1) Is it always a given that the spacetime curvature will be flat in a region in which there is no mass?(adsbygoogle = window.adsbygoogle || []).push({});

2) Therefore is the curvature directly dependent on the mass in a particular region?

3) Also, what exactly is included in the term "mass"?

4) If there are no matter fields to curve space time, would there be no concept of a gravitational force?

Thanks.

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# Re: Spacetime curvature

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