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Creators/Authors contains: "Jinno, Ryusuke"

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  1. ; ; ; ; (, Physical Review Letters)
    We consider first order cosmological phase transitions (PTs) happening at late times below standard model temperatures T PT ≲ GeV . The inherently stochastic nature of bubble nucleation and the finite number of bubbles associated with a late-time PT lead to superhorizon fluctuations in the PT completion time. We compute how such fluctuations eventually source curvature fluctuations with universal properties, independent of the microphysics of the PT dynamics. Using cosmic microwave background (CMB) and large scale structure measurements, we constrain the energy released in a dark-sector PT. For 0.1     eV ≲ T PT ≲ keV this constraint is stronger than both the current bound from additional neutrino species Δ N eff , and in some cases, even CMB-S4 projections. Future measurements of CMB spectral distortions and pulsar timing arrays will also provide competitive sensitivity for keV ≲ T PT ≲ GeV . Published by the American Physical Society2024 
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  2. ; ; ; ; ; ; ; ; ; ; et al (, General Relativity and Gravitation)
    Abstract Detection of a gravitational-wave signal of non-astrophysical origin would be a landmark discovery, potentially providing a significant clue to some of our most basic, big-picture scientific questions about the Universe. In this white paper, we survey the leading early-Universe mechanisms that may produce a detectable signal—including inflation, phase transitions, topological defects, as well as primordial black holes—and highlight the connections to fundamental physics. We review the complementarity with collider searches for new physics, and multimessenger probes of the large-scale structure of the Universe. 
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