Dark matter (Astronomy)

Interview with Surjeet Rajendran, Associate Professor of Physics at Johns Hopkins University. He provides an overview of his current research activities with David Kaplan in black hole physics, new short distance forces, and modifications of quantum mechanics, and he shares his reaction on the recent g-2 muon anomaly at Fermilab. Rajendran explains why he identifies as a “speculator” in physics, he recounts his childhood in Chennai, India, and he discusses his grandparents’ communist activism, his Jesuit schooling, and how science offered a refuge for rebellion from these influences. He explains his decision to transfer from the Indian Institute of Technology to Caltech as an undergraduate, where he worked with Alan Weinstein on LIGO. Rajendran discusses his graduate research at Stanford, where KIPAC had just started, and where Savas Dimopoulos supervised his work on PPN parameters and solving the seismic noise problem on atom interferometers for LIGO. He describes his postdoctoral work, first at MIT and then at Johns Hopkins, when he began to collaborate with Kaplan on axion detection and the electroweak hierarchy problem. Rajendran explains the rise and fall of the BICEP project, and his Simons Foundation supported work on CASPEr. He discusses his interest in bouncing cosmology and firewalls in general relativity, and he conveys optimism that LIGO will advance our understanding of black hole information. At the end of the interview, Rajendran reviews his current interests in the Mössbauer effect, and explains how nice it was to win the New Horizons in Physics prize, and he prognosticates on how the interplay between observational and theoretical cosmology will continue to evolve and perhaps resolve fundamental and outstanding questions in the field.

Interview with Murdock Gilchriese, Senior Physicist at Lawrence Berkeley National Lab. He discusses his contribution to the major project, LUX-ZEPLIN (LZ) and the broader search for dark matter, he recounts his parents’ missionary work, and his upbringing in Los Angeles and then in Tucson. Gilchriese describes his early interests in science and his undergraduate experience at the University of Arizona, where he developed is expertise in experimental high energy physics. He discusses his graduate work at SLAC where he worked with Group B headed by David Leith, and he describes his research in hadron spectroscopy. Gilchriese explains his postdoctoral appointment at the University of Pennsylvania sited at Fermilab to do neutrino physics before he accepted his first faculty position at Cornell to help create an e+/e- collider and the CLEO experiment. He discusses the inherent risk of leaving Cornell to work for the SSC project with the central design group, and then as head of the Research Division. Gilchriese describes his subsequent work on the solenoidal detector and his transfer to Berkeley Lab to succeed George Trilling and to join the ATLAS collaboration. He explains the migration of talent and ideas from the SSC to CERN and discusses the research overlap of ATLAS and CMS and how this accelerated the discovery of the Higgs. Gilchriese describes his next interest in getting into cosmology and searching for dark matter as a deep underground science endeavor, and he explains why advances in the field have been so difficult to achieve. At the end of the interview, Gilchriese describes his current work on CMB-S4, his advisory work helping LBNL navigate the pandemic, and he reflects on the key advances in hardware that have pushed experimental physics forward during his career.

Interview with Tony Tyson, Distinguished Research Professor at UC Davis in the Department of Physics and Astronomy. The interview begins with Tyson sharing stories from his childhood in southern California and his early interest in ham radio. He discusses his undergraduate studies at Stanford and his introduction to low-temperature physics. Tyson describes his graduate studies at University of Wisconsin and a fellowship at University of Chicago. He explains his thesis experiment on phase transitions and discusses having both Dave Douglas and Chandrasekhar as advisors. Tyson recalls being recruited by Bell Labs and talks about his initial work there on gravitational radiation. He describes branching out into cosmology and astrophysics and recounts his time in John Wheeler’s gravity group at the Institute for Advanced Study. Tyson reflects on the impact of CCDs and his role in their development for astronomy. Tyson also discusses the evolution of the LSST project, of which he is the founding director. Topics include site selection, funding and fundraising, and the renaming of the project for Vera Rubin. The interview concludes with Tyson sharing his hopes for the future of the field and his excitement for the new discoveries that will inevitably come from the LSST. 

Interview with James Gunn, American astronomer and Emeritus Eugene Higgins Professor of Astronomy at Princeton University. Gunn discusses his graduate work at Caltech where he worked with Guido Munch. He describes his graduate thesis on the correlation function of galaxies and recalls his growing interest in cosmology at the time. Gunn traces the development of dark matter research during the 1970s and 1980s, reflecting on the important contributions of his peers as well as his own. He discusses his other research interests such as Omega matter and virial discrepancy. Gunn also describes his role in the growth of the cosmology department at Caltech. 

Interview with astrophysicist and cosmologist Neta Bahcall, the Eugene Higgins Professor of Astronomy at Princeton University. Bahcall discusses her undergraduate studies in physics and math in Israel before her move to Caltech. She recounts her PhD work with her advisor, William Fowler, as well as collaborations with Maarten Schmidt. Bahcall explains how she was studying nuclear physics at Caltech when she first learned of the virial discrepancy and became interested in galaxy clusters, prompting her to shift her studies toward astronomy. Bahcall describes her work on quasars and the beginnings of her work in cosmology. Throughout the interview, she provides an overview of galaxy cluster research in the 1970s, as well as the beginnings of dark matter research. Bahcall discusses many of her influential papers over the years, on topics such as clusters, large construction, dark matter and omega matter. She describes how her research on clusters relates to cosmology, as well as how her work intersects with radio astronomy. Bahcall reflects on the impact of being a woman in the field, and at the end of the interview, she shares memories from the 1985 IAU meeting on dark matter. 

Interview with Peter Donald MacDougall Parker, Professor Emeritus of Physics at Yale. Parker recounts his childhood growing up in New York City and Massachusetts, attending Amherst College, the excitement of being a graduate student at Caltech in the 1960s working on nuclear physics and nuclear astrophysics, his postgraduate position at Brookhaven National Laboratory, and his move to Wright Nuclear Structure Laboratory at Yale University in 1966. Parker recalls over five decades of research, teaching, and service work that includes: experimental nuclear physics and astrophysics work using tandem accelerators, solar neutrino flux, and dark matter search; teaching every single physics course offered at Yale and developing a new course; committee work; the gradual changes in gender demographics in the physics department at Yale. Also prominently mentioned are Willy Fowler, Richard Kavanaugh, Thomas Tombrello, John Bahcall, Ray Davis Jr., Allan Bromley, and his twin brother Robert Parker.

The interviewee has not given permission for this interview to be shared at this time. Transcripts will be updated as they become available to the public. For any questions about this policy, please contact [email protected].

The interviewee has not given permission for this interview to be shared at this time. Transcripts will be updated as they become available to the public. For any questions about this policy, please contact [email protected].

Interview with Katherine Freese, Director of the Weinberg Institute for Theoretical Physics, the Jeff and Gail Kodosky Endowed Chair in Physics at UT Austin, and the Director of the Texas Center for Cosmology and Astroparticle Physics (TCCAP). Freese begins the interview with an overview of terminology, such as cosmology, astrophysics, and astroparticle physics and the delineation between these fields. Then she describes her childhood in Bethesda, Maryland where both her parents were scientists. Freese recalls beginning college at age 16, starting at MIT and then transferring to Princeton. She recounts taking time off after her undergraduate studies, before deciding to pursue graduate studies. Freese began grad school at Columbia but switched to the University of Chicago to work on neutrino physics with David Schramm. She discusses her first post-doc at Harvard, working on WIMPs and dark matter, and then her second post-doc at Santa Barbara with Frank Wilczek. Freese then recalls returning to MIT as a professor where she worked with Alan Guth and Josh Frieman on cosmic inflation. She talks about her transition to the University of Michigan and the exciting developments in cosmology at the time, as well as her introduction to dark energy. Freese describes her more recent involvement with NASA’s SPIDER experiment, as well as the honor of being named to the National Academy of Sciences. Freese discusses the amazing opportunity of being the Director at the Nordic Institute for Theoretical Physics and ends the interview with her hopes for the future of cosmology, namely her hope for finding dark matter.

In this interview, Paul Schechter, the William A. M. Burden Professor of Astrophysics, Emeritus, at MIT discusses his time as an undergraduate student at Cornell University under the mentorship of Al Silverman and his involvement working on the Cornell synchrotron, as well as Silverman’s influence on his decision to attend Caltech for graduate school. Schechter discusses his collaboration with Bill Press on the issue of dark matter and the eventual creation of their model, the Extended Press-Schechter. He also details how studying the infall of galaxies toward the Virgo Cluster, and the subsequent paper he contributed to on the topic, were the most exciting part of his time working at the Kitt Peak National Observatory. Schechter describes his later interests in gravitational lensing and his efforts to create higher quality images for Magellan telescopes. Lastly, he discusses his desire to find the stellar mass fraction in galaxies.