## What is a Twistor in physics?

In theoretical physics, twistor theory was proposed by Roger Penrose in 1967 as a possible path to quantum gravity and has evolved into a branch of theoretical and mathematical physics. Penrose proposed that twistor space should be the basic arena for physics from which space-time itself should emerge.

**Is string theory solvable?**

One of the challenges of string theory is that the full theory does not have a satisfactory definition in all circumstances. Another issue is that the theory is thought to describe an enormous landscape of possible universes, which has complicated efforts to develop theories of particle physics based on string theory.

### How does string theory explain gravity?

Many scientists believe in string theory because of its mathematical beauty. The theory explains gravity via a particular vibrating string whose properties correspond to that of the hypothetical graviton, a quantum mechanical particle that would carry the gravitational force.

**What is string theory in layman’s terms?**

In short, string theory refers to the mathematical models which seek to find a common explanation for the four main forces seen in nature. These forces are the electromagnetic force, the strong and weak nuclear force and gravity.

## Why is loop quantum gravity wrong?

In gravity the loops themselves are not in space because there is no space. The loops are space because they are the quantum excitations of the gravitational field, which is the physical space. It therefore makes no sense to think of a loop being displaced by a small amount in space.

**Why is it called M theory?**

Origin of the term In the absence of an understanding of the true meaning and structure of M-theory, Witten has suggested that the M should stand for “magic”, “mystery”, or “membrane” according to taste, and the true meaning of the title should be decided when a more fundamental formulation of the theory is known.

### What is wrong with string theory?

The internal problems of the theory are even more serious after another decade of research. These include the complexity, ugliness and lack of explanatory power of models designed to connect string theory with known phenomena, as well as the continuing failure to come up with a consistent formulation of the theory.