Question

give an one line argument against the expansion of universe?

Answer 1

ya sure

do u know the boundary of universe? no na then how can u say that it is expanding u should have the idea about the range of boundary then only u can claim that it is expanding. as physicist says it's boundary is infinite so one could not claim that it is expanding.
the concept of multiverse is fake mathematically this is messy business. inflation theory is just a pesky thing for me. however u can use the idea of multiverse in describing parallel universe. I mean to say there are versions of universe but universe is only one.

hope this what u needed.

Answer 2

there is a boundary after 350 billion light years when light is got dull and can't be reflected from there so we all are just predecting that universe is expanding or there is multiverse other side of that black boundary so nobody knows exactly that universe is still expanding.

hope it helps