We introduce sparse-ir, a collection of libraries to efficiently handle imaginary-time propagators, central object in finite-temperature quantum many-body calculations. leverage two concepts: firstly, the intermediate representation (IR), an optimal compression propagator with robust a-priori error estimates, and secondly, sparse sampling, near-optimal grids imaginary time frequency from which ...

We investigate the dependence of the carbon and oxygen production in stars on the 3α rate by varying the energy of the 0 + 2-state of 12 C and determine the resulting yields for a selection of low-mass, intermediate-mass, and massive stars. The yields are obtained using modern stellar evolution codes that follow the entire evolution of massive stars, including the supernova explosion, and consi...

When truth con‡icts with e¢ ciency, can verbal communication destroy e¢ ciency? Or are lies or vagueness used to hide inconvenient truths? We consider a sequential 2-player public good game in which the leader has private information about the value of the public good. This value can be low, high, or intermediate, with the latter case giving rise to a prisoners’ dilemma. Without verbal communic...