<story><title>Gravity is a double copy of other forces</title><url>https://www.quantamagazine.org/how-gravity-is-a-double-copy-of-other-forces-20210504/</url></story><parent_chain></parent_chain><comment><author>tomrod</author><text>So, this is a really cool concept and I look forward to the determination if it is true or testable.&lt;p&gt;I find the &amp;quot;double copy of other forces&amp;quot; verbiage to be difficult to follow. Walking through a formula example would be helpful, and formaluae exist to communicate exactly this kind of clumpy-wumpy-lumpy-timey-wimey awkwardness language clods through in its quest to communicate mathematical structures.</text></comment>
<story><title>Gravity is a double copy of other forces</title><url>https://www.quantamagazine.org/how-gravity-is-a-double-copy-of-other-forces-20210504/</url></story><parent_chain></parent_chain><comment><author>wyager</author><text>&amp;gt; Most theorists assume that gravity actually pushes us around through particles&lt;p&gt;Is this true, and if so, why? The interpretation of gravity as something that warps spacetime very elegantly yields its “gravitational force” via its effect on the action integral, and is easily understood using a path integral style framework. It seems like a particle-based framework would necessarily be a lot more complicated, although maybe it’s necessary for some reason I don’t know.</text></comment>