# Christopher T. Hill

Christopher T. Hill
BornJune 19, 1951 (age 67)
NationalityAmerican
Alma materM.I.T.
Caltech
Known forTopcolor; Top quark condensate; Dimensional deconstruction; Theory of UHE Cosmic Rays; Soft Nambu-Goldstone Boson model of Dark Matter.
Scientific career
InstitutionsFermilab

Christopher T. Hill (born June 19, 1951) is an American theoretical physicist at the Fermi National Accelerator Laboratory who did undergraduate work in physics at M.I.T. (B.S., M.S., 1972), and graduate work at Caltech (Ph.D., 1977, Murray Gell-Mann). Hill's Ph.D. thesis, "Higgs Scalars and the Nonleptonic Weak Interactions" (1977) contains the first detailed discussion of the two-Higgs-doublet model.[1]

Hill has made numerous contributions to dynamical theories of electroweak symmetry breaking, and is a co-originator of the top quark infrared fixed point,[2] top quark condensates,[3] topcolor,[4][5] top-seesaw models,[6] and dimensional deconstruction.[7] He is also an originator of cosmological models of dark energy and dark matter based upon ultra-low mass (Nambu-Goldstone) bosons generally associated with neutrino masses.[8] He was first to propose that the cosmological constant is connected to the neutrino mass as ${\displaystyle \Lambda \sim m_{\nu }^{4}}$.[9] With the late David Schramm (astrophysicist), he developed transport equations describing the evolution of the spectrum of ultra-high-energy (UHE) cosmic rays[10] and proposed modern theories of the origin of ultra-high-energy (UHE) nucleons and (UHE) neutrinos from grand unification relics, such as cosmic strings and monopole annihilation.[11][12][13]

Recently, Hill has focused on the idea that all fundamental mass scales may be associated with spontaneously broken scale symmetry, or (Weyl symmetry)[14] and that the Planck mass, and the inflationary phase of the ultra-early universe, are generated together as part of a unified phenomenon. [15] This leads to a new concept of "inertial symmetry breaking."[16] Some of these ideas were elaborated in a talk given on the occasion of the celebration of the 75th birthday of Murray Gell-Mann in Santa Fe, New Mexico, (2005).[17]

Hill is a Fellow of the American Physical Society and formerly Head of the Theoretical Physics Department at Fermilab (2005 - 2012). He has co-authored three popular books about science, particle physics and cosmology, and the commissioning of the Large Hadron Collider, with Nobel laureate Leon Lederman.

## Books

• Symmetry and the Beautiful Universe, Christopher T. Hill and Leon M. Lederman, Prometheus Books (2005)[1]
• Quantum Physics for Poets, Christopher T. Hill and Leon M. Lederman, Prometheus Books (2010)[2]
• Beyond the God Particle, Christopher T. Hill and Leon M. Lederman, Prometheus Books (2013)[3]
• Hill's scientific publications are available on the INSPIRE-HEP Literature Database [4]
• EmmyNoether.com, Educational website of Christopher T. Hill and Leon M. Lederman, [5]
• Website of Christopher T. Hill [6]

## References

1. ^ "Higgs Scalars and the Nonleptonic Weak Interactions" (1977)
2. ^ Hill, Christopher T. (1 August 1981). "Quark and lepton masses from renormalization-group fixed points". Physical Review D. 24 (3): 691–703. Bibcode:1981PhRvD..24..691H. doi:10.1103/PhysRevD.24.691.
3. ^ Hill, C (1990). "Minimal dynamical symmetry breaking of the standard model". Phys. Rev. D. 41 (5): 1647–1660. Bibcode:1990PhRvD..41.1647B. doi:10.1103/PhysRevD.41.1647.
4. ^ Hill, C (1995). "Topcolor Assisted Technicolor". Phys. Lett. B. 345 (4): 483–489. arXiv:hep-ph/9411426. Bibcode:1995PhLB..345..483H. doi:10.1016/0370-2693(94)01660-5.
5. ^ Hill, Christopher T. (1991). "Topcolor: top quark condensation in a gauge extension of the standard model". Physics Letters B. 266 (3–4): 419–424. Bibcode:1991PhLB..266..419H. doi:10.1016/0370-2693(91)91061-Y.
6. ^ Hill, C (1999). "Top quark seesaw theory of electroweak symmetry breaking". Phys. Rev. D. 59: 075003. arXiv:hep-ph/9807262. Bibcode:1999PhRvD..59a5003B. doi:10.1103/PhysRevD.59.015003.
7. ^ Hill, C (2001). "Gauge invariant effective Lagrangian for Kaluza-Klein modes". Phys. Rev. D. 64 (10): 105005. arXiv:hep-th/0104035. Bibcode:2001PhRvD..64j5005H. doi:10.1103/physrevd.64.105005.
8. ^ Hill, C (1995). "Cosmology with ultralight pseudo Nambu-Goldstone bosons". Phys. Rev. Lett. 75 (11): 2077–2080. arXiv:astro-ph/9505060. Bibcode:1995PhRvL..75.2077F. doi:10.1103/PhysRevLett.75.2077. PMID 10059208.
9. ^ Hill, C (1989). "Cosmological Structure Formation from Soft Topological Defects" (PDF). Comments on Nucl. Part. Phys. 19. pp. 25–39.
10. ^ Hill, Christopher T.; Schramm, David N. (1 February 1985). "Ultrahigh-energy cosmic-ray spectrum". Physical Review D. 31 (3): 564–580. Bibcode:1985PhRvD..31..564H. doi:10.1103/PhysRevD.31.564.
11. ^ Hill, C (1987). "Ultrahigh-Energy Cosmic Rays from Superconducting Cosmic Strings". Phys. Rev. D. 36 (4): 1007. Bibcode:1987PhRvD..36.1007H. doi:10.1103/physrevd.36.1007.
12. ^ Hill, C (1992). ""Grand unified theories," topological defects and ultrahigh-energy cosmic rays". Phys. Rev. Lett. 69 (4): 567–570. Bibcode:1992PhRvL..69..567B. doi:10.1103/PhysRevLett.69.567. PMID 10046974.
13. ^ Hill, Christopher T. (1983). "Monopolonium". Nuclear Physics B. 224 (3): 469–490. Bibcode:1983NuPhB.224..469H. doi:10.1016/0550-3213(83)90386-3.
14. ^ Hill, Christopher T. (4 April 2014). "Is the Higgs boson associated with Coleman-Weinberg dynamical symmetry breaking?". Physical Review D. 89 (7): 073003. arXiv:1401.4185. Bibcode:2014PhRvD..89g3003H. doi:10.1103/PhysRevD.89.073003.
15. ^ Ferreira, Pedro G.; Hill, Christopher T.; Ross, Graham G. (8 February 2017). "Weyl current, scale-invariant inflation, and Planck scale generation". Physical Review D. 95 (4): 043507. arXiv:1610.09243. Bibcode:2017PhRvD..95d3507F. doi:10.1103/PhysRevD.95.043507.
16. ^ Ferreira, Pedro G.; Hill, Christopher T.; Ross, Graham G. (2018). "Inertial Spontaneous Symmetry Breaking and Quantum Scale Invariance". arXiv:1801.07676 [hep-th].
17. ^ Hill, Christopher T (2005). "Conjecture on the Physical Implications of the Scale Anomaly". arXiv:hep-th/0510177.