Christopher T. Hill

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 discussion of the two-Higgs-doublet model.[1]

Christopher T. Hill
Born (1951-06-19) June 19, 1951
Neenah, Wisconsin
NationalityAmerican
Alma materM.I.T.
Caltech
Known forTopcolor; Top quark condensate; Dimensional deconstruction; Chiral Dynamics of Heavy-Light Mesons; Theory of UHE Cosmic Rays; Soft Nambu-Goldstone Boson model of Dark Matter.
Scientific career
InstitutionsFermilab
Doctoral advisorMurray Gell-Mann

Hill has made contributions to dynamical theories of electroweak symmetry breaking, and is an originator of the top quark infrared fixed point,[2] top quark condensates,[3] topcolor,[4][5] and dimensional deconstruction.[6] and has coauthored an extensive review of strong dynamical theories.[7] He is also an originator of cosmological models of dark energy and dark matter based upon ultra-low mass bosons associated with neutrino masses and was first to propose that the cosmological constant is connected to the neutrino mass, as .[8] [9] He has also developed modern theories of the origin of ultra-high-energy nucleons and neutrinos from grand unification relics, such as cosmic strings.[10] [11][12][13]

Hill has made significant contributions to the theory of heavy-light mesons, which contain a heavy quark and a light anti-quark, and are systems that display a remarkable chiral dynamics (see chiral symmetry breaking). With coauthors, he developed the theory and correctly predicted an abnormally long-lived resonance, the and numerous decay modes which have been confirmed by experiment.[14] [15]

More recently he has focused on the idea that all fundamental mass scales may be associated with spontaneously broken scale symmetry, or (Weyl symmetry). The scale of gravity (Planck mass) and the inflationary phase of the ultra-early universe may be generated together as part of a unified phenomenon dubbed "inertial symmetry breaking."[16] [17]

Hill has recently speculated that Higgs bosons are composite objects held together by gravitation. Gravity can form mini black holes composed of ordinary quarks and leptons with the properties (quantum numbers) required by Higgs bosons, but very heavy. Quantum effects can make these states very light and they may then play the role of the standard model Higgs boson(s).[18] In this picture, the observed Higgs boson is a top anti-top quark bound state, and the theory predicts the existence of many sequential, heavier Higgs bosons (weak isodoublets), with "large" coupling constants to quarks and leptons. This may explain the puzzle of the many small parameters in the standard model. Several of these new heavy Higgs bosons may be accessible to the LHC in processes like (b and anti-b quark). [19] [20] [21]

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

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
  • Google Scholar Profile of Christopher T. Hill
gollark: You shouldn't have to worry that there may be nils anywhere.
gollark: My least favourite aspect about Go is the type system, which ties into the error handling.
gollark: It's like `null` but the same.
gollark: It tries to hide it by calling it `nil` but it's so stupid.
gollark: So is Rust. Use Rust.

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. Bardeen, William A.; Hill, Christopher T.; Lindner, Manfred (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. PMID 10012522.
  4. Hill, Christopher T. (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. S2CID 15093335.
  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, Christopher T.; Pokorski, Stefan; Wang, Jing (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.
  7. Hill, Christopher T.; Simmons, Elizabeth H. (2003). "Strong dynamics and electroweak symmetry breaking". Phys. Rep. 381 (4–6): 235. arXiv:hep-ph/0203079. Bibcode:2003PhR...381..235H. doi:10.1016/S0370-1573(03)00140-6. S2CID 118933166.
  8. Frieman, Joshua A.; Hill, Christopher T.; Stebbins, Albert; Waga, Ioav (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. S2CID 11755173.
  9. Hill, Christopher T.; Schramm, David N.; Fry, James N. (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. PMID 9955721.
  11. Hill, Christopher T.; Schramm, David N.; Walker, Terry P. (1987). "Ultrahigh-Energy Cosmic Rays from Superconducting Cosmic Strings". Phys. Rev. D. 36 (4): 1007–1016. Bibcode:1987PhRvD..36.1007H. doi:10.1103/physrevd.36.1007. PMID 9958264.
  12. Bhattacharjee, Pijushpani; Hill, Christopher T.; Schramm, David N. (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. hdl:2060/19920009031. PMID 10046974. S2CID 20633612.
  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. OSTI 1155484.
  14. Bardeen, William A.; Hill, Christopher T. (1994). "Chiral dynamics and heavy quark symmetry in a solvable toy field theoretic model". Physical Review D. 49 (1): 409–425. arXiv:hep-ph/9304265. Bibcode:1994PhRvD..49..409B. doi:10.1103/PhysRevD.49.409. PMID 10016779. S2CID 1763576.
  15. Bardeen, William A.; Eichten, Estia; Hill, Christopher T. (2003). "Chiral multiplets of heavy-light mesons". Physical Review D. 68 (5): 054024. arXiv:hep-ph/0305049. Bibcode:2003PhRvD.68.54024B. doi:10.1103/PhysRevD.68.054024. S2CID 10472717.
  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. S2CID 119269154.
  17. Ferreira, Pedro G.; Hill, Christopher T.; Ross, Graham G. (2018). "Inertial Spontaneous Symmetry Breaking and Quantum Scale Invariance". Physical Review D. 98 (11): 116012. arXiv:1801.07676. Bibcode:2018PhRvD..98k6012F. doi:10.1103/PhysRevD.98.116012. S2CID 119267087.
  18. Hill, Christopher T. (2020). "Composite Higgs bosons from Mini Black Holes". arXiv:2002.11547 [hep-ph].
  19. 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. S2CID 119192830.
  20. Hill, Christopher T.; Machado, Pedro; Thomsen, Anders; Turner, Jessica (2019). "Where are the Next Higgs Bosons?". Physical Review. D100 (1): 015051. arXiv:1904.04257. Bibcode:2019PhRvD.100a5051H. doi:10.1103/PhysRevD.100.015051. S2CID 104291827.
  21. Hill, Christopher T.; Machado, Pedro; Thomsen, Anders; Turner, Jessica (2019). "Scalar Democracy". Physical Review. D100 (1): 015015. arXiv:1902.07214. Bibcode:2019PhRvD.100a5015H. doi:10.1103/PhysRevD.100.015015. S2CID 119193325.
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