The Cosmic Microwave Background (CMB) could simply be our Unruh Mirror, due to the accelerating expansion of the Universe. Maybe we are not looking at our remote past, but at our face in that black mirror, rising on the horizon like an aurora.
As seen in the main article, the accelerating expansion of the Universe may be read as the combined effect of the inertial free falls of all galaxies. Like any free fall acceleration, this one should cause tidal effects. But let’s be careful: the acceleration of each galaxy is relative to all the points of its spherical horizon (or background), so that tide does not have a privileged direction, but it emerges like a growing rotation involving the fabric of each galactic space, as Universe’s age (and entropy) increases.
Every accelerated body should see its own background (or its horizon) not as perfectly black and cold, but as slightly “warmed up”, owing to the so-called Unruh Effect.
U.E. is the “black body” radiation that an uniformly accelerated observer sees: his/her background (or his/her horizon) appears warmer and in a thermodynamic equilibrium, whereas a static observer sees nothing. (This is the link to Wikipedia).
That is very interesting. If our definition of accelerating expansion of the Universe is correct, and if our galaxy is really in a condition of inertial acceleration (inertial free fall), it means we should perceive our background or horizon as characterized by the typical thermodynamic emission of a “black body”.
The Cosmic Microwave Background (CMB), discovered in 1964 almost by accident by American radio astronomers Arno Penzias and Robert Wilson, is a weak background glow in the microwave region of the radio spectrum, that is not associated with any source and is coming from all directions in the sky. It was studied for decades as the still present and clear relic of the Big Bang. But CMB has just this characteristic: it is the most precise “black body” radiation we know.
The global redshift of radiation (then the moving away of all galaxies – and of the horizon, too), due to the accelerating expansion of the Universe, cannot be physically differentiated, in its results or effects, from one’s own acceleration. If so, the expected Unruh Effect, rising from a running away background, is right there, where the CMB is. (This is also the idea, leading however to other conclusions, of the New Zealand researcher Marni Dee Sheppeard).
If so, weak anisotropies, or heterogeneities, which we notice in CMB, would be due to our local scale heterogeneity, that is reflected repeatedly against the smooth background (like damped rebounds of a ball, up and down, on a trampoline) in the middle of a confused echo emerging from every reflecting direction.
So perhaps we are studying in depth our Unruh Mirror, and not an evenly spaced trace of the incredibly hot birth of the Universe!
Maybe, we are not looking at our remote past, but at our face in a black mirror, a scattered self-impression that is rising on the horizon like an aurora.
A vapor trail left by our own trip. Funny possibility, isn’t it?
Maybe, we need to change our conception of the cosmological horizon.
Go to the main article about Dark Matter or feel free to leave a comment.