If vacuum had a negative energy density would this cause
the curvature of the inside of a sphere to not be flat?

What would the observable astronomical effects of a
negative vacuum energy density be? Could it create
voids? Could it effect the Greisen-Zatsepin-Kuz'min
cutoff or accelerate cosmic rays formed in intergalactic
voids? Would it effect orbital periods?

I am aware that astronomical observations say the
energy density is close to zero. I am wondering how
they would differ if it were negative.

"Ed Keane III" wrote in message
. ..
If vacuum had a negative energy density would this cause
the curvature of the inside of a sphere to not be flat?

What would the observable astronomical effects of a
negative vacuum energy density be? Could it create
voids? Could it effect the Greisen-Zatsepin-Kuz'min
cutoff or accelerate cosmic rays formed in intergalactic
voids? Would it effect orbital periods?

I am aware that astronomical observations say the
energy density is close to zero. I am wondering how
they would differ if it were negative.

The cosmological constant represents a net constant
negative energy density. Consider a Universe with a
pure cosmological constant, A, and nothing else: we
get "de Sitter's solution"

a(t) = exp(H t), H = sqrt(A / 3)

wherein space expands exponentially with time; Hubble's
constant, H, is truly independent of time; the age of the
Universe is infinite (present time, a = 1 at t = 0). See

"Principles of Physical Cosmology" by P.J.E. Peebles

[Old Man]