Why does the universe exist?

Why does the universe exist?
Can cosmology explain?
There is no why, no motive. It was mathematically "necessary" that the universe would emerge from the mathematical pre-BB conditions. An example of "Necessity and Sufficiency"
200px-Solar_eclipse_1999_4_NR.jpg
The sun being above the horizon is a necessary condition for direct sunlight; but it is not a sufficient condition, as something else may be casting a shadow, e.g., the moon in the case of an eclipse.

https://en.wikipedia.org/wiki/Necessity_and_sufficiency#Necessity
 
because something comes from nothing,
nothing is the initial state.
How do you know nothing is the initial state? What is your definition of nothing? Is it the base state? In quantum physics the base state is non-zero.
 
When energy first exist in universe?
High School's Physics says energy cannot be destroyed nor created, is it true?
Where did energy come from?
 
High School's Physics says energy cannot be destroyed nor created, is it true?

In this Universe since that's all we can observe. It says nothing about before this Universe.

If "God" created the Universe as you believe then that also would show that something came from nothing.
 
Saint said: Why does the universe exist? Can cosmology explain?

Tegmark's Mathematical Universe; Mathematical universe hypothesis (MUH) ?
Tegmark's MUH is:
Our external physical reality is a mathematical structure.[3] That is, the physical universe is not merely described by mathematics, but is mathematics (specifically, a mathematical structure).
Mathematical existence equals physical existence, and all structures that exist mathematically exist physically as well. Observers, including humans, are "self-aware substructures (SASs)". In any mathematical structure complex enough to contain such substructures, they "will subjectively perceive themselves as existing in a physically 'real' world".
The theory can be considered a form of Pythagoreanism or Platonism in that it proposes the existence of mathematical entities; a form of mathematical monism in that it denies that anything exists except mathematical objects; and a formal expression of ontic structural realism.
Tegmark claims that the hypothesis has no free parameters and is not observationally ruled out. Thus, he reasons, it is preferred over other theories-of-everything by Occam's Razor. Tegmark also considers augmenting the MUH with a second assumption, the
computable universe hypothesis (CUH), which says that the mathematical structure that is our external physical reality is defined by computable functions......more.

https://en.wikipedia.org/wiki/Mathematical_universe_hypothesis
 
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