Recent content by Jim

Somewhere I ran across a `prescription' for computing the radial locations of the 2 event horizons of a S-dS metric, in which one merely computes where the radial gradient of g00 component vanishes, i.e., dg00/dr = 0. I am wrong, & apparently it's sufficient to merely set g00 = 0 , in order to...

I naively imagine that a higgs & an a-higgs can annihilate by photon emission, similar to all SM particles. Is this a-higgs permitted by the SM & does the discovery of the higgs strongly suggest the a-higgs exists ?

Thanx, & will check Paul's intvw out. In an earlier paper for gen. readership, Paul implied that M-theory was not necessary, just a "useful basis to build their cyclic model upon". Still not sure I believe this, as their `std.model' relies heavily upon the Branes of M-th.at every turn of the...

Its been formalized for ~15 yrs now by Steinhardt & Turok; Wiki sez it has problems, but will not elaborate. My concern is that despite their denial, their version of CC is built on branes, which are of course a Very speculative basis, since it originates in M-theory. Worse, S&T do not seem tb...

YES ! If I can, U probably can too. I almost flunked HS because of Alg.II. I got a GREAT tutor who worked with me, and showed me how to do simple math. I went from an F to an A in 8 weeks, & my pathetic `teacher' accused me of cheating ! She could not believe it. I could because most...

Very nice pedagogical intro to LQG, Atyy. However, I was not thinking of LQG, but just a generalization of the GR field eqs, via either a complex metric or connexion. In particular, I am interested in learning of such a formulation which is then applied to either Kerr or Kerr-Newman BHs, and...

Complex (not because its difficult !), but because certain elements of classical, real GR are allowed to assume complex (real + imag parts) values, such as the metric or connexion. I am wondering if anyone is aware of any legitimate work going on in this area ?? I have already been shanghied...

Thanx all for your quik responses ! Haelfix: Agree about the historical correlation. Running with the mSSM value of 2E16 Gev for the GUT group to split into SU(3) and SU(2)xU(1), this occurs considerably prior to reheating at ~ 2E15 Gev, when FRW evolution kicks in again. The time scales...

I am simply trying to understand why dS space has a signature (4+1) ? Good old familiar Minkowski space is of course, (3+1), crystal clear. What is the role of the extra spatial dimension in dS ? Why should the manifold be 5-D ?

Hey Guys, I think we've beaten this to death...time to move on

Can someone please clarify if the energy scales of Inflation & GUTs are identical, or model-dependent ? One typically sees ~10^15 Gev to 2x10^16 Gev in the literature, which is a small variance, but its not clear if there are `standard values'. I am also curious if one can have inflation...

VKint has beautifully mathematicized what I have intuitized, and he is correct about the tidal forces from GR. I did not appreciate that the Gauss-Bonnet theorem would allow one to calculate the angle thru which a vector deviates after parallel transport around a closed curve. Neat !

No math needed, just eyeballs. Trace the initially parallel line segments of two adjacent lines of longitude on the surface of a globe, until the meet at the N. pole. Its there, that they cross, clearly violating Euclid's straight line postulate. Why: the Earth is not flat. QED