Results 31 to 40 of about 1,881,508 (108)
A locally finite model for gravity [PDF]
, 2008 Matter interacting classically with gravity in 3+1 dimensions usually gives rise to a continuum of degrees of freedom, so that, in any attempt to quantize the theory, ultraviolet divergences are nearly inevitable.
't Hooft, G. +3 more
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Modified Gravity and the origin of inertia [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2009 Abstract Modified gravity theory is known to violate Birkhoff's theorem. We explore a key consequence of this violation, the effect of distant matter in the Universe on the motion of test particles. We find that when a particle is accelerated, a force is experienced that is proportional to the particle's mass and acceleration and acts in
Moffat, J. W., Toth, V. T.
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Thin accretion disk signatures in dynamical Chern-Simons-modified gravity [PDF]
, 2010 A promising extension of general relativity is Chern-Simons (CS)-modified gravity, in which the Einstein-Hilbert action is modified by adding a parity-violating CS term, which couples to gravity via a scalar field.
Lobo, Francisco S N +5 more
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Dynamical masses in modified gravity [PDF]
Physical Review D, 2010 18 pages, 16 figures; submitted to PRD; v2: typos corrected, references added, minor additions (Sec. IID)
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Interpreting Quantum Gravity. [PDF]
, 2005 This is an essay review of two textbooks on quantum gravity by Carlo Rovelli and Claus ...
Dean Rickles, Rickles, Dean
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Mass screening in modified gravity
Classical and Quantum Gravity, 2008 Models of modified gravity introduce extra degrees of freedom, which for consistency with the data, should be suppressed at observable scales. In the models that share properties of massive gravity such a suppression is due to nonlinear interactions: An isolated massive astrophysical object creates a halo of a nonzero curvature around it, shielding its
Gabadadze, Gregory, Iglesias, Alberto
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Modifying gravity at low redshift [PDF]
Journal of Cosmology and Astroparticle Physics, 2010 We consider the growth of cosmological perturbations in modified gravity models where a scalar field mediates a non-universal Yukawa force between different matter species. The growth of the density contrast is altered for scales below the Compton wave-length of the scalar field. As the universe expands, the Compton wave-length varies in time in such a
Brax, Philippe +3 more
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Anomalous radial acceleration of galaxies and clusters supports hyperconical modified gravity
, 2014 General relativity (GR) is the most successful theory of gravity, with great observational support at local scales. However, to keep GR valid at over cosmic scales, some phenomena (such as the flat galaxy rotation curves and the cosmic acceleration ...
Monjo Agut, Robert, Banik, Indranil
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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 +5 more
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Ghost constraints on modified gravity [PDF]
Physics Letters B, 2005 7 pages; v2: typos ...
Nunez, Alvaro, Solganik, Slava
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