97 citations · 319 across the 9 of their papers we have counts for
9 papers
Spacetime Dynamics of a Higgs Vacuum Instability During Inflation
William E. East, John Kearney, Bibhushan Shakya +2
A remarkable prediction of the Standard Model is that, in the absence of corrections lifting the energy density, the Higgs potential becomes negative at large field values. If the…
Are Crab Nanoshots Schwinger Sparks?
Albert Stebbins, Hojin Yoo
The highest brightness temperature ever observed are from "nanoshots" from the Crab pulsar which we argue could be the signature of bursts of vacuum pair production. If s…
Is a Higgs Vacuum Instability Fatal for High-Scale Inflation?
John Kearney, Hojin Yoo, Kathryn M. Zurek
We study the inflationary evolution of a scalar field with an unstable potential for the case where the Hubble parameter during inflation is larger than the instability sca…
Elementary Theorems Regarding Blue Isocurvature Perturbations
Daniel J. H. Chung, Hojin Yoo
Blue CDM-photon isocurvature perturbations are attractive in terms of observability and may be typical from the perspective of generic mass relations in supergravity. We present an…
Fermionic Isocurvature Perturbations
Daniel J. H. Chung, Hojin Yoo, Peng Zhou
Isocurvature perturbations in the inflationary literature typically involve quantum fluctuations of bosonic field degrees of freedom. In this work, we consider isocurvature perturb…
Quadratic Isocurvature Cross-Correlation, Ward Identity, and Dark Matter
Daniel J. H. Chung, Hojin Yoo, Peng Zhou
Sources of isocurvature perturbations and large non-Gaussianities include field degrees of freedom whose vacuum expectation values are smaller than the expansion rate of inflation.…
Isocurvature Constraints and Gravitational Ward Identity
Hojin Yoo
Axions and WIMPZILLAs are well-motivated dark matter candidates with interesting cos- mological implications, such as isocurvature perturbations and non-Gaussianities. How- ever, t…
Isocurvature Perturbations and Non-Gaussianity of Gravitationally Produced Nonthermal Dark Matter
Daniel J. H. Chung, Hojin Yoo
Gravitational particle production naturally occurs during the transition from the inflationary phase to the non-inflationary phase. If the particles are stable and very weakly inte…
Gravitational Fermion Production in Inflationary Cosmology
Daniel J. H. Chung, Lisa L. Everett, Hojin Yoo +1
We revisit the gravitational production of massive Dirac fermions in inflationary cosmology with a focus on clarifying the analytic computation of the particle number density in bo…