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What is new with Koide sum rules? 
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#91
Jan1213, 09:28 AM

PF Gold
P: 2,901

Given that a lot of Koide stuff seems related (hat tip to de Vries and Brannen here) to this matrix
[tex]\begin{pmatrix}\frac{2\,\mathrm{sin}\left( t\right) }{\sqrt{6}} & \frac{\mathrm{sin}\left( t\right) }{\sqrt{6}}+\frac{\mathrm{cos}\left( t\right) }{\sqrt{2}} & \frac{\mathrm{sin}\left( t\right) }{\sqrt{6}}\frac{\mathrm{cos}\left( t\right) }{\sqrt{2}}\cr \frac{2\,\mathrm{cos}\left( t\right) }{\sqrt{6}} & \frac{\mathrm{sin}\left( t\right) }{\sqrt{2}}\frac{\mathrm{cos}\left( t\right) }{\sqrt{6}} & \frac{\mathrm{sin}\left( t\right) }{\sqrt{2}}\frac{\mathrm{cos}\left( t\right) }{\sqrt{6}}\cr \frac{1}{\sqrt{3}} & \frac{1}{\sqrt{3}} & \frac{1}{\sqrt{3}}\end{pmatrix}[/tex] I have setup a wxMaxima notebook to play with it. Not that I like Maxima, I used it in a VAX and it was already superseded by REDUCE when Mathematica come. But it comes with Ubuntu and has a graphical interface, which Reduce has not. 


#92
Jan1313, 08:16 PM

P: 753



#93
Jan2013, 08:25 AM

P: 753

Since this is a Koide thread we have to mention Zenczykowski's latest, though it is about "family triples", and not what I call the "sequential triples" of the waterfall... He's still building on the generalization of the emutau 2/9 parameter to uct and dsb; he proposes that another parameter, which is just "1" for emutau, is also "1" for the quarks if you use Goffinet's concept of "pseudomass". If that's true it's a breakthrough, as well as a headache for the waterfall, because aren't we getting overloaded with too many relationships at once?
He mentions the usual problem, that these relations work best for lowenergy masses. We've previously discussed Sumino's efforts to have family gauge bosons cancel out certain QED corrections, so that Koide's relation may be exact; but I was always curious about whether there might be some dual description of physics, in which, rather than thinking of the UV as fundamental, you thought of the physics as "IR + new degrees of freedom at a series of higher energies"  the idea being that the cause of Koide relations might be more transparent in this hypothetical "infrared first" formulation. Well, I wonder if this paper by Davide Gaiotto (from January 2012) might be relevant: "Domain Walls for TwoDimensional Renormalization Group Flows". "Renormalization Group domain walls are natural conformal interfaces between two CFTs related by an RG flow. The RG domain wall gives an exact relation between the operators in the UV and IR CFTs." It seems a tiny step towards what I had in mind. 


#94
Jan2013, 03:28 PM

PF Gold
P: 2,901

A motivation to follow this track could be, put all the quarks in the faces of a cube, such that all the equations of the waterfall are the faces that meet in some vertex. You will notice that his cube has a property, that opposite faces have opposite weak isospin. You can also notice that we only need three equations to fix the faces. One of the vertexes of this cube is DSB, and of course is opposite vertex has the faces of the uptype quarks. This is the only axis that does not correspond to a waterfall symmetry, and on other hand the DUS vertex is the only axis which is used in both extremes. Going to discrete groups, S4 is the group of permutations of the four "Z3 axis" in a cube, while the subgroup S3 is contained in four notverydifferent ways, each of them being the permutations that keep one of such axis invariant (you can exchange fully the vertex by the opposite, to implement the Z2 subgroup of S3). 


#95
Jan2213, 09:54 AM

PF Gold
P: 2,901

The real problem of S4 is to know the physics content, the objects we are permuting. The suggestion of putting quarks (or leptons) in the faces of a cube is rarely seen in the literature.
About PZ and pseudomasses, I think it is not very different of the initial objections to HarariHautWeyers, they also do a similar trick, or a trick that can be interpreted as taking only the diagonal of the undiagonalised mass matrix. By the way, I note that the abbreviations 2/27 and 4/27 are first used by Sheppeard in her note 342 


#96
Jan2313, 12:31 AM

P: 753

The pseudomass adds up the contributions of all the mass eigenstates to one of the weak eigenstates. So it looks like "sequential" triples, like in the waterfall, apply to mass eigenstates, family triples (as in the original Koide formula) apply to weak eigenstates, and this wasn't noticed until recently because, for charged leptons, the weak eigenstates are the same as the mass eigenstates.
For the quarks, we can then think of the waterfall as the dominant chain of relationships, and then the mixing parameters encode the rotation away from waterfall mass values, required to produce family triples with 2n/27 phases. For the leptons, perhaps the family triples dominate, and a waterfall is weak or nonexistent. (I'm still not clear on whether righthanded neutrinos could have masses of the order of the quarks, as in #81, and then give rise to the observed small masses via seesaw.) p.s. Chris Quigg had a paper yesterday  "Beyond Confinement"  in which 2/27 shows up as the exponent in a relation between the top mass and the nucleon mass, in a unified theory! 


#97
Feb1213, 10:40 AM

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P: 2,901

I hated macsyma and I am transferring my hate to its free twin, maxima, but still this is interesting. I got again the waterfall while I was trying to solve for the full S4 symmetric set of Koide equations.
This is, I was trying to find mass values in the six faces of a cube such of for each vertex we have a Koide equation. The group of rotations of the cube is S4; imposing Koide explictly breaks the symmetry as it gives different values to different faces. Not a very convincing motivation, but ok to play a little bit. Now, in maxima. You define K(x,y,z):=x^2+y^2+z^24*(x*y+y*z+z*x); so that expand(K(x,y,z)*K(x,y,z)*K(x,y,z)*K(x,y,z)); is a degree 8 even polynomial on three variables; we put all of it
factor(eliminate([Q(1,x1,x2),Q(1,x2,x3)],[x2])) shows two terms that just validate x^2=x3^2. So in my first step I also canceled these factors:
four complete x1,x2,x3,x4,x1 cycles two sequences x1,x2,x3,x4 two sequences x1,x2,x3 The solutions for the waterfall triplets cbt and bcs appear in the list, numerically as sqrt(t)=10.12, sqrt(b)=1.464, sqrt(s)=0.267, with sqrt(c)=1, in one of the notclosing sequences. I guess I need an expert on discrete groups in order to understand what is going on. PS. wow, now I notice that Q surely is the trick that Goffinet uses to avoid the square roots somewhere in his thesis. 


#98
Feb1313, 03:54 PM

P: 753

Exciting progress!



#99
Feb1413, 04:18 AM

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P: 2,901

Page 70 (section 3.2.1).[/QUOTE]
Indeed it is the same polynomial.
Let me copy here this equation 3.30, setting the determinant of M as a function of the traces in M and M^2: [tex]M = {2 \over 3 * 32^2} {(7 (Tr M)^2  8 Tr M^2)^2 \over Tr M} [/tex] 


#100
Feb1513, 06:07 AM

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P: 2,901

The following Mathematica code will help to find the solutions to the S4 symmetric Koide system.
If this post is the only one you are going to read, remember that we are organising three generations in opposite faces of a cube, and each corner must agree with Koide equation. A way to solve this is to fix one face, say to unity, and then check to four corners of this face. Please use the code linebyline; it is listed here without EOF separators! Also, please verify that you select the non common factor in each step, the order could change between versions of Mathematica (this is done with version 9.0 in the free trial period)
It is amusing that the first triplet of the list is RodejohannZhang triplet, {1, {x > 102.50258, y > 2.1435935}}. Scale it times 174.1/102.50 and you get 1.69849, 174.1, 3.64088 My own triplet appears later, as it is generated by the last polynomial... it is 1, {x > 2.1435935, y > 0.071796770}. Use the same scale factor than before, and you get 1.69849, 3.64088, 0.12195 Both triplets are of the kind that becomes hidden in the continuous under Solve. I am not sure about why this resolvent method does not find solutions with a zero, for instance 1.69849, 0.12195, 0. They can be searched by starting from G[0, x, y2]==0, G[0, y2, x2]==0, G[0, x2, y]==0, G[0, y, x]==0



#101
Feb1513, 02:47 PM

P: 753

Two problems: first, the SM yukawas are complexvalued and underdetermined by the experimental data (PDG). One would need to decide if the elements of the matrix M are the SM yukawas or secondary quantities derived from them. Second, the larger blocks are there in order to produce family Koide triplets, as in Zenczykowski; but Z's Koide triplets are made of Goffinet's pseudomasses, which are obtained by applying the CKM matrix to a vector of masses. It's not clear to me whether or not the larger blocks should be transformed somehow, before the Goffinet property is imposed. 


#102
Feb2013, 08:59 AM

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P: 2,901

[tex]0 = {1 \over 1536} (252 m_0^2  8 Tr M^2)^2  6 m_0 Det(M)[/tex] 


#103
Jun313, 02:48 AM

P: 753

There is a very phenomenological paper from Koide (and colleague Ishida) today. It seems to be the first paper that talks about adapting Sumino's mechanism to the quarks.
But let's take a step back. Koide found his formula 30 years ago. Koide has proposed a number of fieldtheoretic models to explain it; so have a few other people (actually, who else has made a proper fieldtheoretic model, apart from Ernest Ma?). All QFT models of the relation have the problem that there should be deviations from the formula, because of quantum corrections, but empirically it is exact within error. Yukinari Sumino was the first person to develop a model in which the corrections are cancelled. It's a little complicated, but it involves a family symmetry that is gauged and then spontaneously broken. The heavy family gauge bosons do the cancelling of the corrections coming from QED. Koide and Yamagarbagea adapted Sumino's mechanism to supersymmetry. The present paper does not mention supersymmetry, but it does assume the modified version of Sumino's mechanism (in which the mass hierarchy of the family gauge bosons is inverted, compared to Sumino's original version). Koide and Ishida's inspiration is a tiny aberration in the data for B meson decays. I still haven't digested the paper, but they seem to say at the end that, naively, even a Sumino meson shouldn't be able to produce the dip (that may be there, or which may go away with more data). But there could be some enhancement, and, importantly for them, if the dip is due to their family bosons, then a corresponding dip will not appear in another particular measurement. From my perspective, this paper runs ahead of theory, because we still have no fieldtheoretic model of any of the generalized Koide relations for quarks, let alone adaptations of the Sumino mechanism for such models. Koide's own recent BSM work generally assumes that there's a nonet of scalars whose VEVs are diag(√m_{e},√m_{μ},√m_{τ}), and then he builds mass matrices for all the SM fermions out of couplings to these. It is from within this theoretical context that he will have guessed at the quark couplings with the Sumino mesons. Since the quarks have their own Koide relations, it seems very unlikely that their masses are produced in the manner of Koide's recent models. Still, it's always useful to have papers that go "too far ahead"  in this case, trying to interpret a known anomaly as a signal of quarksector Sumino mesons! Thinking about how the ideas in the paper work, may help those of us still struggling to find an approach to "Koide for quarks". 


#104
Aug313, 06:55 PM

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P: 2,901

A few months ago I sketched a report on the topic of predictions from Koide equation that could be more readable for people used to PhysRev latex format. It is here: http://es.scribd.com/doc/157932274/K...masstriplets



#105
Aug413, 05:33 AM

PF Gold
P: 2,901

Also, perhaps all the thing about sqrt(M) is a red herring. We could just contemplate a correction "susylike" going only up to order two,
[tex]M_i = (1 + \lambda_i + \lambda_i^2) M[/tex] and then Koide eq is the system [itex]Tr \lambda = 0[/itex], [itex] Tr (\lambda^2) = Tr(1)[/itex] 


#106
Aug613, 05:03 AM

P: 753

Maybe I'm stupid but I don't understand any of those equations. What matrices are [itex]M[/itex], [itex]M_i[/itex], [itex]\lambda_i[/itex]? What is the [itex]\lambda[/itex] in the final equations?
edit: Let me guess... The first quantities are all scalars. [itex]M[/itex] is a KoideBrannen mass scale, [itex]M_i[/itex] is the mass of the [itex]i[/itex]th member of the corresponding Koide triple, and [itex]\lambda[/itex] is a matrix with the [itex]\lambda_i[/itex]s as eigenvalues?? 


#107
Aug613, 09:33 AM

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P: 2,901

[tex]\lambda_1+ \lambda_2 +\lambda_3 =0[/tex] [tex]\lambda_1^2 +\lambda_2^2 +\lambda_3^2 =3[/tex] And I have forgot a factor 2, have I? It should be [tex]M_i=M (1 + 2\lambda_i + \lambda_i^2) = M (1 + \lambda_i)^2[/tex] Well, perhaps the importance of sqrt(M) is not a redherring, at all. 


#108
Aug2913, 05:52 AM

P: 753

There have been two new "yukawaon" papers.
Koide and Nishiura have made a substantial technical change, in order to make the familysymmetry interactions of the SM fermions anomalyfree (previously, new fields had to be introduced just to cancel the anomalies). Aulakh and Khosa produced "Grand Yukawonification", one of the few papers not by Koide that even mentions the yukawaon models. Actually their philosophy is rather different. If I am reading it correctly, this is a susy SO(10) model, in which GUT symmetry breaking is achieved by some very highdimensional representations (e.g. a Higgs with 126 components), and then some of these Higgs components are gauged under an SO(3) family symmetry, and the yukawas come from their VEVs. It would be edifying to compare and contrast what they do, and what Koide does. They call theirs a topdown approach, as opposed to Koide's bottomup approach. Koide introduced new yukawaon fields and a new scale for family symmetry breaking; they just put to work some of the components of the GUT Higgs, and the GUT scale is also the family scale. Also, it seems to me that their approach has something in common with the 1990 paper by Koide which was the first step towards yukawaons (for a very brief history, see this talk). In subsequent work, the SM yukawa terms are produced by operators coupling SM fermions, the usual SM Higgs, and the yukawaon VEVs, but in this paper from 1990, the masses come from direct couplings between SM fermions and yukawaon VEVs (I think). And this seems to be what Aulakh and Khosa are doing. The downside is that they are not explaining the Koide formula (or any of its generalizations)... 


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