Planck Epoch (or Planck Era), from zero to approximately 10^-43 seconds (1 Planck Time):

This is the closest that current physics can get to the absolute beginning of time, and very little can be known about this period. General relativity proposes a gravitational singularity before this time (although even that may break down due to quantum effects), and it is hypothesized that the four fundamental forces (electromagnetism, weak nuclear force, strong nuclear force and gravity) all have the same strength, and are possibly even unified into one fundamental force, held together by a perfect symmetry which some have likened to a sharpened pencil standing on its point (i.e. too symmetrical to last). At this point, the universe spans a region of only 10^-35 meters (1 Planck Length), and has a temperature of over 1032°C (the Planck Temperature).

http://www.physicsoftheuniverse.com/topics_bigbang_timeline.html

For long time seemed the Friedmann equation is able to explain universe, but in recent years, the cosmological constant was of interest to cosmologists. However, these two equations are unable to explain before the Big Bang. Thus this paper, from a new approach, turns out to merge the fundamental principles of quantum physics, relativity and classical mechanics through a new definition of rest state of particles like photon, and attempts to present the reasons and the possibilities of the existence of the superluminal speeds. So according to this new view some complex concepts and unanswered questions is explained in this paper.

https://www.researchgate.net/publication/279446746_Graviton_and_cosmology_equations_before_the_Big_Bang?ev=prf_pub

Article Graviton and cosmology equations, before the Big Bang

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