosmic ray (GCR) and solar energetic particle (SEP) interactions have been responsible nuclear transmutations. These cosmic-ray-produced (cosmogenic) nuclides serve as a clock that can be used to determine chronologies. Cosmogenic 3He was first discovered in iron meteorites. Subsequently, many pioneering searches for cosmogenic nuclides in both terrestrial and extra-terrestrial materials were conducted; these studies established techniques for cosmogenic nuclide extraction and established linkages between the extra-terrestrial and terrestrial applications.
Abstract: The GRAD TALK is about information on Graduate Schools and very specific to graduate school in physics. We will have the speakers talk about what does the process look like from the faculty, the administrative and from the student's point of view. You will get a lot of information about our Purdue Physics and Astronomy Graduate Program and the application process geared towards any physics and astronomy graduate program.