Seeing the real Big Bang by using gravitational waves is an interesting thing. The idea is that the extremely powerful gravitational waves are released from the Big Bang when the material has been released to space. But there is a couple of problems with that thing.
The first problem is being sure that the gravitational waves observed are coming from the Big Bang. There are forming gravitational waves all the time in the universe, when the black holes collide and when they are oscillating. Those black holes are sending powerful gravitational waves through the universe, and that means the gravitational waves. Which origin is in Big Bang are hard to find from other gravitational waves.
The second and more massive problem is that if we want to observe the Big Bang are traveling just ahead of the material. So that means there is needed some kind of echo of the gravitational wave that we can see those things. The gravitational waves are like waves in the water. When the highly massive objects are colliding or oscillating they are sending the waves of gravitation to space.
So the gravitational waves that send from the Big Bang travel like gravitational waves that are released from the collisions of Black Holes. But what the gravitational waves are? They are suddenly appearing things that are causing the strengthening of the gravitational field. Ligo's (The Laser Interferometer Gravitational-Wave Observatory) homepage determines gravitational waves that gravitational waves are ripples in space-time.
Or otherwise saying gravitational waves are the traveling gravitation fields. But how gravity field can travel? There is the possibility that the gravitons are the hypothetical transportation particles of gravitation. Or is it the energy load, that travels through dark matter? Theories about gravitation are basing the idea that gravitation is like light. That means it can be the same time wave movement and particles.
The theory of gravitation goes like this. Gravitation is an interaction and both parts of the gravitational system are pulling each other together. The graviton would be the transportation particle of the gravitation. So when the object interacts by gravitons it will send some kind of strings between objects, and then those strings are starting to pull the objects together.
The fact is that they can be the waves of gravitons, the hypothetical transportation particles of gravitation. Or they can be the waves of dark matter. Dark matter is one of the most dominating things in the universe. The thing that makes it "dark" is that thing invisible material doesn't react with the material. But otherwise, it's like normal material. And the only common force that causes interaction between dark and visible material is gravitation.
()https://www.ligo.caltech.edu/page/what-are-gw
()https://www.space.com/big-bang-study-with-gravitational-waves
()https://en.wikipedia.org/wiki/Gravitational_wave
()https://en.wikipedia.org/wiki/Graviton
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