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## What is curved spacetime?

The curvature of spacetime **influences the motion of massive bodies within it**; in turn, as massive bodies move in spacetime, the curvature changes and the geometry of spacetime is in constant evolution. Gravity then provides a description of the dynamic interaction between matter and spacetime. View »

## How does matter curve space time?

**When a smaller mass passes near a larger mass, it curves toward the larger mass because spacetime itself is curved toward the larger mass**. The smaller mass is not “attracted” to the larger mass by any force. The smaller mass simply follows the structure of curved spacetime near the larger mass.

## Are gravitons proven?

As Fermilab senior physicist Don Lincoln wrote in a post: “**Gravitons are a theoretically reputable idea, but are not proven**. So if you hear someone say that ‘gravitons are particles that generate the gravitational force,’ keep in mind that this is a reasonable statement, but by no means is it universally accepted.

## What is bending space called?

This process is called **compactification**.

## What’s spacetime made of?

In physics, spacetime is **any mathematical model which fuses the three dimensions of space and the one dimension of time into a single four-dimensional manifold**. Spacetime diagrams can be used to visualize relativistic effects, such as why different observers perceive differently where and when events occur.

## Why does energy bend space-time?

**Since matter carries energy (via Einstein’s famous relation that energy is mass times the speed of light squared), such objects will have a gravitational field** and so they will distort space-time.

## Can gravitons travel faster than light?

Even if gravity crosses the event horizon, **it can not be said to travel faster than light**.

## Is the Higgs boson a graviton?

The graviton is the carrier of the gravitional force if you describe that force by a quantum field theory. Whether gravitons are a useful way to describe quantum gravity is not clear. However, what is clear is that **the graviton and Higgs boson are entirely unrelated**.

## Why can’t quantum mechanics explain gravity?

Quantum mechanics suggests everything is made of quanta, or packets of energy, that can behave like both a particle and a wave—for instance, quanta of light are called photons. Detecting gravitons, the hypothetical quanta of gravity, would prove gravity is quantum. The problem is that **gravity is extraordinarily weak**.

## Can space/time exist without matter?

Special & General Relativity Questions and Answers

General relativity tells us that what we call space is just another feature of the gravitational field of the universe, so **space and space-time can and do not exist apart from the matter and energy that creates the gravitational field.**

## Is space-time a matter?

Space in our Universe is three dimensional, and when you combine it with time, you get a four dimensional quantity. When it comes to the notion of spacetime curvature, this is what General Relativity refers to. But **under no circumstances should you conceive of space as though it’s a material, physical thing; it isn’t.**

## Is spacetime a fluid?

(Inside Science) — Spacetime is a somewhat slippery concept — Einstein described the universe in four dimensions, combining the well-known three dimensions of space with time. **Physicists now suggest that spacetime may itself be a fluid**, a very slippery type known as a superfluid.

## Is spacetime a solid?

Some of these models predict that spacetime at the Planck scale (10-33cm) is no longer continuous – as held by classical physics – but **discrete in nature**. Just like the solids or fluids we come into contact with every day, which can be seen as made up of atoms and molecules when observed at sufficient resolution.

## Does space behave like a fluid?

**Physicists have gathered evidence that space-time can behave like a fluid**. Mathematical evidence, that is, but still evidence. If this relation isn’t a coincidence, then space-time – like a fluid – may have a substructure. We shouldn’t speak of space and time as if the two were distant cousins.