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  2. Two-body problem in general relativity - Wikipedia

    en.wikipedia.org/wiki/Two-body_problem_in...

    As the two bodies orbit each other, they will emit gravitational radiation; this causes them to lose energy and angular momentum gradually, as illustrated by the binary pulsar PSR B1913+16. For binary black holes , the numerical solution of the two-body problem was achieved after four decades of research in 2005 when three groups devised ...

  3. Angular momentum - Wikipedia

    en.wikipedia.org/wiki/Angular_momentum

    The angular momentum of m is proportional to the perpendicular component v ⊥ of the velocity, or equivalently, to the perpendicular distance r ⊥ from the origin. Angular momentum is a vector quantity (more precisely, a pseudovector) that represents the product of a body's rotational inertia and rotational velocity (in radians/sec) about a ...

  4. Angular momentum problem - Wikipedia

    en.wikipedia.org/wiki/Angular_momentum_problem

    The angular momentum problem is a problem in astrophysics identified by Leon Mestel in 1965. [ 1 ] It was found that the angular momentum of a protoplanetary disk is misappropriated when compared to models during stellar birth.

  5. Euler's equations (rigid body dynamics) - Wikipedia

    en.wikipedia.org/wiki/Euler's_equations_(rigid...

    Also in some frames not tied to the body can it be possible to obtain such simple (diagonal tensor) equations for the rate of change of the angular momentum. Then ω must be the angular velocity for rotation of that frames axes instead of the rotation of the body. It is however still required that the chosen axes are still principal axes of ...

  6. Relativistic angular momentum - Wikipedia

    en.wikipedia.org/wiki/Relativistic_angular_momentum

    For reference and background, two closely related forms of angular momentum are given. In classical mechanics, the orbital angular momentum of a particle with instantaneous three-dimensional position vector x = (x, y, z) and momentum vector p = (p x, p y, p z), is defined as the axial vector = which has three components, that are systematically given by cyclic permutations of Cartesian ...

  7. Falling cat problem - Wikipedia

    en.wikipedia.org/wiki/Falling_cat_problem

    The falling cat problem has elicited interest from scientists including George Gabriel Stokes, James Clerk Maxwell, and Étienne-Jules Marey.In a letter to his wife, Katherine Mary Clerk Maxwell, Maxwell wrote, "There is a tradition in Trinity that when I was here I discovered a method of throwing a cat so as not to light on its feet, and that I used to throw cats out of windows.

  8. Two-body problem - Wikipedia

    en.wikipedia.org/wiki/Two-body_problem

    where μ is the reduced mass and r is the relative position r 2 − r 1 (with these written taking the center of mass as the origin, and thus both parallel to r) the rate of change of the angular momentum L equals the net torque N = = ˙ ˙ + ¨ , and using the property of the vector cross product that v × w = 0 for any vectors v and w ...

  9. Three-body problem - Wikipedia

    en.wikipedia.org/wiki/Three-body_problem

    In 2013, physicists Milovan Šuvakov and Veljko Dmitrašinović at the Institute of Physics in Belgrade discovered 13 new families of solutions for the equal-mass zero-angular-momentum three-body problem. [8] [14] In 2015, physicist Ana Hudomal discovered 14 new families of solutions for the equal-mass zero-angular-momentum three-body problem. [19]