125GeV Higgs Boson --Cosmological viewpoint--
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125GeV Higgs Boson --Cosmological viewpoint--
Harigaya, Nagata, Hisano, Kikukawa, Takayama, Tanabashi, Yamanaka
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ルール• 125GeV ヒッグスを宇宙論の観点で考える 「???」という問題を真剣に考えると次に見えるのは「???」実験で「???」である。• Higgs Portal Dark Matter (Nagata)• Higgs Portal(?) Dark Radiation (Harigaya)• Electroweak Baryogenesis (Hisano)• Higgs Inflation (Yamanaka)
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P.Giardino, K.Kannike, M.Raidal, A.Strumia, arXiv: 1203. 4254
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Invisible decay width
Partial Decay Width
SM の Global fit から 2σ までずれてもよいとする
P.Giardino, K.Kannike, M.Raidal, A.Strumia, arXiv: 1203. 4254
Nagata
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S.Kanemura, S.Matsumoto, T. Nabeshima, and N.Okada (2010)
Coupling に対する制限
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Dark Radiation
Harigaya
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Dark Radiation
WMAP7 + ACBAR + ACT + SPR + SDSS-DR7
€
Neff = 4.08 ±0.710.68
(95% CL)
M. Archidiacono, E. Calabrese and A. Melchiorri hep-ph 1109.2767
€
ρrad = (1+78
(411
)43Neff )ργ
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背後にあるエネルギースケールを知りたいとりあえず MeV scale での effective operator を書いてみる
scalar
fermion
Thermal abundance を仮定して、 cut off はいくらか?etc.
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エネルギースケールOparators
TeV
TeV
10^15 GeV
10 GeV
10^8 GeV
TeV
10 GeV
eV
Decoupling temperature ~10MeV,
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TeV -> Higgs ?
質量が出ない様に全オーダーで tune
>~>~
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Higgs invisible decay からの制限
>~
>~
ずれが見えるかも !?
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Electroweak baryogenesis
サハロフの 3 条件1,バリオン数の破れ ← 電弱量子異常 2, CP の破れ ← とりあえず新物理を仮定3,熱平衡からのズレ ← 一次の電弱相転移
Hisano
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Triple vertex in 2HDM
Kanemura et al,Phys.Lett. B606 (2005) 361-366
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Color assisted EWBG Cohen et al1203.2924 [hep-ph]
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Higgs inflation とは?
メリット 1: SM particle contents のみで説明可能メリット 2: Higgs の物理を明らかにすることで地上実験にて検証可能
「 Higgs = inflaton 」とした slow-roll 型 inflation scenario
Action
: Ricci scalar
重力との大きな値を持つ non-minimal coupling を導入することにより、slow-rolling と初期揺らぎの生成を実現[F. Berzukovand and M.Shaposhinikov, arXiv:0710.3755]
Yamanaka
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125GeV Higgs mass との相性は?
: theoretical uncertainty from higher order corrections
125GeV Higgs はギリギリ OK
SM coupling の running を含めて、 effective Planck mass や Potential のrunning
n < 0.99 を出せる Higgs mass ( 実際には l) の領域に予言s
Tree level Higgs inflation では、 n は標準模型パラメーターに依存せず一定 s
Higgs mass に予言与えず、地上実験での検証も困難
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125GeV Higgs mass との相性は?[ A. Simone, M. Hertzberg, and F. Wilczek , arXiv:0812.4946]
宇宙観測から課されている制限
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Spectral indexと Higgs mass
[ F. Bezrukov and M. Shaposhnikov arXiv:0904.1537 ]
[ A. Simone, M. Hertzberg, and F. Wilczek arXiv:0812.4946]
Running order や繰り込みの手法に大きく依存し、結果が全く異なる125GeV Higgs が confirm され、 Higgs inflation を信じるなら、計算方法を詰めるべき
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補足 (n_s 計算の両者の違い )
Comment from A. Simone, M. Hertzberg, and F. Wilczek arXiv:0812.4946
Ref. [32] = [ F. Bezrukov and M. Shaposhnikov arXiv:0904.1537 ]