Results 11 to 20 of about 145,662,408 (160)

The viability of modified gravity theories [PDF]

, 2009
PhDThis thesis studies the viability of classes of modified gravity (MG) theories based on generalisations of the Einstein-Hilbert action. Particular emphasis is given to f(R) theories in both the metric and Palatini formalisms, scalar-tensor theories ...
Uddin, Kotub
core   +2 more sources

Halo modelling in chameleon theories [PDF]

, 2014
We analyse modelling techniques for the large-scale structure formed in scalar-tensor theories of constant Brans-Dicke parameter which match the concordance model background expansion history and produce a chameleon suppression of the gravitational ...
Lombriser, Lucas, Koyama, K., Li, B., Li, Baojiu, Lombriser, L., Koyama, Kazuya   +5 more
core   +1 more source

A Post-Newtonian Gravitomagnetic Effect on the Orbital Motion of a Test Particle around Its Primary Induced by the Spin of a Distant Third Body

Universe, 2019
We study a general relativistic gravitomagnetic 3-body effect induced by the spin angular momentum S X of a rotating mass M X orbited at distance r X by a local gravitationally bound restricted two-body system S of size ...
Lorenzo Iorio
doaj   +1 more source

A HERO for General Relativity

Universe, 2019
HERO (Highly Eccentric Relativity Orbiter) is a space-based mission concept aimed to perform several tests of post-Newtonian gravity around the Earth with a preferably drag-free spacecraft moving along a highly elliptical path fixed in its plane ...
Lorenzo Iorio
doaj   +1 more source

Is There Still Something Left That Gravity Probe B Can Measure?

Universe, 2020
We perform a full analytical and numerical treatment, to the first post-Newtonian (1pN) order, of the general relativistic long-term spin precession of an orbiting gyroscope due to the mass quadrupole moment J 2 of its primary without any ...
Lorenzo Iorio
doaj   +1 more source

Orbital motions as gradiometers for post-Newtonian tidal effects

Frontiers in Astronomy and Space Sciences, 2014
The direct long-term changes occurring in the orbital dynamics of a local gravitationally bound binary system S due to the post-Newtonian tidal acceleration caused by an external massive source are investigated. A class of systems made of a test particle
Lorenzo eIorio
doaj   +1 more source

On Testing Frame-Dragging with LAGEOS and a Recently Announced Geodetic Satellite

Universe, 2018
Recently, Ciufolini and coworkers announced the forthcoming launch of a new cannonball geodetic satellite in 2019. It should be injected in an essentially circular path with the same semimajor axis a of LAGEOS (Laser Geodynamics Satellite), in orbit ...
Lorenzo Iorio
doaj   +1 more source

PSYNDEX Tests Review für ST-EU - SPORTTEST: EUROFIT

, 1988
This is a PSYNDEX Tests Review of ST-EU - SPORTTEST: EUROFIT. PSYNDEX Tests Reviews are written in German and describe and evaluate psychological and educational tests used in the German-speaking countries.
Waschler, Gerhard
core   +1 more source

PSYNDEX Tests Review für CWT - COLOR-WORD-TEST

, 1988
This is a PSYNDEX Tests Review of CWT - COLOR-WORD-TEST. PSYNDEX Tests Reviews are written in German and describe and evaluate psychological and educational tests used in the German-speaking countries.
Böttger, Stefanie
core   +1 more source

On the Euler–Type Gravitomagnetic Orbital Effects in the Field of a Precessing Body

Universe
To the first post–Newtonian order, the gravitational action of mass–energy currents is encoded by the off–diagonal gravitomagnetic components of the spacetime metric tensor.
Lorenzo Iorio
doaj   +1 more source