Cosmological Relaxation of the Electroweak Scale.

A new class of solutions to the electroweak hierarchy problem is presented that does not require either weak-scale dynamics or anthropics. Dynamical evolution during the early Universe drives the Higgs boson mass to a value much smaller than the cutoff. The simplest model has the particle content of the standard model plus a QCD axion and an inflation sector. The highest cutoff achieved in any technically natural model is 10^{8}  GeV.

[1]  Nathaniel Craig,et al.  Naturalness in the dark at the LHC , 2015, Journal of High Energy Physics.

[2]  R. Sundrum,et al.  Natural inflation and quantum gravity. , 2014, Physical review letters.

[3]  E. Shellard,et al.  Axion cosmology revisited , 2009, 0910.1066.

[4]  J. Pradler,et al.  Direct detection constraints on dark photon dark matter , 2014, 1412.8378.

[5]  A. Lobanov,et al.  Searching for WISPy Cold Dark Matter with a Dish Antenna , 2012, 1212.2970.

[6]  Savas Dimopoulos,et al.  The Hierarchy problem and new dimensions at a millimeter , 1998, hep-ph/9803315.

[7]  J. Juknevich.  Pure-glue hidden valleys through the Higgs portal , 2010 .

[8]  Gustavo Burdman,et al.  Colorless top partners, a 125 GeV Higgs boson, and the limits on naturalness , 2014, 1411.3310.

[9]  M. Pospelov,et al.  Probing new physics with underground accelerators and radioactive sources , 2014, 1405.4864.

[10]  Yue Zhao,et al.  Parametrically enhanced hidden photon search , 2014, 1407.4806.

[11]  L. Abbott.  A mechanism for reducing the value of the cosmological constant , 1985 .

[12]  A. Geraci,et al.  Resonantly detecting axion-mediated forces with nuclear magnetic resonance. , 2014, Physical review letters.

[13]  D. F. Kimball,et al.  Detecting domain walls of axionlike models using terrestrial experiments. , 2013, Physical review letters.

[14]  K. Irwin,et al.  Radio for hidden-photon dark matter detection , 2014, 1411.7382.

[15]  N. Kaloper,et al.  A natural framework for chaotic inflation. , 2008, Physical review letters.

[16]  J. Pradler,et al.  Dark matter detectors as dark photon helioscopes. , 2013, Physical review letters.

[17]  P. Graham,et al.  Axion dark matter detection with cold molecules , 2011, 1101.2691.

[18]  V. Flambaum,et al.  Nuclear spin-dependent interactions: searches for WIMP, axion and topological defect dark matter, and tests of fundamental symmetries , 2014, 1408.2184.

[19]  N. Kaloper,et al.  An ignoble approach to large field inflation , 2010, 1101.0026.

[20]  Andrei Linde,et al.  Hybrid inflation. , 1993, Physical review. D, Particles and fields.

[21]  Javier Redondo,et al.  Cosmological bounds on pseudo Nambu-Goldstone bosons , 2011, 1110.2895.

[22]  K. V. Tilburg,et al.  Searching for dilaton dark matter with atomic clocks , 2014, 1405.2925.

[23]  Savas Dimopoulos,et al.  Softly Broken Supersymmetry and SU(5) , 1981 .

[24]  Alexander Westphal,et al.  Monodromy in the CMB: Gravity Waves and String Inflation , 2008, 0803.3085.

[25]  P. Graham,et al.  New Observables for Direct Detection of Axion Dark Matter , 2013, 1306.6088.

[26]  I. M. Singer,et al.  Recent Developments in Gauge Theories , 1980 .

[27]  S. Weinberg.  A new light boson , 1978 .

[28]  V. Flambaum,et al.  Axion-induced effects in atoms, molecules, and nuclei: Parity nonconservation, anapole moments, electric dipole moments, and spin-gravity and spin-axion momentum couplings , 2013, 1312.6667.

[29]  Leonard Susskind,et al.  Dynamics of Spontaneous Symmetry Breaking in the Weinberg-Salam Theory , 1979 .

[30]  L. Randall,et al.  A Large mass hierarchy from a small extra dimension , 1999, hep-ph/9905221.

[31]  P. Sikivie.  Experimental Tests of the "INVISIBLE" Axion , 1983 .

[32]  G. Kane,et al.  Perspectives on LHC physics , 2008 .

[33]  Liam McAllister,et al.  Gravity Waves and Linear Inflation from Axion Monodromy , 2008, 0808.0706.

[34]  F. Wilczek.  Problem of Strong $P$ and $T$ Invariance in the Presence of Instantons , 1978 .

[35]  B. Döbrich,et al.  Extracting hidden-photon dark matter from an LC-circuit , 2014, 1411.4986.

[36]  A. Ringwald,et al.  WISPy cold dark matter , 2012, 1201.5902.

[37]  D B Tanner,et al.  SQUID-based microwave cavity search for dark-matter axions. , 2009, Physical review letters.

[38]  M. Pospelov,et al.  Hunting for topological dark matter with atomic clocks , 2013, Nature Physics.

[39]  S einberg,et al.  Implications of dynamical symmetry breaking: An addendum , 2011 .

[40]  Dmitry Budker,et al.  Proposal for a Cosmic Axion Spin Precession Experiment (CASPEr) , 2013, 1306.6089.