Exploring the Lambda Constant and the Big Bang Theory

[bobsmith76]

You know how the lambda constant just grew exponentially in the first second of the universe? That was just a temporary thing right?

 

[Calrid]

You know how the lambda constant just grew exponentially in the first second of the universe? That was just a temporary thing right?

Did it though? Think about it? Seriously hasn't it always been the same in one way.

I'm not sure what you are asking though as the first second contained an awful lot of stuff including some hyperinflation supposedly and the formation of atomic particles.

Could you rephrase it so you are being specific?

 

[yenchin]

You know how the lambda constant just grew exponentially in the first second of the universe? That was just a temporary thing right?

Do you mean the inflationary epoch? Usually Lambda refers to cosmological *constant* with does not vary in time (there are various dark energy models that do vary in time, cosmological constant is only one of the many models to explain accelerated expansion in late time, i.e. now.) In the inflationary epoch, the inflation is supposedly caused by the inflaton field, which potential term is large and drives the inflation. That is different from Lambda.

 

[bapowell]

As yenchin says, the inflationary expansion and the accelerated expansion of the modern epoch (perhaps due to lambda) are two separate things. Still, inasmuch as you can model inflation with lambda, such a constant in the early universe still could not have grown exponentially. Inflation has a rather strict requirement that the energy density (lambda) remain approximately constant during the expansion period. Instead, it is the scale factor, a(t), that grew exponentially during inflation: a(t) \propto e^{Ht}

 

[Farahday]

You know how the lambda constant just grew exponentially in the first second of the universe? That was just a temporary thing right?

Yeah...and the Universe hasn't been the same SINCE.