Adam Riess

Adam Riess is an American astrophysicist whose pioneering work provided key evidence for the accelerating expansion of the universe. He is a professor of astronomy and physics at Johns Hopkins University and a senior member of the Space Telescope Science Institute. Riess shared the Nobel Prize in Physics in 2011 with Saul Perlmutter and Brian Schmidt for this revolutionary discovery, which implied the existence of dark energy. His research continues to focus on measuring the Hubble constant and refining our understanding of cosmology.

Early life and education

Born in Washington, D.C., Riess developed an early interest in science and mathematics. He attended the prestigious Massachusetts Institute of Technology for his undergraduate studies, graduating with a degree in physics. He then pursued his doctorate in astrophysics at Harvard University, where he worked under the supervision of renowned astronomer Robert Kirshner. His doctoral research involved the study of Type Ia supernovae, which would become central to his later groundbreaking work. During this period, he also spent time conducting research at the University of California, Berkeley.

Career and research

After completing his Ph.D., Riess held a postdoctoral fellowship at the University of California, Berkeley before joining the staff of the Space Telescope Science Institute in Baltimore. He later became a professor at Johns Hopkins University, where he leads a research group focused on observational cosmology. His career has been heavily intertwined with major astronomical projects, particularly the Hubble Space Telescope, which he has used extensively for precise measurements of cosmic distances. Riess is a leading figure in the High-z Supernova Search Team, an international collaboration that played a pivotal role in his Nobel-winning discovery.

Discovery of the accelerating universe

In the late 1990s, Riess, alongside team leader Brian Schmidt and the competing Supernova Cosmology Project led by Saul Perlmutter, used observations of distant Type Ia supernovae as standard candles to measure the expansion history of the universe. Contrary to the prevailing expectation that the expansion was slowing down due to gravity, their data revealed that the expansion rate was increasing. This shocking result, first published in 1998, provided the first direct evidence for an unknown repulsive force, later termed dark energy, dominating the cosmos. This discovery fundamentally altered the standard model of cosmology and reshaped our understanding of the ultimate fate of the universe.

Awards and honors

Riess's contributions have been recognized with numerous prestigious awards. He shared the 2011 Nobel Prize in Physics with Perlmutter and Schmidt for the discovery of the accelerating expansion. Earlier, he received the 2006 Shaw Prize in Astronomy and the 2015 Breakthrough Prize in Fundamental Physics. He is a member of the National Academy of Sciences and a fellow of the American Academy of Arts and Sciences. Other notable honors include the MacArthur Fellowship (often called the "Genius Grant") in 2008 and the Einstein Medal from the Albert Einstein Society. His work continues to be celebrated through lectureships like the Henry Norris Russell Lectureship.

Personal life

Adam Riess is married and has two children. He maintains a strong connection to the scientific community in Baltimore, where he lives and works. An avid communicator of science, he frequently gives public lectures and participates in outreach programs to explain complex cosmological concepts. Beyond his research, he has expressed a deep fascination with the philosophical implications of his discoveries regarding the nature and composition of the universe.

Category:American astrophysicists Category:Nobel laureates in Physics Category:Johns Hopkins University faculty