Rest In Peace Dr.Sudashan (1931-2018)

Dr.E C G Sudarshan was an Indian born theoretical physicist and professor at University of Texas.

He is credited for several contribution in physics, out of which most renowned is discovery of "Tachyons". He is well known for is incredible research in field of Optical coherence, sudarshan-glauber representation, V-A theory, open quantum system, Quantum zeno effect. he has also won numerous awards including Padma Bhushan, Padma Vibhushan, TWAS prize, Bose medal, C.V.Raman award and ICTP Dirac Award. He also has notable contributions in relation between West-East, and religion. He challenged the "theory of relativity" by Albert Einstien, for existence of tachyons.

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Understanding String Theory

Hey Guys, I am back with something interesting. "The string theory". We all have ability to perceive the beautiful world around us. But our desire to explore the origin of our world and from what this things are made? to get answer of this question numerous scientists have researched about it. getting deep into it we have discovered smaller and smaller particles breaking the earlier limits. String Theory is also a one attempt to get into the depths of smallest fundamental particles. When we go for the higher documentations for reference or see tough explanation we find it too difficult to understand, I have tried to make it simple and also provided the harder way explanation. So let's start... Lagrangian describes the motion of an object in a plane w.r.t time. Now take lagrangian of motion of two dimensional entity in Field-World "X", so the action that describes the motion of this entity is basically area of World-Sheet using pull-back metric from am...

Lagrangian

Imagine you have a big land piece and you want to build a beautiful mansion there. For this task you have to hire designers, masons, painter and all sort of workers. getting this work done from them is a pretty difficult task. And you suddenly you came across a machine that can do all sort of work alone. This is more or less same in the case of a lagrange The word Lagrangian can refer to a mathematical quantity or a description of a way/method to look at physical events. The Lagrangian method is normally contrasted with the Eulerian method. If you follow the motion of few moving things and devise equations to describe the motion and how the other attributes change along the path, then you are using the Lagrangian method. If you stick to ground and observe these moving things and again devise equations to describe the motion and the changes in the attributes of the moving objects, then you are using the Eulerian method. Like being in a plane and putting rules for its flight, or sitti...

Feyman's Sum-Over-The-Path Approach

The basic idea behind Feynman's sum-over-paths (or sum-over-histories) approach is as follows: Assume that a particle can travel between two points A and B by a - possibly infinite - number of different paths. Each one of these paths will have a certain probability associated with it. In quantum mechanical terms, these probabilities are encoded in the wavefunction that describes the particle, which assigns to each possible path a different probability amplitude ; the square modulus of this amplitude gives the corresponding probability. The crucial point is that these different amplitudes have a wavelike nature, and as they spread through space they interfere with each other, their respective wave patterns either reinforcing or canceling each other out at various points. And if you sum over all the amplitudes of all the different paths, i.e. you sum-over-histories, then the different amplitudes will reinforce or cancel each other in such a way that the only path that survives this...

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