Results 71 to 80 of about 322,153 (182)

Gravitational decoherence [PDF]

open access: yesClassical and Quantum Gravity, 2017
We discuss effects of loss of coherence in low energy quantum systems caused by or related to gravitation, referred to as gravitational decoherence. These effects, resulting from random metric fluctuations, for instance, promise to be accessible by relatively inexpensive table-top experiments, way before the scales where true quantum gravity effects ...
Angelo Bassi   +2 more
openaire   +5 more sources

Gravitational waves [PDF]

open access: yesNuclear Physics B - Proceedings Supplements, 1994
In the last few years there have been a number of significant developments in research towards the detection of gravitational radiation from astronomical objects. The construction of 3 large-scale (3- or 4-km) interferometric detectors has been funded; new high-sensitivity bars are under construction; there is a serious proposal using two ...
openaire   +4 more sources

Gravitational helioseismology? [PDF]

open access: yesPhysical Review D, 1996
The magnitudes of the external gravitational perturbations associated with the normal modes of the Sun are evaluated to determine whether these solar oscillations could be observed with the proposed Laser Interferometer Space Antenna (LISA), a network of satellites designed to detect gravitational radiation.
Cutler, Curt, Lindblom, Lee
openaire   +3 more sources

Gravitational physics

open access: yesPhysics World, 1996
Gravity is truly universal. It is the force that pulls us to the Earth, that keeps the planets and moons in their orbits, and that causes the tides on the Earth to ebb and flow. It even keeps the Sun shining. Yet on a laboratory scale gravity is extremely weak.
Schäfer, G., Schutz, B.
openaire   +2 more sources

Teoria quântica da gravitação: cordas e teoria M

open access: yesRevista Brasileira de Ensino de Física
Discutimos aqui a junção da relatividade geral e da mecânica quântica como necessidade tanto teórica quanto experimental da Física, e suas conseqüências na compreensão do Universo, de seu início e sua evolução.
Elcio Abdalla
doaj   +1 more source

Gravitational lensing [PDF]

open access: yesClassical and Quantum Gravity, 2010
Invited review article to appear in Classical and Quantum Gravity, 85 pages, 15 ...
openaire   +2 more sources

First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole

open access: yesThe Astrophysical Journal Letters, 2019
We present measurements of the properties of the central radio source in M87 using Event Horizon Telescope data obtained during the 2017 campaign. We develop and fit geometric crescent models (asymmetric rings with interior brightness depressions) using ...
The Event Horizon Telescope Collaboration   +214 more
doaj   +1 more source

Satellite Galaxy Velocity Dispersions in the SDSS and Modified Gravity Models

open access: yesGalaxies, 2014
The Sloan Digital Sky Survey (SDSS) provides data on several hundred thousand galaxies. The precise location of these galaxies in the sky, along with information about their luminosities and line-of-sight (Doppler) velocities, allows one to construct a ...
John W. Moffat, Viktor T. Toth
doaj   +1 more source

The Conservative Field of Coupled Newton–Coulomb Sources: Component Coupling Constants, Mass ⇌ Charge Cross-Forces, and Radiation from Reissner–Nordström Black Hole Mergers

open access: yesAxioms
We investigate a combined conservative field, in which classical gravitational and electrostatic sources also exhibit mutual interactions. Hitherto neglected, the coupling between mass and charge may be necessary for constructing a unified conservative ...
Dimitris M. Christodoulou   +2 more
doaj   +1 more source

First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole

open access: yesThe Astrophysical Journal Letters, 2019
When surrounded by a transparent emission region, black holes are expected to reveal a dark shadow caused by gravitational light bending and photon capture at the event horizon.
The Event Horizon Telescope Collaboration   +348 more
doaj   +1 more source

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