# Curved Space-Time question.

1. May 27, 2005

### Enos

What equation do you use to find the curvature a body of mass creates? I know the answer for the suns mass is 1.75 arc-seconds. So if I took the g of the sun and divided it by the g of the earth and divided 1.75 arc-seconds by the ratio of the g difference would I get the earth's curvature. Which is about 0.0626 arc-seconds from what I'm doing.

If I knew the formula that is used to get the answer for the sun things would be so much easier. Thanks for any help.

2. May 27, 2005

### dextercioby

You're mixing them up.That 1.75 arcseconds is the angle of deflection of a ray of light in passing through Sun's Schwarzschild field.

You can compute for Earth,simply inserting the appropriate constants into the deflection formula.It's approximately 3300 times less.

Daniel.

3. May 28, 2005

### Enos

Can you share the appropriate constants and the deflection formula? :)

4. May 28, 2005

### dextercioby

Sure.

$$\Delta\phi=4\frac{G m_{source}}{c^{2}R_{rource}}$$

Source:M.Carmeli,"Group Theory and General Relativity",McGraw-Hill,1977,p.155.

Daniel.

5. May 30, 2005

### Enos

Thank you. :)