Christopher T. Hill

Christopher T. Hill
Born (1951-06-09) June 9, 1951
Neenah, Wisconsin
Nationality American
Alma mater M.I.T.
Caltech
Known for Topcolor; Top quark condensate; Dimensional deconstruction; Theory of UHE Cosmic Rays; Soft Nambu-Goldstone Boson model of Dark Matter.
Scientific career
Institutions Fermilab
Doctoral advisor Murray Gell-Mann

Christopher T. Hill (born June 9, 1951) is an American theoretical physicist at the Fermi National Accelerator Laboratory. He 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] The "late time phase transition" in the early universe with Schramm and Fry, is the first paper to propose that the relic cosmological constant is connected to the neutrino mass as .[9] With the late David Schramm (astrophysicist), he also developed 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]

In 2005 Hill gave a summary talk at a major conference where he focused upon the question, "what if the chestnut of theorists, supersymmetry, is not discovered at the Large Hadron Collider (LHC) in Geneve?"[14] The LHC did not discover supersymmetry, but it may still exist at much higher energy scales. The existence of the lowly, unaccompanied Higgs boson presents a major enigma for theoretical physics.

In search of alternative symmetry principles, Hill's research has recently focused on the idea that all fundamental mass scales may be associated with spontaneously broken scale symmetry, or (Weyl symmetry)[15] and that the Planck mass, and the inflationary phase of the ultra-early universe, are generated together as part of a unified phenomenon. [16] This leads to a new concept of "inertial symmetry breaking," which implies that there are no fundamental mass scales, and only dimensionless ratios of masses occur in nature.[17] 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).[18]

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)
  • Quantum Physics for Poets, Christopher T. Hill and Leon M. Lederman, Prometheus Books (2010)
  • Beyond the God Particle, Christopher T. Hill and Leon M. Lederman, Prometheus Books (2013)
  • Hill's scientific publications are available on the INSPIRE-HEP Literature Database
  • EmmyNoether.com, Educational website of Christopher T. Hill and Leon M. Lederman,
  • Website of Christopher T. Hill

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, C (2005). "Suppose We Don't Find SUSY?". AIP Conf.Proc. 753: 459–472. Bibcode:2005AIPC..753..459H. doi:10.1063/1.1896725.
  15. ↑ 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.
  16. ↑ 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.
  17. ↑ Ferreira, Pedro G.; Hill, Christopher T.; Ross, Graham G. (2018). "Inertial Spontaneous Symmetry Breaking and Quantum Scale Invariance". arXiv:1801.07676 [hep-th].
  18. ↑ Hill, Christopher T (2005). "Conjecture on the Physical Implications of the Scale Anomaly". arXiv:hep-th/0510177.
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