Big Bang is plausible if placed in the context of M-Theory. Where the universe exists in infinite parallels.

https://en.wikipedia.org/wiki/M-theory (String theories)

**Heterotic M-theory[edit]**
Because of the difficulties with

*G*2 manifolds, most attempts to construct realistic theories of physics based on M-theory have taken a more indirect approach to compactifying eleven-dimensional spacetime. One approach, pioneered by Witten, Hořava,

Burt Ovrut, and others, is known as heterotic M-theory. In this approach, one imagines that one of the eleven dimensions of M-theory is shaped like a circle. If this circle is very small, then the spacetime becomes effectively ten-dimensional. One then assumes that six of the ten dimensions form a Calabi–Yau manifold. If this Calabi–Yau manifold is also taken to be small, one is left with a theory in four-dimensions.

[69]
Heterotic M-theory has been used to construct models of

brane cosmology in which the observable universe is thought to exist on a brane in a higher dimensional ambient space. It has also spawned alternative theories of the early universe that do not rely on the theory of

cosmic inflation.

[69]
https://en.wikipedia.org/wiki/Brane_cosmology
**Brane and bulk[edit]**
Main article:

Brane
The central idea is that the visible,

three-dimensional universe is restricted to a

brane inside a

higher-dimensional space, called the "bulk" (also known as "hyperspace"). If the additional

dimensions are

compact, then the observed universe contains the extra dimension, and then no reference to the bulk is appropriate. In the bulk model, at least some of the extra dimensions are extensive (possibly infinite), and other branes may be moving through this bulk. Interactions with the bulk, and possibly with other branes, can influence our brane and thus introduce effects not seen in more standard cosmological models.

Ok this is pretty much how I how see it too. This is easy for me because I don't have to verify anything, define the basic laws of physics or derive any models.

https://en.wikipedia.org/wiki/Multiverse
**Search for evidence[edit]**
Around 2010, scientists such as Stephen M. Feeney analyzed

Wilkinson Microwave Anisotropy Probe (WMAP) data and claimed to find evidence suggesting that our universe collided with other (parallel) universes in the distant past.

[16][17][18] However, a more thorough analysis of data from the WMAP and from the

Planck satellite, which has a resolution 3 times higher than WMAP, did not reveal any statistically significant evidence of such a

bubble universe collision.

[19][20] In addition, there was no evidence of any gravitational pull of other universes on ours.

[21][22]
About

**time**, it certainly is a real phenomenom

*per se* and unidirectional, a basic thing independent of the big bang, expansion or oscillation. This is also why it is an important factor in many formulas. Time has no beginning or end. If there was, what would be there beyond?

Edit: We humans trying to find explanations to universe and basic phenomena, and defining "laws" are the really funny thing. Our modern science is very young and most likely will go to extinction without really understanding all this.