(Mainly centered on theory developments)
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1 (Mainly centered on theory developments)
2 QCD axion Among energy pie, I will discuss axion in this part. Quintessential axion
3 From a fundamental point of view, i.e. when mass scale is created, presumably around the Planck scale, Natural mass scales are the Planck mass and/or some scales suppressed by small couplings, such as by fine structure constants. The Planck scale and GUT scale are considered to be natural. All smaller mass scales are better to come from symmetry arguments. Fermions by chiral symmetry and scalars by the Goldstone theorem. Beautiful! QM and arts.
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5 After Cronin et al paper, Need for a theory of weak CP violation : KM+ By Kobayashi- Maskawa
6 CP violation by many Higgs doublets At the time when the third quark family was not discovered, Weinberg tried to introduce the weak CP violation in the Higgs potential. Due to the GW theorem, he introduced two Higgs doublets, one coupling to the up quarks and the other coupling to the down quarks. His Higgs potential with multi Higgs fields is CP violation by Weinberg, including Yukawa of Hu and Hd couplings.
7 At the time when the third quark family was not discovered, Weinberg tried to introduce the weak CP violation in the Higgs potential. Due to the GW theorem, he introduced two Higgs doublets, one coupling to the up quarks and the other coupling to the down quarks. His Higgs potential with multi Higgs fields is A ha, then there appears a Removed by Peccei-Quinn U(1) global symmetry. The Peccei-Quinn symmetry.
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9 Fine-tuning problem in invisible axion KSVZ: VEV of sigma is f a. No fine-tuning problem. DFSZ: VEV of sigma for f a and electroweak scale v needs some fine-tuning. (Mixing term)/lambda (1,2) needs a fine-tuning of order A similar issue for WDM axino was studied here: Dreiner-Staub-Ubaldi, [hep-ph]
10 Supersymmetry KN term: M is determined from the theory. This term is the definition of the PQ symmetry.
11 The neutron EDM term. Pion VEV (CP violating) in the meson L can give theta-bar is less than
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14 If this is absent, it is called axion. And theta=0 is the minimum. If some term in V is present, theta=0 is not guaranteed to be the minimum.
15 A small allowed region Kim-Semertzidis-Tsujikawa, Front. Phys. 2 (2014) 60 U(1) anom forbidden If HI is greater than fa, there is the isocurvature constraint.
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17 L=2 L=-2 Q=2 Q=-2-1/
18 The Peccei-Quinn symmetry at low energy with SUSY is introduced in this way. Breaking the PQ symmetry in SUGRA is Kim, PLB136 (1984) 378. Most SUGRA models, breaking a global symmetry use this superpotential. Sometimes used in hybrid inflation also.
19 Wormholes: Gidding-Strominger, Coleman, Cline For PQ, Exact global symmetries? Barr-Seckel, Kamionkowski-MarchRussel, Holdom et al. Exclude terms up to dim 8. Discrete gauge symmetry: Krauss-Wilczek The example of acc symm.
20 Model-independent axion (Green-Schwarz, Witten) With Kiwoon Choi JEK, ; Tomorrow for this Forum
21 They are gauge fields in 10D. Their couplings to matter fields are from compactification process, including the Green-Schwarz term. If some of them give color anomaly coupling without anomalous U(1), they must be necessarily the hadronic axion-type. Anyway, their decay constants are above the GUT scale. Without fine tuning, it is expected that f a near the string scale. MI axion: Choi-K, PLB 154 (1985) 393; MD axion: Svrcek-Witten, JHEP 06 (2006) 051.
22 There can be terms in W, but the PQ symm breaking terms are absent. This can be achieved in compactification. The KN term is the leading one here.
23 Q=2 Q=-2 JEK, PLB 207 (1988) 434; JEK, PLB 735 (2014) 95, 741 (2014) 317. These use the anomalous U(1). In the heterotic string, there is only one anomalous U(1), with the exactly same coefficient for the gauge anomalies [Casas-Katehou-Munoz, NPB 317 (1989) 171; JEK, PLB 207 (1988) 434]. Intersecting brane models can have more, but the construction of the MSSM not done [Ibanez-Rabadan-Uranga, hep-th/ ].
24 Tomorrow Given in JEK, PRD 58 (1998) ; K-Carosi, RMP 82 (2010) 557. > = 2/3
25 Unification??? For MI-axion, the axion coupling is universal. So, one has the coupling. It is like in the unification theory.
26 On the figure of Kim-Semertzidis-Tsujikawa, Front. Phys. 2 (2014) 60
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31 Kim-Semertzidis-Tsujikawa, Front. Phys. 2, 60 (2014): Bosonic coherent motion review [Review in research topic BCM, New one: Frontiers in Physics, HE & astroparticle physics] BCM initiated by three groups in 83. BCM: (Preskill et al, Dine et al, Abbott et al.) BCM1 BCM2 Axion Inflaton CCtmp: Dark energy
32 Because of instanton solutions of QCD, there exists an effective interaction term G G-dual. It is the flavor singlet and the source of solving the U(1) problem of QCD: t Hooft, Phys. Rep. (1986). It proves that this term is physical, but leads to The strong CP problem, Why is the nedm so small? The remaining natural solution is very light axion.
33 theta-bar is less than
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36 But other matter fields can give Phi returns to its original value after a > a+ 2 pi N fa. N is the domain-wall number. [Sikivie (1982)]
37 Small string-dw are not problematic. The horizon scale string-dw system is problematic. Barr-Kim, PRL 113 (2014)
38 Vilenkin-Everett (1982); Barr-Choi-Kim (1987) Sikivie (1982)
39 Top-down approach, using string compactification 1. Anomalous U(1) gauge symmetry. 2. Anomalous U(1) becomes global U(1) below the GUT scale. 3. The global U(1) is broken at the axion window. 4. DW number here. By giving a VEV to NPQ=1 field, we obtain NDW=1. 5. Choi-Kim mechanism. For this we need a Goldstone boson direction
40 N 1 Choi-Kim mechanism Choi-Kim, PRL55 (1985) 2637 For the center of GUT group, Lazarides-Shafi (1982). But, the Goldstone idea is more widely applicable. 1. Torus identification 2. Goldstone-boson direction Max. common divisor of 2 and 3 is N DW = 1. N 2 1. Torus identification
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44 Axionic string contribution: It is important if strings are created after PQ symmetry breaking. With a high scale inflation, this string contribution has been considered. Probably, this is the most significant implication of BICEP2 result on axion physics, with DW number 1: Vissineli-Gondolo, Marsh et al, micro-ev??? But, it depends a calculation of axions from the system of string-domain walls. 1. Kamionkowski-March-Russel(1982) 2. Numerical estimates Florida group: 1 Cambridge group: O( ) Tokyo group: 25 This number is used
45 Kim-Marsh, PRD 93 (2016) [ [hep-ph]] Axion density=(1/10) CDM density H I = GeV Axion density=(1/10) CDM density f a = GeV possible.
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47 Constant B field E field follows the axion oscillation Axion detection scheme
48 Very light axion 1979 CDM candidate ADMX CAPP:??? Detection suggested 1983 Sikivie s cavity detector CAPP started 2013
49 The design requires the solution in axio-electrodynamics, given in Hong-K-Semetrtzidis, [hep-ph]: The record exists.
50 Cavity detectors: Axion detection is going on at ADMX: Seattle, USA CAPP: Daejeon, Korea 11 (Haloscope: cosmic axions, fa nea 19 GeV) Planned at IAXO: Spain (Helioscope: Solar axions, fa near 10 9 GeV) Vergados-Semertzidis, [ [astro-ph.ga]]
51 I find this very interesting since the value at origin is given by the symmetry. Kahn-Shafdi-Thaler, Sensitivity, for one year run (> axion coherence time) with signal/noise greater than 1, can be probed. Its scale is in the anthropic region.
52 Kahn-Shafdi-Thaler,
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