3 papers
hep-ph2026
Cosmological and Astrophysical Constraints on Late First-Order Phase Transitions
Kylar Greene, Daven Wei Ren Ho, Soubhik Kumar +1
First-order cosmological phase transitions (PT) can take place in a dark sector at relatively late times between the big-bang nucleosynthesis and recombination epochs. Because bubb…
astro-ph.CO2026
A Universal CMB -Mode Spectrum from Early Causal Tensor Sources
Kylar Greene, Aurora Ireland, Gordan Krnjaic +1
Many early universe scenarios predict post-inflationary tensor perturbations from causality-limited, sub-horizon sources. While the microphysical details may differ, as long as the…
astro-ph.CO2026
First constraints on causal sources of primordial gravitational waves from BICEP/Keck, SPTpol, SPT-3G, Planck and WMAP -mode data
Jessica A. Zebrowski, Aurora Ireland, Christian L. Reichardt +4
Non-inflationary sources of gravitational waves in the early Universe generically predict causality-limited tensor power spectra at low frequencies. We report the first-ever constr…