Colloquium

Junior and senior physics majors attend our biweekly colloquium series, held on Tuesday afternoons at 4:30 pm in Shanahan B460. The talks are open to all students and to the public, and are frequently attended by scientists from the other Claremont Colleges, Cal Poly Pomona, and others. The series features speakers from a broad range of institutions and fields of physics.
HMC Physics Colloquium shot
Nov. 8, 2005 Nathan Lewis, Caltech
Scientific Challenges in Sustainable Energy Technology
This presentation will describe and evaluate the challenges, both technical, political, and economic, involved with widespread adoption of renewable energy technologies.
  • First, we estimate the available fossil fuel resources and reserves based on data from the World Energy Assessment and World Energy Council. In conjunction with the current and projected global primary power production rates, we then estimate ...
Oct. 25, 2005 Mark Beck, Whitman College
Interference, Complementarity, Entanglement and All That Jazz
Technology has advanced to the point where it is possible for undergraduates to perform experiments exploring fundamental aspects of quantum mechanics--experiments observing behavior such as wave-particle duality, entanglement, and nonlocality. At Whitman College we are developing a series of such undergraduate laboratories, and I will describe some of these. In one we perform an interference experiment with single photons where ...
Oct. 11, 2005 Gabriela Canalizo, University of California at Riverside
Galaxy Collisions and the Birth of Quasars
Quasars are some of the most powerful objects in the Universe, and their study allows us to probe the early Universe. However, there are still many uncertainties regarding their nature and, in particular, the way in which they are formed. In this talk, I review the role of supermassive black holes, starbursts, and galaxy collisions in the life of quasars.
Sept. 27, 2005 Thomas D. Donnelly, Harvey Mudd College
Production and Application of an Aerosol of Micron-Scale Particles
A device that uses ultrasonic atomization of a liquid to produce an aerosol of micron-scale droplets will be discussed. This device represents a new approach to producing targets relevant to laser-driven fusion studies, and to the relatively untested subfield of nonlinear optics in which wavelength-scale targets are irradiated. The device has also made possible tests of fluid dynamics models in ...
Sept. 13, 2005 Kerry Vahala, Caltech
:mil:`Q` > Million Optical Microresonators on Silicon Chips
A novel laser processing method has been applied to create optical micro-resonators having Q factors as high as 500 million on silicon wafers. The combination of Ultra-high-Q and small mode volume opens up new applications for wafer based resonators. In this talk I will first review the processing and passive optical properties of these devices and then describe their application ...
Sept. 6, 2005 HMC juniors and seniors, Harvey Mudd College
What I Did on My Summer Vacation: Off-Campus Summer Research Experiences
April 26, 2005 Mark Vagins, University of California at Irvine
Close Encounters of the Absurd Kind — A Scientist Looks at UFO’s
Look! Up in the sky! It’s a bird? It’s a plane? It’s... a weather balloon? What’s the real deal with America’s ongoing UFO obsession, anyway? What does a professional astrophysicist with an interest in the offbeat think about the whole paranormal scene? Come on an exploration of the claims and issues involved, both from a scientific perspective and through the ...
April 19, 2005 Jerry Gollub, Haverford College
Chaotic Dynamics of Mixing in Fluids
The process by which an impurity is dispersed in a stirred fluid is important for many areas of science and engineering. It can occur as a consequence of turbulence (e.g. in stirring coffee), but mixing also occurs even in some laminar flows that cause nearby fluid elements to separate exponentially in time. This process is sometimes called "chaotic mixing". Until ...
April 12, 2005 Wilson Ho, University of California at Irvine
Visualization of Quantum Phenomena
The unique capabilities of the scanning tunneling microscope (STM) enable new opportunities for the control and investigation of matter and its transformation at the atomic and molecular scales. Some of the problems that are routinely used in the introduction to quantum mechanics, such as the particle tunneling, Brownian motion of molecules, and particle in a one-dimensional box, can be realized ...
March 29, 2005 Stanley Klein, University of California at Berkeley
New Methods for Imaging Brain Activity in Space and Time

When one looks at tiny flashing light, electrical currents are induced in the brain’s cortex and blood flow is altered. The altered blood flow can be measured using functional MRI, giving spatial information of the brain activity, but valuable information about the temporal dynamics is lost due to the sluggish nature of the blood flow. Our focus is on making ...

March 8, 2005 Theresa Lynn, Caltech
Dances With Atoms and Photons: Steps Toward Quantum Information Technology
The Schrödinger-cat strangeness of quantum states threatens classical information technology but at the same time offers the potential for great advances in computing and communications. A principal challenge in designing actual quantum logic devices is the need to control quantum states and simultaneously protect delicate properties like quantum phase and entanglement. How can we protect information encoded in a quantum ...
Feb. 22, 2005 David Hafemeister, Cal Poly San Luis Obispo
National Academy Study on the Comprehensive Nuclear Test Ban Treaty
After the 51-48 defeat of the CTBT in the Senate, General John Schalikashvili (Former Chair, Joint Chiefs of Staff) commissioned the National Academy of Sciences to examine the following technical issues, which will be summarized*:
  • US Capacity to maintain safety/reliability and design/evaluation of its nuclear stockpile without testing
  • International/US capability to monitor a nuclear test ban, ...
Feb. 8, 2005 Scott Fraser (’76), Caltech
Was Leonardo Right? New Insights into the Mechanics of Cardiovascular Development
Jan. 25, 2005 Kate Hutton, Caltech Seismological Laboratory
The Largest Quake in 40 Years
Dec. 7, 2004 Jonathan L. Feng, University of California at Irvine
Black Holes and Extra Dimensions
Of the four known forces -- gravity, electromagnetism, and the weak and strong forces -- gravity is by far the weakest. The weakness of gravity may not be an intrinsic property, however, but may result from the dilution of gravity in extra spatial dimensions. Diverse experiments, ranging from tabletop probes of Newtonian gravity to km-scale cosmic ray detectors, are now ...