122 citations · 862 across the 39 of their papers we have counts for
13 papers · 1 filter
Probing Spacetime Foam with Extragalactic Sources of High-Energy Photons
Y. Jack Ng, Eric S. Perlman
Quantum fluctuations can endow spacetime with a foamy structure. In this review article we discuss our various proposals to observationally constrain models of spacetime foam. One…
Holographic Foam Cosmology: From the Late to the Early Universe
Y. Jack Ng
Quantum fluctuations endow spacetime with a foamy texture. The degree of foaminess is dictated by blackhole physics to be of the holographic type. Applied to cosmology, the hologra…
Entropy and Gravitation: From Black Hole Computers to Dark Energy and Dark Matter
Y. Jack Ng
We show that the concept of entropy and the dynamics of gravitation provide the linchpin in a unified scheme to understand the physics of black hole computers, space-time foam, dar…
Effective Cosmological Constant and Dark Energy
Y. Jack Ng
Two very different methods are used to estimate the magnitude of the effective cosmological constant / dark energy (for the present cosmic epoch). Their results agree with each oth…
MoNDian Dark Matter, Entropic Gravity, and Infinite Statistics
Y. Jack Ng
We propose the concept of MoNDian dark matter which behaves like cold dark matter at cluster and cosmic scales but emulates modified Newtonian dynamics at the galactic scale. The c…
Quantum Gravity and Dark Matter
Chiu Man Ho, Djordje Minic, Y. Jack Ng
We propose a connection between global physics and local galactic dynamics via quantum gravity. The salient features of cold dark matter (CDM) and modified Newtonian dynamics (MOND…
Various Facets of Spacetime Foam
Y. Jack Ng
Spacetime foam manifests itself in a variety of ways. It has some attributes of a turbulent fluid. It is the source of the holographic principle. Cosmologically it may play a role…
Holographic Foam, Dark Energy and Infinite Statistics
Y. Jack Ng
Quantum fluctuations of spacetime give rise to quantum foam, and black hole physics dictates that the foam is of holographic type. Applied to cosmology, the holographic model requi…
Hubble Meets Planck: A Cosmic Peek at Quantum Foam
Y. Jack Ng
If spacetime undergoes quantum fluctuations, an electromagnetic wavefront will acquire uncertainties in direction as well as phase as it propagates through spacetime. These uncerta…
Quantum Foam and Quantum Gravity Phenomenology
Y. Jack Ng
Spacetime undergoes quantum fluctuations, giving rise to spacetime foam, a.k.a. quantum foam. We discuss some properties of spacetime foam, and point out the conceptual interconnec…
Spacetime Foam, Holographic Principle, and Black Hole Quantum Computers
Y. Jack Ng, H. van Dam
Spacetime foam, also known as quantum foam, has its origin in quantum fluctuations of spacetime. Arguably it is the source of the holographic principle, which severely limits how d…
Comment on "Uncertainty in measurements of distance"
Y. Jack Ng, H. van Dam
We have argued that quantum mechanics and general relativity give a lower bound on the measurement uncertainty of any distance much greater than…
Black Holes, Mergers, and the Entropy Budget of the Universe
Thomas W. Kephart, Y. Jack Ng
Vast amounts of entropy are produced in black hole formation, and the amount of entropy stored in supermassive black holes at the centers of galaxies is now much greater than the e…