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"This image shows a small region (25 x 10 square degrees) of the "E-mode" polarization of the cosmic microwave background (CMB) radiation, as measured by the Atacama Cosmology Telescope (ACT), an experiment in which Prof. Colin Hill plays a leading role"
The XENONnT Time Projection Chamber is the heart of the experiment. It is a cylindrical detector made of polytetrafluoroethylene (PTFE) with a diameter of 134 cm and a height of 148 cm enclosing 5.9 t of liquid xenon with a small gaseous gap at the top
Simulated appearance of a black hole binary (upper panel) at three points along its orbit near conjunction, illustrating a novel way to discover black hole shadows in the integrated light-curve, as dips on top of periodic self-lensing flares (bottom panel).
Astrophysics, Gravitational Wave Physics and Cosmology are closely related fields pertaining to the present status of the universe (Astrophysics) and its early history (Cosmology). Gravity, of course, plays a dominant role in the formation and current state of the universe and, and the observation of gravitational waves by LIGO in 2015 solidified the study of Gravitational Wave Physics. Following this initial detection of gravitational waves, the subsequent observation of the electromagnetic output from neutron star binary collisions has opened the door to multi-messenger astrophysics, where a single astrophysical event is observed in a wide-range of electromagnetic frequencies as well as by its emission of gravitational waves. Astrophysics, the study of black holes, neutron stars, gamma ray bursts, and other novel physical objects and processes in the universe, has seen tremendous improvement in the capabilities of observational techniques in the last 10 to 20 years. New generations of Cosmic Microwave Background (CMB) experiments are planned and being built, which will lead to ever more precise measurements of the CMB and the imprint of the early universe that it carries.
For further details, visit the Columbia Experimental Gravity Group (GECo) and Columbia VERITAS Group pages.