scholarly journals What is the Price of Abandoning Dark Matter? Cosmological Constraints on Alternative Gravity Theories

2020 ◽  
Vol 125 (21) ◽  
Author(s):  
Kris Pardo ◽  
David N. Spergel
Keyword(s):  
Dark Matter ◽  
Cosmological Constraints ◽  
Alternative Gravity Theories ◽  
Gravity Theories ◽  
Alternative Gravity

scholarly journals NOTE ON NON-METRIC GRAVITY

2007 ◽  
Vol 22 (22) ◽  
pp. 1643-1649 ◽  
Author(s):  
INGEMAR BENGTSSON
Keyword(s):  
Degrees Of Freedom ◽  
Hamiltonian Formulation ◽  
Four Dimensions ◽  
Alternative Gravity Theories ◽  
Gravity Theories ◽  
Alternative Gravity

We discuss a class of alternative gravity theories that are specific to four dimensions, do not introduce new degrees of freedom, and come with a physical motivation. In particular we sketch their Hamiltonian formulation and their relation with some earlier constructions.

NON-RIEMANNIAN THEORIES OF GRAVITY AND LUNAR AND SATELLITE LASER RANGING

1992 ◽  
Vol 07 (04) ◽  
pp. 843-852 ◽  
Author(s):  
IGNAZIO CIUFOLINI ◽  
RICHARD MATZNER
Keyword(s):  
General Relativity ◽  
Riemannian Manifold ◽  
Satellite Laser Ranging ◽  
Laser Ranging ◽  
Riemannian Spacetime ◽  
Theories Of Gravity ◽  
Alternative Gravity Theories ◽  
Gravity Theories ◽  
Einstein’S General Relativity ◽  
Alternative Gravity

Theories of gravity with a non-Riemannian manifold have been studied since the advent of Einstein's general relativity. In this paper, after an introduction on theories of gravity with a non-Riemannian spacetime and in particular on the nonsymmetric Moffat theory, we briefly describe the techniques of lunar and satellite laser ranging. Among the various applications of lunar and satellite laser ranging are several important measurements and tests of Einstein's general relativity as well as constraints on some alternative gravity theories. In particular, lunar and satellite laser ranging put strong validity limits on the 1983 nonsymmetric Moffat theory.

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