On the Physical Nature of Ly$α$ Transmission Spikes in High Redshift Quasar Spectra

Kavli Affiliate: Nickolay Gnedin | First 5 Authors: Hanjue Zhu, Nickolay Gnedin, Camille Avestruz, , | Summary: We investigate Lyman-alpha (Ly$alpha$) transmission spikes at $5.2 < z < 6.8$ using synthetic quasar spectra from the “Cosmic Reionization On Computers" simulations. We focus on understanding the relationship between these spikes and the properties of the intergalactic […]


Continue.. On the Physical Nature of Ly$α$ Transmission Spikes in High Redshift Quasar Spectra

Spectacular nucleosynthesis from early massive stars

Kavli Affiliate: Alexander P. Ji | First 5 Authors: Alexander P. Ji, Sanjana Curtis, Nicholas Storm, Vedant Chandra, Kevin C. Schlaufman | Summary: Stars formed with initial mass over 50 Msun are very rare today, but they are thought to be more common in the early universe. The fates of those early, metal-poor, massive stars […]


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Multiple Populations and a CH Star Found in the 300S Globular Cluster Stellar Stream

Kavli Affiliate: Alexander P. Ji | First 5 Authors: Sam A. Usman, Alexander P. Ji, Ting S. Li, Andrew B. Pace, Lara R. Cullinane | Summary: Milky Way globular clusters (GCs) display chemical enrichment in a phenomenon called multiple stellar populations (MSPs). While the enrichment mechanism is not fully understood, there is a correlation between […]


Continue.. Multiple Populations and a CH Star Found in the 300S Globular Cluster Stellar Stream

Causal bounds on cosmological angular correlation

Kavli Affiliate: Craig Hogan | First 5 Authors: Craig Hogan, Ohkyung Kwon, Stephan S. Meyer, Nathaniel Selub, Frederick Wehlen | Summary: Causal relationships in conformal geometry are used to analyze angular boundaries of cosmic microwave background (CMB) correlations. It is shown that curvature correlations limited to timelike intervals on world lines that have connected causal […]


Continue.. Causal bounds on cosmological angular correlation

Causal bounds on cosmological angular correlation

Kavli Affiliate: Craig Hogan | First 5 Authors: Craig Hogan, Ohkyung Kwon, Stephan S. Meyer, Nathaniel Selub, Frederick Wehlen | Summary: We formulate a new hypothesis for causal coherence of gravitational quantum fluctuations, and test its predicted constraints on large-scale angular correlations in the cosmic microwave background (CMB). We posit that {it quantum fluctuations generate […]


Continue.. Causal bounds on cosmological angular correlation

Causal bounds on cosmological angular correlation

Kavli Affiliate: Craig Hogan | First 5 Authors: Craig Hogan, Ohkyung Kwon, Stephan S. Meyer, Nathaniel Selub, Frederick Wehlen | Summary: We test the hypothesis that angular correlations of gravitationally-induced temperature anisotropy in the cosmic microwave background (CMB) vanish over a range of large angular separations constrained by causality. Standard conformal geometry is used to […]


Continue.. Causal bounds on cosmological angular correlation

Causal bounds on cosmological angular correlation

Kavli Affiliate: Craig Hogan | First 5 Authors: Craig Hogan, Ohkyung Kwon, Stephan S. Meyer, Nathaniel Selub, Frederick Wehlen | Summary: We test the hypothesis that angular correlations of gravitationally-induced temperature anisotropy in the cosmic microwave background (CMB) vanish over a range of large angular separations constrained by causality. Standard conformal geometry is used to […]


Continue.. Causal bounds on cosmological angular correlation

Nearly-zero large-angle anisotropy of the cosmic microwave background

Kavli Affiliate: Craig Hogan | First 5 Authors: Craig Hogan, Ohkyung Kwon, Stephan S. Meyer, Nathaniel Selub, Frederick Wehlen | Summary: The global isotropy of the universe is analyzed on the scale of the cosmic horizon, using the angular correlation function $C(Theta)$ of cosmic microwave background (CMB) temperature at large angular separation $Theta$. Even-parity correlation […]


Continue.. Nearly-zero large-angle anisotropy of the cosmic microwave background

Nearly-zero large-angle anisotropy of the cosmic microwave background

Kavli Affiliate: Craig Hogan | First 5 Authors: Craig Hogan, Ohkyung Kwon, Stephan S. Meyer, Nathaniel Selub, Frederick Wehlen | Summary: The global isotropy of the universe is analyzed on the scale of the cosmic horizon, using the angular correlation function $C(Theta)$ of cosmic microwave background (CMB) temperature at large angular separation $Theta$. Even-parity correlation […]


Continue.. Nearly-zero large-angle anisotropy of the cosmic microwave background

Nearly-zero large-angle anisotropy of the cosmic microwave background

Kavli Affiliate: Craig Hogan | First 5 Authors: Craig Hogan, Ohkyung Kwon, Stephan S. Meyer, Nathaniel Selub, Frederick Wehlen | Summary: The global isotropy of the universe is analyzed on the scale of the cosmic horizon, using the angular correlation function $C(Theta)$ of cosmic microwave background (CMB) temperature at large angular separation $Theta$. Even-parity correlation […]


Continue.. Nearly-zero large-angle anisotropy of the cosmic microwave background