### scalar-tensor gravity

(GR-like gravity that incorporates a scalar field)

The term **scalar-tensor gravity** indicates a theory of gravity
if it is based upon both a **tensor field** and
a **scalar field**, together. (There can also be theories that
incorporate a **vector field**, a term for one such
being **scalar-tensor-vector gravity**). Newtonian gravity
can be (fully) described with a scalar field, the
gravitational potential: given knowledge of this field throughout
some volume, you can derive the force of gravity at any point within
that volume. General relativity (GR) gravity is very close to that described by
this model scalar field in situations typical for us, but is
ultimately defined by a tensor field: the tensor can be described
by a 4×4 matrix, and includes influences in addition to the
location of the object. The *scalar-tensor gravity* theories of
interest are generally GR, but the effects of gravity also depend
upon a scalar field. A way to look at it is that in place of a
gravitational constant is value that is a function of some
scalar field: the "constant" to use depends upon location. The
term *scalar-tensor gravity* and other terms for theories of gravity
are not necessarily distinct: scalar-tensor gravity can be thought
of as a gravity theory that happens to include this particular
characteristic.

The terms **scalar-tensor gravity** and **scalar-tensor vector gravity**
are sometimes used for specific models among those that fit these
definitions.

(*physics,gravity*)
**Further reading:**

http://en.wikipedia.org/wiki/Scalar-tensor_theory

http://en.wikipedia.org/wiki/Scalar-tensor-vector_gravity

https://ui.adsabs.harvard.edu/abs/2016CQGra..33iLT01N/abstract

https://ui.adsabs.harvard.edu/abs/2019IJMPD..2830012Q/abstract

https://www.einstein-online.info/en/spotlight/scalar-tensor/

https://ui.adsabs.harvard.edu/abs/2003CQGra..20.4503F/abstract

**Referenced by pages:**

f(R) gravity

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