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- Seth Lloyd, Y Jack Ng
- Scientific American
- 2004

- Y. Jack Ng
- 2000

'T was noted in heaven, 't was felt in hell, And echo caught faintly the noise as it fell... Abstract By analyzing a gedanken experiment designed to measure the distance l between two spatially separated points, we find that this distance cannot be measured with uncertainty less than (ll 2 P) 1/3 , considerably larger than the Planck scale l P (or the… (More)

- Y J Ng
- Physical review letters
- 2001

We show that quantum mechanics and general relativity limit the speed nu of a simple computer (such as a black hole) and its memory space I to I(nu2) less, similar(t(-2))P, where t(P) is the Planck time. We also show that the lifetime of a simple clock and its precision are similarly limited. These bounds and the holographic bound originate from the same… (More)

At Planck-scale, spacetime is " foamy " due to quantum fluctuations predicted by quantum gravity. Here we consider the possibility of using spacetime foam-induced phase incoherence of light from distant galaxies and gamma-ray bursters to probe Planck-scale physics. In particular, we critically examine the cumulative effects of spacetime fluctuations over a… (More)

- Y. Jack Ng, H. van Dam
- 1999

A recent paper (gr-qc/9909017) criticizes our work on the structure of spacetime foam. Its authors argue that the quantum uncertainty limit for the position of the quantum clock in a gedanken timing experiment, obtained by Wigner and used by us, is based on unrealistic assumptions. Here we point out some flaws in their argument. We also discuss their other… (More)

- Y. J. Ng
- 1997

Using the nonperturbative Schwinger-Dyson equation, we show that chiral symmetry is dynamically broken in QED at weak gauge couplings when an external magnetic field is present and that chiral symmetry is restored at temperatures above T c ≃ α π 2 2π|eH|, where α is the fine structure constant and H is the magnetic field strength.

- W A Christiansen, Y Jack Ng, H van Dam
- Physical review letters
- 2006

Because of quantum fluctuations, spacetime is probably "foamy" on very small scales. We propose to detect this texture of spacetime foam by looking for halo structures in the images of distant quasars. We find that the Very Large Telescope interferometer will be on the verge of being able to probe the fabric of spacetime when it reaches its design… (More)

- Giovanni AMELINO-CAMELIA, Michele ARZANO, Y. Jack NG, Tsvi PIRAN, Hendrik VAN DAM
- 2003

There is growing interest in quantum-spacetime models in which small departures from Lorentz symmetry are governed by the Planck scale. In particular, several studies have considered the possibility that these small violations of Lorentz symmetry may affect various astrophysical observations, such as the evaluation of the GZK limit for cosmic rays, the… (More)

- Y. Jack Ng
- Entropy
- 2008

- Y. Jack Ng
- 2008

Due to quantum fluctuations, spacetime is foamy on small scales. The degree of foaminess is found to be consistent with the holographic principle. One way to detect spacetime foam is to look for halos in the images of distant quasars. Applying the holographic foam model to cosmology we "predict" that the cosmic energy density takes on the critical value;… (More)