Joaquin Daniel Vieira

Faculty Affiliate

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Joaquin Daniel Vieira

Primary Research Area

  • Astrophysics / Gravitation / Cosmology
229 Astronomy Building
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Biography

Professor Vieira is an observational cosmologist who works across the electromagnetic spectrum. His scientific interests include: the cosmic microwave background, experimental tests of inflation; dark matter; dark energy; gravitational lensing; high redshift galaxies; instrumentation.

He builds experiments, conducts cosmological surveys, and performs observations of the distant Universe. He works with data from the South Pole Telescope, Herschel, Hubble, Spitzer, Chandra, and ALMA.

He is currently helping to build future mm and sub-millimeter facilities, pondering the cosmic evolution of dust and ionized carbon, and working to detect signatures of inflation through polarized measurements of the Cosmic Microwave Background.

Prof. Vieira is currently looking for grad students to work on the following projects:

1) Micro-fabrication of novel photon detectors for astronomy and cosmology.

2) Instrumentation for a new camera for the South Pole Telescope.

3) Analysis of South Pole Telescope survey data.

4) Observations of strong gravitationally lensed galaxies at high-redshift.

Students are welcome and encouraged to drop by with questions about science, instrumentation, or available research projects.

Research Interests

  • High redshift galaxies
  • cosmic dust
  • Dark matter, dark energy, inflation, relic neutrino background
  • Gravitational Lensing
  • Instrumentation
  • Extragalactic Surveys
  • The cosmic star formation history and the epoch of reionization
  • The Early Universe
  • The Cosmic Microwave Background
  • Experimental Cosmology

Related news

  • Research
  • Astrophysics
  • Astrophysics/Cosmology

A team of scientists using the Dark Energy Camera (DECam), the primary observing tool of the Dark Energy Survey (DES), was among the first to observe the fiery aftermath of a recently detected burst of gravitational waves, recording images of the first confirmed explosion from two colliding neutron stars ever seen by astronomers.

Scientists on the DES joined forces with a team of astronomers based at the Harvard-Smithsonian Center for Astrophysics (CfA) for this effort, working with observatories around the world to bolster the original data from DECam. Images taken with DECam captured the flaring-up and fading over time of a kilonova – an explosion similar to a supernova, but on a smaller scale – that occurs when collapsed stars (called neutron stars) crash into each other, creating heavy radioactive elements.

Two scientists at the University of Illinois at Urbana-Champaign are members of the DES collaboration, Professors Joaquin Vieira of the Departments of Astronomy and of Physics and Felipe Menanteau of the Department

  • Research
  • Astrophysics/Cosmology

Imagine planting a single seed and, with great precision, being able to predict the exact height of the tree that grows from it. Now imagine traveling to the future and snapping photographic proof that you were right.

If you think of the seed as the early universe, and the tree as the universe the way it looks now, you have an idea of what the Dark Energy Survey (DES) collaboration has just done. In a presentation today at the American Physical Society Division of Particles and Fields meeting at the U.S. Department of Energy’s (DOE) Fermi National Accelerator Laboratory, DES scientists will unveil the most accurate measurement ever made of the present large-scale structure of the universe.

These measurements of the amount and “clumpiness” (or distribution) of dark matter in the present-day cosmos were made with a precision that, for the first time, rivals that of inferences from the early universe by the European Space Agency’s orbiting Planck observatory. The new DES result (the tree, in the above metaphor) is close to “forecasts” made from the Planck measurements of the distant past (the seed), allowing scientists to understand more about the ways the universe has evolved over 14 billion years.

“This result is beyond exciting,” said Scott Dodelson of Fermilab, one of the lead scientists on this result. “For the first time, we’re able to see the current structure of the universe with the same clarity that we can see its infancy, and we can follow the threads from one to the other, confirming many predictions along the way.”

  • Research
  • Astrophysics/Cosmology

"For decades, astronomers have known that supermassive black holes and the stars in their host galaxies grow together," said co-author Joaquin Vieira of the University of Illinois at Urbana-Champaign. "Exactly why they do this is still a mystery. SPT0346-52 is interesting because we have observed an incredible burst of stars forming, and yet found no evidence for a growing supermassive black hole. We would really like to study this galaxy in greater detail and understand what triggered the star formation and how that affects the growth of the black hole."