####
Ng, Y. Jack

Kenan Professor

#### Contact

**Office:**234 Phillips

**Email:**yjng@physics.unc.edu

**Phone:**(919) 962-7208

**Web page:**

#### Background

Education:

Harvard University, Ph.D. Physics, 1974 (thesis advisor: J. Schwinger)

Harvard University, M.A. Physics, 1969 (graduate advisor: S. Glashow)

University of California at Berkeley, B.A. Physics, 1968

Previous Positions:

Postdoctoral Fellow, Institute for Advanced Study, Princeton, 1974-1976

Research Associate, Stanford Linear Accelerator Center, Stanford, 1976-1978

Click here for my Curriculum Vitae

#### Research

Research Interests:

Theoretical particle physics, quantum field theory, gravitation, statistical

mechanics, and cosmology

Current research:

Quantum nature of spacetime, nature of dark energy and dark matter, and quantum gravity phenomenology

#### Publications

Representative papers:

Particle phenomenology, gluon jets, quarkonium physics:

Jet Structure in electron-positron annihilation as a Test of Q.C.D.

and the

Quark Confining String (with T. DeGrand and S. H. Tye), Phys. Rev. D 16,

3251 (1977).

Hyperfine Splittings in Heavy Quark Systems (with W.

Buchmuller and S.-H. H. Tye), Phys. Rev. D24, 3003 (1981).

Unimodular gravity and the cosmological constant problem:

The Exchange of Massless Spin-Two Particles (with J. J. van

Der Bij and H. van Dam), Physica 116A, 307 (1982).

Possible Solution to the Cosmological-Constant Problem (with

H. van Dam), Phys. Rev. Lett. 65, 1972-1974 (1990).

Supersymmetry and Strings:

A Supersymmetric Confining Model of the Weak Interactions

(with B. Ovrut), Phys. Rev. D29, 138 (1984).

Heterotic String Modifications of Einstein’s and Yang-Mills’

Actions (with Y. Kikuchi and C. Marzban) Phys. Lett. 176B, 57 (1986).

Field theoretic topics:

Chiral Symmetry Breaking in a Uniform External Magnetic Field

(with D.S. Lee and C.N. Leung), Phys. Rev. D55, 6504 (1997).

Observability of the Bulk Casimir Effect: Can the Dynamical

Casimir Effect be Relevant to Sonoluminescence? (with K.A. Milton),

Phys. Rev. E57, 5504 (1998).

Spacetime fluctuations and spacetime foam physics:

Limit to Spacetime Measurement (with H. Van Dam), Mod. Phys.

Lett. A9, 335 (1994).

Probing Spacetime Foam with Extragalactic Sources (with W.A.

Christiansen and H. van Dam), Phys. Rev. Lett. 96, 051301 (2006).

Spacetime foam physics applied to cosmology:

Black Hole Computers (with S. Lloyd), Scientific American 291,

#5, 52 (November 2004 cover story).

Holographic Foam, Dark Energy, and Infinite Statistics,

Phys. Lett. B 657, 10 (2007).

Spacetime foam and Turbulence:

String Theory and Turbulence (with V. Jejjala, D. Minic and

C.H. Tze), Mod. Phys. Lett. A25, 2541 (2010).

Quantum Gravity and Turbulence (with V. Jejjala, D. Minic and

C.H. Tze), Int. J. Mod. Phys. D19, 2311 (2010).

Observational bounds on spacetime foam:

Limits on Spacetime Foam (with W.A. Christiansen,

D. Floyd and E. Perlman), Phys. Rev. D 83, 084003 (2011).

Using Observations of Distant Quasars to Constrain Quantum Gravity

(with E.S. Perlman, D.J.E. Floyd and W.A. Christiansen),

Astronomy and Astrophysics 535, L9 (2011).

Dark matter, modified Newtonian dynamics, and infinite statistics:

Cold Dark Matter with MOND Scaling (with C.M. Ho and D. Minic),

Phys. Lett. B693, 567 (2010).

Dark Matter, Infinite Statistics and Quantum Gravity (with C.M.

Ho and D. Minic), Phys. Rev. D 85, 104033 (2012).

Latest papers:

Towards a Holographic Theory of Cosmology – Threads in a Tapestry, arXiv:1305.3918 [gr-qc].

Testing MONDian Dark Matter with Galactic Rotation Curves

(with D. Edmonds, D. Farrah, C.M. Ho, D. Minic, and T. Takeuchi), arXiv:1308.3252 [astro-ph.CO]