# What is the difference between Boost and Translation?

1. Apr 10, 2014

### suvendu

As we face in PoincarĂ© Transformation, there are boost and translational symmetry.What is the difference between these two terms?

2. Apr 10, 2014

### Staff: Mentor

A "boost" changes an object's velocity. A "translation" merely changes its position.

3. Apr 10, 2014

### suvendu

Thanks for the reply. So basically boost is a change position with acceleration?

4. Apr 10, 2014

### Filip Larsen

I always read "boost" as short for "Lorentz boost" and simply meaning the Lorentz transformation for a given velocity (speed and direction). For what it is worth, Wikipedia [1] seems to agree with this, with the addition that a boost is a rotation-free Lorentz transformation.

[1] http://en.wikipedia.org/wiki/Lorentz_transformation

5. Apr 10, 2014

### Meir Achuz

No- with constant velocity

6. Apr 10, 2014

### Staff: Mentor

We're simply changing coordinate systems. No acceleration of the object is involved.

In a translation, the initial and final coordinate systems simply have different origins. There is no relative velocity between these two coordinate systems.

In a boost, the final coordinate system has some velocity relative to the initial coordinate system. The origins of the two coordinate systems often coincide at t = 0.

7. Apr 11, 2014

### suvendu

Thank you jtbell,Filip and Meir. :)

8. Dec 4, 2015

### Ajit hira

More generally "boost'" can be a change in acceleration or in force or in power.

9. Dec 4, 2015

### Ajit hira

More generally a "boost" can be a change in acceleration or in force or in power.

10. Dec 4, 2015