scholarly journals Reining in Alternative Gravity

Physics ◽  
2017 ◽  
Vol 10 ◽  
Author(s):  
Fabian Schmidt
Keyword(s):  
Alternative Gravity

scholarly journals Position and frequency shifts induced by massive modes of the gravitational wave background in alternative gravity

2009 ◽  
Vol 79 (10) ◽  
Author(s):  
Stefano Bellucci ◽  
Salvatore Capozziello ◽  
Mariafelicia De Laurentis ◽  
Valerio Faraoni
Keyword(s):  
Gravitational Wave ◽  
Frequency Shifts ◽  
Gravitational Wave Background ◽  
Alternative Gravity

CAN TORSION BE TREATED AS JUST ANOTHER TENSOR FIELD?

2012 ◽  
Vol 07 ◽  
pp. 158-164 ◽  
Author(s):  
JAMES M. NESTER ◽  
CHIH-HUNG WANG
Keyword(s):  
Gauge Theory ◽  
Tensor Field ◽  
Affine Connection ◽  
Cartan Geometry ◽  
Civita Connection ◽  
Levi Civita Connection ◽  
Alternative Gravity Theories ◽  
Theory Of Gravity ◽  
Gauge Theory Of Gravity ◽  
Alternative Gravity

Many alternative gravity theories use an independent connection which leads to torsion in addition to curvature. Some have argued that there is no physical need to use such connections, that one can always use the Levi-Civita connection and just treat torsion as another tensor field. We explore this issue here in the context of the Poincaré Gauge theory of gravity, which is usually formulated in terms of an affine connection for a Riemann-Cartan geometry (torsion and curvature). We compare the equations obtained by taking as the independent dynamical variables: (i) the orthonormal coframe and the connection and (ii) the orthonormal coframe and the torsion (contortion), and we also consider the coupling to a source. From this analysis we conclude that, at least for this class of theories, torsion should not be considered as just another tensor field.

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.

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