Conveners
S7
- Chang Sub Shin (Institute for Basic Science)
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Gongjun Choi (University of Minnesota)26/08/2026, 09:30
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Kylar Greene (Seoul National University)26/08/2026, 10:10
Many cosmological observables are sensitive primarily to ratios of physical scales rather than their absolute values. This motivates the FFAT scaling symmetry, in which correlated changes to the expansion history, primordial fluctuations, and scattering rates can leave much of the CMB phenomenology nearly unchanged while shifting the inferred absolute expansion scale. I will discuss how this...
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Heejoo Kim (KIAS)26/08/2026, 10:50
The pre-inflationary axion dark matter scenario, with its uniform initial misalignment angle, is conventionally expected to yield smooth dark matter without substructure. We explore scenarios of pre-inflationary axion cosmology, where adiabatic temperature perturbations from inflation can source non-trivial axion density fluctuations through both the temperature-dependent QCD axion mass and...
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Gongjun Choi (Institute for Basic Science (IBS))
Extra-dimensional QCD axion is well motivated by string compactifications and enjoys enhanced protection against quality-violating effects. If present during inflation, however, its quantum fluctuations generate isocurvature perturbations that strongly constrain the inflationary scale. We propose a dynamical suppression mechanism in warped five-dimensional models, where a radion-inflaton...
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