How would you define beginning? And as far as what seems to be expansion may well be a reverberating contraction. We just do not know, all you can know is what you think is realIf primordial black holes did exist in the beginnings of the Universe - might they have been a driving force in it's initial expansion?
According to the scientific method the universe can not be proved to existYes, what you believe is real and what you can prove through the Scientific Method, which is, according to Purdue University:
The scientific method provides an organized way to think about and solve problems based on data. Most scientists describe it as the following steps:
1. State the problem. State the problem that you will study as clearly and concisely as possible.
2. Form the hypothesis. Describe what you think the result of your study will be.
3. Observe and experiment. Observe or set up an experiment to test your hypothesis. Tally your data.
4. Interpret the data. Once you have collected your data, you must understand what it tells you. The data can be interpreted by comparing numbers visually and/or in graphic form.
5. Draw conclusions. Did your observations and/or experiments support your hypothesis? Was your hypothesis proved or disproved by your study? Did your results show a strong correlation? Were there things that could be changed to make a better experiment? Are there things that need to be studied further?
I often relied on Hegel's dialectical method, which consists of "triads" whose members "are called the thesis, antithesis, synthesis," when I used to write and critique.