Title: Classical Mechanics vs Quantum Mechanics - Clear IAS
Headings: Classical Mechanics vs Quantum Mechanics
Classical Mechanics vs Quantum Mechanics
Classical Mechanics for Macroscopic Objects
Quantum Mechanics for Micro (and macro) scopic Objects
Standard Particle Model of Quantum Mechanics
Beyond Standard Particle Model
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Quantum Field Theory (QFT)
Non Quantum Relativistic Mechanics vs Relativistic Quantum Mechanics vs Quantum Gravity
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Content: When both quantum mechanics and classical mechanics cannot apply, such as at the quantum level with many degrees of freedom, Quantum Field Theory (QFT) becomes applicable. QFT deals with small distances and large speeds with many degrees of freedom as well as the possibility of any change in the number of particles throughout the interaction. The scheme of Quantum Field Theory is that fermions interact by exchanging bosons. We will see more about Fermions and Bosons later. To deal with large degrees of freedom at the macroscopic level, statistical mechanics becomes valid. Statistical mechanics explores the large number of particles and their interactions as a whole in everyday life. Statistical mechanics is mainly used in thermodynamics. Non Quantum Relativistic Mechanics vs Relativistic Quantum Mechanics vs Quantum Gravity
In physics, relativistic mechanics refers to mechanics compatible with special relativity (SR) and general relativity (GR). It provides a non-quantum mechanical description of a system of particles, or of a fluid, in cases where the velocities of moving objects are comparable to the speed of light c. As a result, classical mechanics is extended correctly to particles traveling at high velocities and energies, and provides a consistent inclusion of electromagnetism with the mechanics of particles. This was not possible in Galilean relativity, where it would be permitted for particles and light to travel at any speed, including faster than light.