MULTIVERSE MIGHT EXIST

Newton's laws are awesome! Once you know position and velocity of a particle , you can figure out the entire future of the particle using just one equation - > F=mass × acceleration

In quantum mechanics we say that we have a wavefunction carries all the properties of a particle and using the Schrodinger Equation , we can determine it's future. But Quantum mechanics does not stop here. As I discussed in my previous blog on introduction to Quantum Mechanics , the world seem to care about being observed and this opens up the new rules to the game - the ways of understanding Quantum mechanics.

The freakiest part about Quantum Physics is that we are using it in our daily lives without even understanding it's meaning. "Shut up and Calculate" is so famous here.

Let's look at 3 major things you need to know about to understand the whole story-
1. Superposition - It States that everything exists in all the possible permitted states at the same time; like Schrodinger's cat-both dead and alive at the same time( we gonna come to it soon).

For more look at the double slit experiment in my previous blog about quantum mechanics here .

2. Wavefunction - It gives all the information about particle and the square of wavefunction gives the probability of location of particle

3.Entanglement -

SCIENTIFIC REPRESENTATION OF ENTANGLEMENT(DON'T WORRY ABOUT THIS FOR NOW)

The quantum mechanics is probabilistic .Schrodinger himself didn't like this idea so he came up with a thought experiment to show how weird this idea is.

Here is the recipe for the experiment ⏬                      

#Take a radioactive element and place it in a box
#Put a radiation detector that triggers the release of element

#Put the cat in box and close it.

The way we have been taught Quantum mechanics - Copenhagen Interpretation , says that the because the element in the detector has the probability of being decayed and not decayed , the state of cat 🐱(Wavefunction) gets entangled with the detector and hence has the probability of being both dead and alive until we open the box.
So is it that the whole world outside the box is also a quantum blur until it is observed ?
There are two ways to answer this question , thus understand Quantum Mechanics and they both predict the concept of Many Worlds - Multiverses
1. COPENHAGEN INTERPRETATION: It just says that the quantum blurriness just disappears to macroscopic levels.

What we see as an outcome of cat being dead or alive or the double slit experiment is the result of many parallel histories and the final outcome depends upon the way system has interacted with environment resulting in Wavefunction collapse - the final outcome. It's like all the outcomes from all the possible worlds merge to give us the reality.It just says that the quantum blurriness just disappears to macroscopic levels.

But another Interpretation says that when you open up the box, you create a new universe🤯 You are made up of atoms - electrons right so each of them, so you gets entangled with the environment and hence the cat.

AND HERE IT IS-THE MANY WORLDS THEORY

This interpretation says that every outcome is possible ; opening up the box creates two different worlds in in which there is a version of you watching cat dead or alive but these new created worlds can never interact with each other .

In scientific terms, it says that the whole of the universe has one Wavefunction and when you make any decision ( not violating basic rules like - conservation of energy ) you are basically creating a new world which is doing the 'not' thing or a thing which as very less probability like - "You going outside of house amid the pandemic and not catching the virus " 

So how many worlds ??
Ah...maybe not infinite but a very very big number for sure
Radioactive decays in your body create about 10^1500 universes per second ;so yeah you can imagine
These two Interpretations are highly debated and no one knows which one is right 🤷🏻‍♀️ but they both predict the existance of multiple worlds.

Don't worry if you didn't get any of it . Believing the Many Worlds Interpretation , there is a version of you in some other universe who got the all of it ;)


refrences:

https://youtu.be/gpEvv349Pyk

https://youtu.be/kTXTPe3wahc

Copenhagen interpretation picture:https://youtu.be/gpEvv349Pyk

Many world interpretation pic -https://youtu.be/kTXTPe3wahc