Cosmology from the vacuum

What is the cosmological constant of the vacuum energy density?
The cosmological constant turns out to be a measure of the energy density of the vacuum - the state of lowest energy - and although we cannot calculate the vacuum energy with any confidence, this identification allows us to consider the scales of various contributions to the cosmological constant [14, 15]..
What is the density of the vacuum?
The vacuum energy density of the Universe based on 2015 measurements by the Planck collaboration is ρ_vac = 5.96\xd710⁻²⁷ kg/m³ ≘ 5.3566\xd710⁻¹⁰ J/m³ = 3.35 GeV/m³ or about 2.5\xd710⁻⁴⁷ GeV⁴ in geometrized units..
What is the vacuum catastrophe theory?
In cosmology, the cosmological constant problem or vacuum catastrophe is the substantial disagreement between the observed values of vacuum energy density (the small value of the cosmological constant) and the much larger theoretical value of zero-point energy suggested by quantum field theory..
What is the vacuum energy theory?
Vacuum energy can also be thought of in terms of virtual particles (also known as vacuum fluctuations) which are created and destroyed out of the vacuum.
These particles are always created out of the vacuum in particle–antiparticle pairs, which in most cases shortly annihilate each other and disappear..
What is the value of the vacuum energy?
Using the upper limit of the cosmological constant, the vacuum energy of free space has been estimated to be 10⁻⁹ joules (10⁻² ergs), or ~5 GeV per cubic meter..
What is vacuum in cosmology?
Recent observational studies of distant supernovae have suggested the existence of cosmic vacuum whose energy density exceeds the total density of all the other energy components in the Universe.
The vacuum produces the field of antigravity that causes the cosmological expansion to accelerate..
The cosmological constant Λ is a dimensionful parameter with units of (length)^-².
From the point of view of classical general relativity, there is no preferred choice for what the length scale defined by Λ might be.
Particle physics, however, brings a different perspective to the question.
The problem arises
This is to say that while the universe is observed to be incredibly big, physicists calculate that it must be tinier than a proton.
This, in a nutshell, is the cosmological constant problem, and it has come to be called rightly as “the worst theoretical prediction in the history of physics”.

Mar 21, 2022In this framework, physics in the cosmological spacetime is dual to the vacuum physics in a static planar asymptotically AdS Lorentzian wormhole

We argue that standard tools of holography can be used to describe fully non-perturbative microscopic models of cosmology in which a period of accelerated expansion may result from the positive potential energy of time-dependent scalar fields evolving towards a region with negative potential.

Topics referred to by the same term

Topics referred to by the same term

Cosmology from the vacuum

What is the cosmological constant of the vacuum energy density?

What is the density of the vacuum?

What is the vacuum catastrophe theory?

What is the vacuum energy theory?

What is the value of the vacuum energy?

What is vacuum in cosmology?

Vacuum catastrophe (disambiguation)