Events Archive

Dark Cosmos - New precision cosmological constraints from CMB lensing with the Atacama Cosmology Telescope|Matthew Madhavacheril|Joseph Henry [email protected]
Tue, Apr 25, 2023, 4:00 pm5:00 pm

The Atacama Cosmology Telescope is a ground-based CMB survey that has mapped half the millimeter sky at significantly higher resolution and sensitivity than the Planck satellite. I will present new ACT results from a 9400 sq.deg. gravitational lensing mass map, including constraints on the amplitude of matter fluctuations as well as the Hubble…

Physics faculty, post docs, grads
Dark Cosmos - Enhancing the early universe from rotating axion field|Dr Nicolas Fernandez|April 11 @4PM
Tue, Apr 11, 2023, 4:00 pm5:30 pm

In this talk, I present a novel scenario in which the unexplored cosmological evolution of the axion field, specifically a rotation in field space, gives rise to the observed dark matter abundance, baryon asymmetry of the Universe, and gravitational waves signatures. This rotation of the axion field provides a natural origin for an era of…

Physic faculty, post docs, grads
Dark Cosmos - Molecules For Dark Matter Detection|Ben Lillard - UO, Joseph Henry Rm @4PM
Tue, Mar 28, 2023, 4:00 pm5:00 pm

Organic scintillators are a promising avenue for the direct detection of sub-GeV dark matter (DM). With eV-scale excitation energies that rival the sensitivity of semiconductor targets, they can be produced in bulk and purified relatively inexpensively. A low-background kilogram-size scintillator target could achieve world-leading sensitivity…

Faculty, Postdocs, graduate students
Dark Cosmos | Directly Detecting Light Dark Matter| Robert McGehee (University of Michigan)
Tue, Feb 28, 2023, 4:00 pm5:00 pm

While the experimental program to detect ever lighter dark matter is proceeding full steam ahead, the theory of such light, detectable dark matter is at a crossroads. I will detail two examples of sub-GeV hadrophilic dark matter models which these future direct detection endeavors may discover while highlighting the serious challenges model…

Faculty, Postdocs, graduate students
Dark Cosmos |High-precision measurement of the W boson mass with the CDF II detector | Bo Jayatilaka (Fermilab)
Tue, Feb 14, 2023, 4:00 pm5:00 pm

The mass of the W boson, a mediator of the weak force between elementary particles, is tightly constrained by the symmetries of the standard model of particle physics. The Higgs boson was the last missing component of the model. After observation of the Higgs boson, a measurement of the W boson mass provides a stringent test…

Faculty, Postdocs, graduate students
Dark Cosmos - Count your halos
Tue, Jan 31, 2023, 4:00 pm5:00 pm

One of the strongest predictions of the standard cold dark matter paradigm is the hierarchy of structure down to Earth-mass scales.  However, individual self-bound clumps of dark matter--"halos"--are difficult to detect directly.  Instead, we use galaxies as lampposts for halos.  By counting galaxies, we can measure the…

Faculty, Postdocs, graduate students
Harmonic Analysis of the Stochastic Gravitational Wave Background - Kim Boddy - University of Texas
Tue, Dec 13, 2022, 4:00 pm5:30 pm

Abstract: A stochastic gravitational wave background (SGWB) is expected to be generated from a population of unresolved sources and potentially from early Universe processes. In the nHz band, supermassive black hole binaries generate a SGWB, and there have been hints that a detection of the SGWB by pulsar timing arrays (PTAs) may be on the…

Faculty, post docs, grads