# Why do we need QFT?

## Why do we need QFT?

**QFT** is used in particle physics to construct physical models of subatomic particles and in condensed matter physics to construct models of quasiparticles. **QFT** treats particles as excited states (also called quanta) of their underlying quantum fields, which are more fundamental than the particles.

## Does anyone understand quantum mechanics?

**Quantum mechanics** must be one of the most successful theories in science. ... Yet the weird thing is that **no one** actually **understands quantum** theory. The quote popularly attributed to physicist Richard Feynman is probably apocryphal, but still true: if you think you **understand quantum mechanics**, then you don't.

## Did Einstein believe in quantum physics?

**Einstein** saw **Quantum Theory** as a means to describe Nature on an atomic level, but he doubted that it upheld "a useful basis for the whole of **physics**." He thought that describing reality required firm predictions followed by direct observations.

## What kind of math is used in string theory?

For some sub-fields like **string** pheonomenology, topological **string theory**, etc., one needs more **mathematics** - a serious course in algebraic geometry and homological algebra, depending on what your goals are.

## What should I learn before quantum mechanics?

**In order to study elementary quantum mechanics you must ideally have an understanding of the following mathematical ideas:**

- Complex numbers.
- Partial and Ordinary differential equations.
- Integral calculus I-III.
- linear algebra.
- fourier analysis.

## How long does it take to learn quantum mechanics?

between 6 and 18 months

## Is it possible to learn physics on your own?

Yes, you can **study physics** by yourself and a lot of people **learn** things in a casual manner because **its** so mind stimulating and engaging. The best part is there is no pressure to **learn** everything within a certain time period or any exams to worry about.

## What is the quantum theory equation?

Wavefunctions. A fundamental physical **constant** occurring in quantum mechanics is the Planck **constant**, h. A common abbreviation is ħ = h/2π, also known as the reduced Planck **constant** or Dirac **constant**. The general form of wavefunction for a system of particles, each with position ri and z-component of spin sz i.

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