Kevork N. Abazajian

About

Professor William J. Evans is a faculty member at the Eddleman Quantum Institute at the University of California, Irvine. His research focuses on the synthesis of rare-earth metal compounds, single-molecule magnets, and molecular qubits. As the director of the institute, he contributes to advancing quantum science through interdisciplinary collaboration and education. His work is integral to the institute's concentrated effort on rare-earth metals, which are valuable in exploring the frontiers of quantum science and developing new quantum phenomena.

Research topics

• Physics
• Astrophysics
• Astronomy
• Optics
• Particle physics
• Nuclear physics

Selected publications

• CMB-S4: Forecasting Constraints on Primordial Gravitational Waves

  The Astrophysical Journal · 2022 · 256 citations

  1st authorCorresponding

  Abstract CMB-S4—the next-generation ground-based cosmic microwave background (CMB) experiment—is set to significantly advance the sensitivity of CMB measurements and enhance our understanding of the origin and evolution of the universe. Among the science cases pursued with CMB-S4, the quest for detecting primordial gravitational waves is a central driver of the experimental design. This work details the development of a forecasting framework that includes a power-spectrum-based semianalytic proj…

  PublisherOA PDFDOI

• Strong constraints on thermal relic dark matter from Fermi-LAT observations of the Galactic Center

  Physical review. D/Physical review. D. · 2020 · 77 citations

  1st authorCorresponding

  The extended excess toward the Galactic Center (GC) in gamma rays inferred from Fermi-LAT observations has been interpreted as being due to dark matter (DM) annihilation. Here, we perform new likelihood analyses of the GC and show that, when including templates for the stellar galactic and nuclear bulges, the GC shows no significant detection of a DM annihilation template, even after generous variations in the Galactic diffuse emission models and a wide range of DM halo profiles. We include Gala…

  DOI

• Constraints on Sterile Neutrino Models from Strong Gravitational Lensing, Milky Way Satellites, and the Lyman-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math> Forest

  Physical Review Letters · 2022 · 44 citations

  The nature of dark matter is one of the most important unsolved questions in science. Some darkf matter candidates do not have sufficient nongravitational interactions to be probed in laboratory or accelerator experiments. It is thus important to develop astrophysical probes which can constrain or lead to a discovery of such candidates. We illustrate this using state-of-the-art measurements of strong gravitationally lensed quasars to constrain four of the most popular sterile neutrino models, an…

  PublisherOA PDFDOI

• Early or phantom dark energy, self-interacting, extra, or massive neutrinos, primordial magnetic fields, or a curved universe: An exploration of possible solutions to the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>H</mml:mi><mml:mn>0</mml:mn></mml:msub></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>σ</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:math> problems

  Physical review. D/Physical review. D. · 2022-11-16 · 38 citations

  articleSenior author

  In this paper we explore the existing tensions in the local cosmological expansion rate, ${H}_{0}$, and amplitude of the clustering of the large-scale structure at $8{h}^{\ensuremath{-}1}\text{ }\text{ }\mathrm{Mpc}$, ${\ensuremath{\sigma}}_{8}$, as well as models that claim to alleviate these tensions. We consider seven models: evolving dark energy ($w\mathrm{CDM}$), extra radiation (${N}_{\mathrm{eff}}$), massive neutrinos, curvature, primordial magnetic fields (PMF), self-interacting neutrino…

  PublisherDOI

• Synergy between cosmological and laboratory searches in neutrino physics

  Physics of the Dark Universe · 2023-09-22 · 26 citations

  articleOpen access
  PublisherOA PDFDOI

Recent grants

• CAREER: Cosmological Structure at Small Scales; From the Nature of Dark Matter and its Small-Scale Behavior to Galaxy Formation

  NSF · $160k · 2010–2012

• Frontier Challenges in Neutrino Cosmology, Dark Energy and Dark Matter

  NSF · $75k · 2009–2011

• CAREER: Cosmological Structure at Small Scales; From the Nature of Dark Matter and its Small-Scale Behavior to Galaxy Formation

  NSF · $320k · 2011–2015

Frequent coauthors

• George M. Fuller

  University of California, San Diego

  35 shared

• Steve Blanchet

  École Polytechnique Fédérale de Lausanne

  32 shared

• J. P. Harding

  Los Alamos National Laboratory

  25 shared

• Scott Dodelson

  Carnegie Mellon University

  23 shared

• Shunsaku Horiuchi

  21 shared

• Joshua A. Frieman

  Fermi National Accelerator Laboratory

  20 shared

• Ryan E. Keeley

  20 shared

• Renée Hložek

  University of Toronto

  19 shared

Labs

• Eddleman Quantum InstitutePI

Education

• PhD, Physics

  University of California San Diego

  2001

• B.S., Physics

  University of Houston

  1996

Awards & honors

• Howard Lee awarded Humboldt Research Fellowship

Similar researchers at University of California, Irvine

• Geoffrey W. Abbotth-42
• Munjal Acharyah-36
• Anshu Agrawalh-35