In this new view, time didn't have a beginning, and the Big Bang resulted from a collision
of branes, sheetlike spaces that exist within a higher - dimensional reality.
«It was clear that a collision
of branes would be a dramatic event,» Turok says.
Look up the collision
of branes, virtual particles and an expanding singularity.
Open strings are anchored to the surface
of a brane, so the particles associated with them are stuck on the brane.
In the process, it shed another kind
of brane into the 11 - dimensional gap.
But a putative particle called the sterile neutrino, which interacts with other particles only through gravity, would be able to travel in and out
of the brane, taking shortcuts through the extra dimensions.
We could manufacture larger versions or mass - produce thousands
of Brane Crafts and send them out to deflect incoming asteroids.
P.L. McFadden, N. Turok, P.J. Steinhardt, Solution
of a Brane World Big Crunch / Big Bang Cosmology, Phys.
I've got the wrong kind
of brane perhaps.
Not exact matches
[3][4] One new cyclic model is a
brane cosmology model
of the creation
of the universe, derived from the earlier ekpyrotic model.
As was already pointed out by Edward Feser in the June / July issue
of First Things, even if one grants that string theory is true, Krauss has already conceded the very medieval axiom he thought he was dispatching, since, after all, a «
brane» (assuming it exists) is something.
If there is no rebound in the universe, this lends to the
brane collision origin
of the Big Bang, versus a cyclic universe.
The valve consists
of two separate parts, including a hard plastic piece and a removable mem -
brane.
Maybe, string /
brane / M theory would explain the amount
of that mysterious «dark» energy in space and all would be well.
In keeping with this two - dimensional analogy, string theorists describe our observable universe as a membrane — «
brane» for short — flapping in the breezes
of the actual 10 - dimensional cosmos.
If the interaction between
branes was a collision, it would trigger a fantastically powerful reaction, Steinhardt guessed, given the immense amounts
of matter and energy in each one.
«Much to our surprise, after doing these enormous, intricate calculations, we found out colliding
branes would produce exactly the same pattern
of temperature fluctuations,» says Turok.
That didn't mean the
branes were voids: Quantum theory asserts that even the total vacuum
of empty space is seething with «virtual» subatomic particles that constantly wink in and out
of existence.
So a crash between two empty
branes would still be a collision
of gigantic proportions.
Calculations suggested that the crash would generate a universe - wide fireball
of pure energy within each
brane.
Just as two sheets
of paper could be blown together in a storm, different 3 - D
branes could collide within the bulk.
One reason is that at the moment
of collision, the extra dimension separating the two
branes goes from vanishingly small to literally zero.
Some versions
of string theory, an all - encompassing theory
of particle physics, suggest that our three - dimensional universe could exist within a four - dimensional sheet called a
brane.
Most
of the particles in our universe stick within the
brane, but theorists have proposed that some neutrinos might be able to travel through the bulk as well.
While the electromagnetic and nuclear forces are stuck inside a «
brane» made
of four dimensions, gravity leaks out into the fifth.
But describing black
branes requires Einstein's equations, which are complex and unwieldy, says Joan Camps at the University
of Cambridge, who was not involved in the new work.
Particles could be stuck to a three - dimensional
brane, sort
of like things could be stuck to the two - dimensional surface
of a shower curtain in our three - dimensional space.
Now Jay Armas
of Copenhagen University in Denmark and colleagues have shown that black
branes can behave like solids as well.
So when the authors claim that our 3 - D universe is part
of a 10 - dimensional «
brane» and that cycles
of expansion and contraction result from collisions between our cosmic
brane and a neighboring one, the best most readers can do is visualize two giant hands clapping the universe into existence over and over again.
At galactic scales, matter within
branes will have a range
of distributions
of orbits and velocities about a given barycentre.
Over cosmological timescales, matter will gravitationally collapse around common centres
of mass (barycentres) that are shared across
branes.
Joseph Polchinski, Firewall Institution: University
of California, Santa Barbara Year: 2012 Known for: Discovering D -
branes, explaining what D -
branes are (a string theory thing) Idea: Once a black hole has lost about half
of itself to Hawking radiation, the event horizon can no longer store enough encoded information to tell the story
of what's inside.
«So what looks sort
of disastrously singular, when you describe it as a
brane collision, is not very singular at all,» Turok explains.
Early in 2001, cosmologists Justin Khoury and Paul Steinhardt
of Princeton, another inflationary pioneer, Neil Turok
of the University
of Cambridge, and Ovrut put their
branes to work on the big bang.
This attractive force between
branes would in fact be a special case
of the kind
of force that inflationary cosmologies posit to explain the early universe's blowup.
Our
brane and its counterpart would bounce off each other as usual, but instead
of going their separate ways, they would smack each other again and again as if connected by a spring.
They collapsed one
of these dimensions mathematically into a minuscule line, yielding an 11 - dimensional spacetime, flanked on either side by two 10 - dimensional membranes, or
branes, colorfully dubbed «end
of the world»
branes.
Then later last year, the group discovered in collaboration with Nathan Seiberg
of the Institute for Advanced Study that the singularity could be interpreted as a collision between the two «end
of the world»
branes, in which only the gap dimension separating them shrinks down to zero for an instant.
It will still be quite some time before
Brane Crafts are unleashed upon the hordes
of space junk orbiting our planet.
J. Khoury, B.A. Ovrut, P.J. Steinhardt, N. Turok, The Ekpyrotic Universe: Colliding
Branes and the Origin
of the Hot Big Bang, Physical Review D64, 2001, 123522
Orally ingested plant lectins remaining at least partially undigested in the gut may bind to a wide variety
of cell mem -
branes and glycoconjugates
of the intestinal and colonic mucosa, leading to various deleterious effects on the mucosa itself as well as on the intestinal bacterial flora and other inner organs (26, 27).
Brane anticipates the film will be completed by the end
of 2017.