nongravitational

This, along with nongravitational forces, can result in changes to the date of perihelion.

On the other hand, particles and the three nongravitational forces have yet to be incorporated into a spin network picture.

In the case of comets, nongravitational forces (radiation pressure and gas drag) must be taken into account.

Of course Japanese art was famous for its floating, nongravitational compositions, but these postcards go even further.

"We know nongravitational effects are at work, but we don't know to what extent."

Whether the comet will strike Earth when it returns 134 years from now depends on what astronomers call "nongravitational perturbations."

He said the use of supercomputers could help understand nongravitational forces that could be contributing to galaxy formation.

However, Brian G. Marsden has specialized in calculating such nongravitational forces.

Within the first approach the alleged stress-energy tensor must arise in the standard way from a "reasonable" matter distribution or nongravitational field.

In practice, this notion is pretty clear, especially if you restrict the admissible nongravitational fields to the only one known in 1916, the electromagnetic field.

Nongravitational deviations of gravitational field, arXiv: gr-qc/9411013.

However, the Einstein field equation is not very choosy about what kinds of states of matter or nongravitational fields are admissible in a spacetime model.

After the 2010 perihelion passage, not accounting for nongravitational forces, Hartley 2 is estimated to come back to perihelion around 20 April 2017.

D. K. Yeomans, The intermediate comets and nongravitational effects, Astronomical Journal, vol.

The Weyl tensor represents the part of the gravitational field which can propagate as a gravitational wave through a region containing no matter or nongravitational fields.

Unlike his 1913 scalar theory, it is generally covariant, and it does take into account the field energy-momentum-stress of the electromagnetic field (or any other nongravitational field).

He graduated from the university in 1983, and then he worked until 1988 on his dissertation Nongravitational forces of Comet Halley., under supervision by H.H.Voigt.

Stirred by these thoughts he had built detectors to announce the appearance of any nongravitational forces in the gravity band and had learned that his fears were only too well founded.

These tidal forces are opposed by the internal gravitational forces which tend to make bodies spherical, and by nongravitational intermolecular forces which resist the separation of molecules.

In a conformally flat region, any gravitational effects must be due to the immediate presence of matter or the field energy of some nongravitational field (such as an electromagnetic field).

In the case of lost comets this is especially tricky because of nongravitational forces that can affect their orbits, such as emission of jets of gas from the comet nucleus.

In physics (and mathematics), the Lorentz group is the group of all Lorentz transformations of Minkowski spacetime, the classical setting for all (nongravitational) physical phenomena.

This expansion and recollapse cycle is reminiscent of the expanding and recollapsing FRW cosmological models, and it occurs for a similar reason: the presence of nongravitational mass-energy.

"We know nongravitational effects are at work," said Dr. Brian G. Marsden of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass., "but we don't know to what extent."

It is possible to produce velocity fields by nongravitational processes, but the observed agreement between the amplitudes of perturbations in the CMBR, galaxy and velocity fields supports the gravitational instability theory.