Demonstration of resolving power $λ/Δλ> 10,000$ for a space-based x-ray transmission grating spectrometer

Posted by klaurent MIT

Kavli Affiliate: Mark Schattenburg | Summary:We present measurements of the resolving power of a soft x-ray spectrometer consisting of 200 nm-period lightweight, alignment-insensitive critical-angle transmission (CAT) gratings and a lightweight slumped-glass Wolter-I focusing mirror pair. We measure and model contributions from source, mirrors, detector pixel size, and grating period variation to the natural line width […]


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Shift Symmetries in (Anti) de Sitter Space

Posted by klaurent Chicago

Kavli Affiliate: Austin Joyce | Summary:We construct a class of extended shift symmetries for fields of all integer spins in de Sitter (dS) and anti-de Sitter (AdS) space. These generalize the shift symmetry, galileon symmetry, and special galileon symmetry of massless scalars in flat space to all symmetric tensor fields in (A)dS space. These symmetries […]


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