Events

## SMARTech Video Archive

Sep

15

Hydrodynamics is the theory describing collective behaviors of fluids and gases. It has a very long history and is usually considered to belong to the realm of classical physics. In recent years, it has been found that, in many cases, hydrodynamics can manifest a purely quantum effect --- anomalies. We will see how this new appreciation of the interplay between quantum and classical physics has emerged, unexpectedly, through the idea of gauge/gravity duality, which originates in modern string theory. I will briefly mention the possible relevance of the new findings to the physics of the quark...

Sep

08

The Nuclear Spectroscopic Telescope Array, the first focusing high-energy X-ray (3 – 79 keV) telescope in orbit, extends sensitive X-ray observations above the band pass where Chandra and XMM-Newton operate. With an unprecedented combination of sensitivity, spectral and imaging resolution above 10 keV, NuSTAR is advancing our understanding of black holes, neutron stars, and supernova remnants. I will describe the mission, and present science highlights from the two-year baseline mission.

Sep

05

Coalescing binaries are among the most promising sources of gravitational waves for the advanced generation of ground based interferometers. Moreover they have been suggested as a possible progenitors of short gamma-ray bursts. The gravitational signal emitted in the late inspiral of such systems encodes the deformability properties of the neutron star, which depend on the behavior of matter in the stellar interior.

In this talk I will discuss how the detection of this signal can be used to extract information on the neutron star equation of state, and on the physics of the surrounding environment.

Aug

28

Fivefold symmetry is incompatible with the translational order in all 17 plane groups and is therefore of fundamental interest for two dimensional crystallization processes. A model study on single crystal surfaces, e.g. Cu(111), has been carried out to better understand the fundamental principles of intermolecular interactions between fivefold symmetric corannulene and its derivatives in two-dimensional clusters and lattices, including those consisting of fivefold bowl-shaped (buckybowl) molecules. Rational molecular design and state of the art surface science methods, e.g. Scanning Tunneling...

Aug

21

Development of laser-based techniques to cool and manipulate trapped atoms led to a quantum revolution, with applications ranging from creation of novel phases of matter to realization of new tools for navigation and timekeeping. Because of their comparatively richer internal structure, molecules offer additional potential for quantum-controlled chemistry, quantum information processing, and precision spectroscopy. However, obtaining control over the rotational quantum state of trapped molecules, a prerequisite for most applications, has presented a significant challenge because of the large number of initial states typically...

Jul

14

Event Title: Multi-messenger Astrophysics: Challenges and Opportunities in Big data and Computing

Summary Sentence:

__a talk__...Jun

11

After a general introduction to the Lagrangian of QCD (Quantum Chromodynamics) and its symmetries, I will present the QCD Sum Rules approach for studying hadronic properties. This will be generalized to a finite temperature scenario, where we expect that phase transitions like deconfinement and/or chiral symmetry restorations should occur. In particular we will present our results for the rho meson spectrum, reconstructed from the dimuon spectrum in heavy ion collisions, and for charmonium resonances which could survive beyond the critical temperature. I will try to avoid technical details,...

May

27

Intrinsically disordered proteins (IDPs), which form over a third of human proteins, challenge the structure-function paradigm because they function without ever folding into a unique three-dimensional structure. A particularly fascinating example of IDP function is the gating mechanism of the nuclear pore complex (NPC). The NPC is a large macromolecular structure that gates nanoscale pores in the nuclear envelope and controls all nucleo-...

May

19

**Note: This is a WEBINAR**

The theory of Lagrangian Coherent Structures (LCSs) has advanced significantly over recent years, and now covers both hyperbolic and elliptic material surfaces in unsteady flow. Parabolic (i.e., jet-type) LCSs have, however, remained outside the reach of the theory, despite their significance in oceanic and atmospheric transport.

Here I discuss a new variational approach to general shearless transport barriers in two-dimensional unsteady flows, which covers both hyperbolic and parabolic LCSs. I also describe a computational implementation of this new...

Apr

30

Biological flows are vital for the conservation of life and indispensable commodity of living organisms. Morphological structures of living organisms and biological flow phenomena in...

Apr

24

Given that many diverse astrophysical systems are susceptible to relativistic hydromagnetic turbulence, it is surprising how little is presently known about how they manifest chaotic flow. Of primary interest is to establish a basic understanding of how the small-scale turbulent dynamo, whereby kinetic energy of the flow is converted into magnetic energy, operates in these systems. This process is thought to be instrumental in both stellar and galactic magnetogenesis, and may also be at work in relativistic astrophysical jets and their central engines.

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Apr

21

The fractional quantum Hall effect (FQHE) states in the second Landau level have attracted growing interests and intensive theoretical and experimental investigations due to them possibly being non-Abelian states. Recently, we systematically examined the spin polarization of the FQHE states in a series of high quality, low density two dimensional electron systems. Evidence of spin transition was observed, suggesting a more complicated nature of the FQHE ground states in the second Landau level.

Apr

16

We utilize electroconvecting liquid crystal samples as a test bed from non-equilibrium driven systems. I will discuss results from the application of a novel mathematical analysis that incorporates time-delay embedding and diffusion maps to elucidate the underlying geometry in this system. This analysis permits the discrimination of different dynamical states from empirical data and is used to demonstrate multistability in this system. In addition we investigate the effects of an abrupt transition to defect turbulence on the structure and energy flow in this system.