Relationship Between Strings and Spacetime Geometry

If string theory is gravity theory, how is it compared with Einstein's gravity theory? What is the relationship between string and spatiotemporal geometry? The easiest way to imagine a string and gravity is that a single string moves in d-dimensional space with flat time and space. This means that the string passes through the space and time passes. A string is a one-dimensional object. In other words, if you want to move along a string, you can only advance or rewind in the direction of the string without moving the string horizontally or vertically.

One of the main criticisms against string theory since early years was that it had nothing to do with the background. In string theory it is often necessary to specify a fixed reference geometry for space and time and all other possible geometries are described as perturbations of fixed geometry. Lis Molin, a physicist at the theoretical physics laboratory, claims that this is the main weak point of string theory as quantum gravity theory in his book "The Trouble of Physics". It contains important insights.

In general relativity, gravity is a virtual force that occurs when time and space deviates from flat geometry. As an extension, Kaluza-Klein's theoretical string theory classifies electromagnetism and other basic forces into different curvatures of different scales. In other words, all power is fictitious. Torque is a rotational equivalent of force as well as the angle is the rotation of the position and the angular velocity of the velocity is the same as the angular momentum of the momentum. As a result of Newton's first law of motion there is a moment of inertia that ensures that all objects maintain their angular momentum unless it receives unbalanced torque. Similarly, you can use Newton's second law of motion to derive a similar equation for the instantaneous angular acceleration of a rigid body.