5 papers
Probing Confining Dark Sectors with Cosmological Perturbations
Daven Wei Ren Ho, Ameen Ismail, Yuhsin Tsai
Dark matter may emerge as a composite state of a dark sector which confines in a strongly first-order phase transition (PT). To avoid structure formation constraints on warm dark m…
Observable CMB B-modes from Cosmological Phase Transitions
Kylar Greene, Aurora Ireland, Gordan Krnjaic +1
A B-mode polarization signal in the cosmic microwave background (CMB) is widely regarded as smoking gun evidence for gravitational waves produced during inflation. Here, we demonst…
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…
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…
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…