Was there light at the very instant of Big Bang?

At the big bang is undefined. Immediately after the big bang, the universe consisted of extremly high energy photons (icnluding light) and particles.

As mathematics, has briefly described, we do not understand how the universe started, prior to inflation out understanding is based upon our research in high energy particle physics and the related thermodynamics. We know the universe started at a hot dense state, but not the reason behind that beginning. Our knowledge of particle physics show us that one the of the earliest particles to drop out of thermal equilibrium is the photon however the photon needs a mean free path to be detectable. At the earlier stages of the universes beginning that mean free path is to short for us to see today. Google dark ages cosmology

http://en.wikipedia.org/wiki/Chronology_of_the_universe

we will not see prior to the dark ages due to the mean free of photons, our best hope of gathering direct observational information prior to the dark ages lies in the neutrino background. However out ability to detect neutrinos is limited. As such much of the physics prior to inflation is conjectural, we also cannot simulate the temperatures involved in the lab. Though we are making progress with the LHC research.

 

for more information

 

http://arxiv.org/pdf/hep-th/0503203.pdf "Particle Physics and Inflationary Cosmology" by Andrei Linde
http://www.wiese.itp.unibe.ch/lectures/universe.pdf:" Particle Physics of the Early universe" by Uwe-Jens Wiese Thermodynamics, Big bang Nucleosynthesis

Edited June 2, 201411 yr by Mordred

 

we will not see prior to the dark ages due to the mean free of photons, our best hope of gathering direct observational information prior to the dark ages lies in the neutrino background. However out ability to detect neutrinos is limited. As such much of the physics prior to inflation is conjectural, we also cannot simulate the temperatures involved in the lab. Though we are making progress with the LHC research.

 

for more information

 

http://arxiv.org/pdf/hep-th/0503203.pdf "Particle Physics and Inflationary Cosmology" by Andrei Linde

http://www.wiese.itp.unibe.ch/lectures/universe.pdf:" Particle Physics of the Early universe" by Uwe-Jens Wiese Thermodynamics, Big bang Nucleosynthesis

 

Do you mean information/detection/measurement=Creation

no I mean we have no means to gather direct measurements prior to the time of the CMB, so any knowledge we have is based on LHC studies and indirect measurements of the CMB anistropies

We know the universe started at a hot dense state, but not the reason behind that beginning. Our knowledge of particle physics show us that one the of the earliest particles to drop out of thermal equilibrium is the photon however the photon needs a mean free path to be detectable.

 

It is often said that everything (time, space, matter etc.) originated with the big bang.

 

How can hotness, denseness, temperature etc. be defined at the big bang or at inflation?

 

And for that matter how can we even say that 'everything' was concentrated in a very small space before big bang? Space/concentration is not defined before big bang.

the articles I linked cover those questions. Take the expansion history, we know how the universe expands today, reverse that expansion history. As the observable universe decreases in volume, density and temperature increases. We have observational evidence that supports this. the Universe expands, and hence it was smaller at earlier times. The energy was concentrated in a small region of space, and thus the temperature was high. Processes, which can be studied today only with the biggest particle accelerators, happened naturally at that time.

 

here is the chronology of the universe

 

http://en.wikipedia.org/wiki/Chronology_of_the_universe

http://en.wikipedia.org/wiki/Graphical_timeline_of_the_Big_Bang

http://en.wikipedia.org/wiki/Big_Bang

http://planck.cf.ac.uk/science/timeline/universe/bigbang

Edited June 3, 201411 yr by Mordred

How long after the big bang until neutrinos escaped? Maybe someday we will learn to detect neutrinos at will and can explore what happened when the neutrinos got away.

How long after the big bang until neutrinos escaped?

 

About 2 seconds.

http://en.wikipedia.org/wiki/Cosmic_neutrino_background