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2022-01-21 13:10:23 Study finds that black hole inner horizons can be charged or discharged
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2022-01-20 14:53:13 For the first time, scientists rigorously calculate three-particle scattering from theory
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2022-01-20 14:53:13 A statistical solution to the chaotic, non-hierarchical three-body problem
- Nicholas C. Stone and Nathan W. C. Leigh
- Abstract :
The three-body problem is arguably the oldest open question in astrophysics and has resisted a general analytic solution for centuries. Various implementations of perturbation theory provide solutions in portions of parameter space, but only where hierarchies of masses or separations exist. Numerical integrations show that bound, non-hierarchical triple systems of Newtonian point particles will almost always disintegrate into a single escaping star and a stable bound binary, but the chaotic nature of the three-body problem prevents the derivation of tractable6 analytic formulae that deterministically map initial conditions to final outcomes. Chaos, however, also motivates the assumption of ergodicity, implying that the distribution of outcomes is uniform across the accessible phase volume...
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2022-01-20 14:53:13 Solving the Three Body Problem
Physics - and arguably all of science changed forever in 1687 when Isaac Newton published his Principia. Within it were equations of motion and gravity that transformed our erratic-seeming cosmos into a perfectly tuned machine of clockwork predictability. Given the current positions and velocities of the bodies of the solar system, Newton’s equations could be used in principle be used to calculate their locations at any distant time, future or past. I say “in principle” because the reality isn’t so simple. Despite the beauty of Newton’s equations, they lead to a simple solution for planetary motion in only one case - when two and only two bodies orbit each other sans any other gravitational influence in the universe. Add just one more body and in most cases all motion becomes fundamentally chaotic - there exists no simple solution. This is the three-body problem, and we’ve been trying to solve it for over 300 years.
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2022-01-20 14:53:13 Hubble finds a black hole igniting star formation in a dwarf galaxy
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2022-01-20 14:53:13 ‘Strange history’ of photons challenges our understanding of quantum interactions
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2022-01-17 18:29:56 Arase satellite uncovers coupling between plasma waves and charged particles in Geospace
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2022-01-17 18:29:55 The quantum field theory on which the everyday world supervenes
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2022-01-17 18:29:55 Hubble views a tranquil galaxy with an explosive past
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2022-01-17 18:29:55 Advances in theoretical modeling of atomic nuclei
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