Things decay because of time..
Among physicists, there is no real doubt that time does really, truly exist. It's a measurable, observable phenomenon. Physicists are just divided a bit on what causes this existence, and what it means to say that it exists. Indeed, this question borders the realm of metaphysics and ontology (the philosophy of existence) as much as it does on the strictly empirical questions about time that physics is well-equipped to address.
mister bill.
i love you,
but i have several things to say in response to your post,
at the end of which feel free to call me a tosser,
and we will still remain friends.
firstly,
your post very much sounds like a cut+paste from a google search, in order to make you seem more knowledgeable than you actually are.
as such...
secondly,
plagiarism is a cheeky thing that often backfires.
thirdly,
this may come as a surprise,
but not everything you read on the internet is true.
fourthly,
i was trained as a theoretical physicist,
which in theory (geddit) makes me a physicist that disagrees.
so your statement that "among physicists there is no real doubt that time does truly exist" is incorrect.
fifthly,
to many practicing physicists time is not fundamentally real.
we may feel like we experience it as real, there is no proof it is.
(if you don't believe me use your google search and you will see.)
sixthly,
this "arrow of time" theory oft used is a paradox,
and ultimately an illusion.
granted, a very powerful one.
seventhly,
einstein proved that, on its own, time isn't absolute.
time doesn't exist unless it is entwined with space.
i am certainly not saying space time doesn't exist,
but time on its own is a highly improbable solution.
it is a way for us to try to understand what is going on.
but it has flaws that cannot be overcome.