Nesting Doll Stars Proposed as Solution to General Relativity
Gravastars within gravastars would be a mind-blowing answer to a conundrum established by Einstein.
Source: gizmodo.com
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Why physicists are rethinking the route to a theory of everything
Physicists’ search for a theory that explains all reality in one framework appeared to have stalled. But now they are reinvigorating the hunt by exploring a wild landscape of abstract geometry
Source: newscientist.com
What is time? An astronomer explains
What is time? Sten Odenwald explains how recent theories about the quantum nature of gravity provide some unique and fantastic answers.
Source: astronomy.com
Weekly Climate and Energy News Roundup #583 • Watts Up With That?
“For every complex problem there is an answer that is clear, simple, and wrong.” – H.L. Menchen
Source: wattsupwiththat.com
Exploring large-scale entanglement in quantum simulation
Entanglement is a distinguishing feature of quantum many-body systems, and uncovering the entanglement structure for large particle numbers in quantum simulation experiments is a fundamental challenge in quantum information science1. Here we perform experimental investigations of entanglement on the basis of the entanglement Hamiltonian (EH)2 as an effective description of the reduced density operator for large subsystems. We prepare ground and excited states of a one-dimensional XXZ Heisenberg chain on a 51-ion programmable quantum simulator3 and perform sample-efficient ‘learn...
Source: nature.com