## f(R) gravity

In f(R) **gravity** , one seeks to generalize the Lagrangian of the Einstein-Hilbert action : to where , is the determinant of the metric tensor and is some function of the Ricci Curvature . [ edit ] Metric f(R) **Gravity** [ edit ] Derivation of field equations In metric f(R) **gravity**

**wikipedia.org**| 2011/7/10 1:13:20

## Gravity-A

According to Robert Lazar , when the so called "Sport Model" UFO disc is near another source of **gravity** , like Earth , the **Gravity** A wave, which propagates outward from the disc, is phase shifted into the **Gravity** B wave, which propagates outward from the Earth, and this creates lift. The

**wikipedia.org**| 2010/9/24 17:54:50

## Anti-gravity

In Newton's law of universal gravitation , **gravity** was an external force transmitted by unknown means. In the 20th century, Newton's model was replaced by general relativity where **gravity** is not a force but the result of the geometry of space. Under general relativity, anti **gravity** is impossible

**wikipedia.org**| 2011/9/13 13:46:56

## Gauss' law for gravity

In physics , Gauss's law for **gravity** , also known as Gauss's flux theorem for **gravity** , is a law of physics which is essentially equivalent to Newton's law of universal gravitation . Although Gauss's law for **gravity** is physically equivalent to Newton's law, there are many situations where

**wikipedia.org**| 2011/9/20 5:12:20

## Gravity current

In fluid dynamics , a **gravity** current is a primarily horizontal flow in a gravitational field that is driven by a density difference, hence **gravity** currents also sometimes being referred to as "density currents". Typically, the density difference is small enough for the Boussinesq approximation

**wikipedia.org**| 2011/4/28 5:59:42

## Speed of gravity

In the context of classical theories of gravitation , the speed of **gravity** is the speed at which changes in a gravitational field propagate. This is the speed at which a change in the distribution of energy and momentum of matter results in subsequent alteration, at a distance, of the

**wikipedia.org**| 2011/8/10 6:30:43

## Standard gravity

Although the symbol g is sometimes incorrectly used for standard **gravity** , g (without a suffix) strictly means the local acceleration due to local **gravity** and centrifugal acceleration, which varies depending on one's position on Earth (see Earth's **gravity** ). The symbol g should not be

**wikipedia.org**| 2011/8/5 20:01:01