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Analytic derivation of an approximate SU(3) symmetry inside the symmetry triangle of the Interacting Boson Approximation model  [PDF]
Dennis Bonatsos,S. Karampagia,R. F. Casten
Physics , 2011, DOI: 10.1103/PhysRevC.83.054313
Abstract: Using the contraction of the SU(3) algebra to the algebra of the rigid rotator in the large boson number limit of the Interacting Boson Approximation (IBA) model, a line is found inside the symmetry triangle of the IBA, along which the SU(3) symmetry is preserved. The line extends from the SU(3) vertex to near the critical line of the first order shape/phase transition separating the spherical and prolate deformed phases, and lies within the Alhassid--Whelan arc of regularity, the unique valley of regularity connecting the SU(3) and U(5) vertices amidst chaotic regions. In addition to providing an explanation for the existence of the arc of regularity, the present line represents the first example of an analytically determined approximate symmetry in the interior of the symmetry triangle of the IBA. The method is applicable to algebraic models possessing subalgebras amenable to contraction. This condition is equivalent to algebras in which the equilibrium ground state (and its rotational band) become energetically isolated from intrinsic excitations, as typified by deformed solutions to the IBA for large numbers of valence nucleons.
New relations for the old triangle  [PDF]
Boris Safin
Mathematics , 2013,
Abstract: In this note we show that in addition to two integers forming a Pythagorean triple, there also exist two irrational numbers in terms of which this Pythagorean triple can also be obtained. We also put forward a relation between these two pairs and the hypotenuse of a Pythagorean triangle.
Using symmetry to generate solutions to the Helmholtz equation inside an equilateral triangle  [PDF]
Nathaniel Stambaugh,Mark Semon
Physics , 2013,
Abstract: We prove that every solution of the Helmholtz equation within an equilateral triangle, which obeys the Dirichlet conditions on the boundary, is a member of one of four symmetry classes. We then show how solutions with different symmetries, or different energies, can be generated from any given solution using symmetry operators or a differential operator derived from symmetry considerations. Our method also provides a novel way of generating the ground state solution (that is, the solution with the lowest energy). Finally, we establish a correspondence between solutions in the equilateral and (30,60, 90) triangles.
Nondegeneracy of Solution to the Allen-Cahn Equation with Regular Triangle Symmetry  [PDF]
Yong Liu, Jun Wang
Advances in Pure Mathematics (APM) , 2014, DOI: 10.4236/apm.2014.44017

The Allen-Cahn equation on the plane has a 6-end solution U with regular triangle symmetry. The angle between consecutive nodal lines of U is \"\". We prove in this paper that U is non-degenerated in the class of functions possessing regular triangle symmetry. As an application, we show the existence of a family of solutions close to U.

A Symmetry Pattern of Maximal CP-Violation and a Determination of the Unitarity Triangle  [PDF]
Harald Fritzsch,Zhi-zong Xing
Physics , 1995, DOI: 10.1016/0370-2693(95)00545-V
Abstract: Within a specific texture of the quark mass matrix the notion of a maximal violation of the $CP$ symmetry can be defined. The experimental constraints from weak decays imply that in reality one is close to the case of maximal $CP$ violation, which vanishes as the mass of the $u$--quark approaches zero. The unitarity triangle of the Cabibbo--Kobayashi--Maskawa matrix elements is determined. It is related to the triangle relating the Cabibbo angle to the quark mass ratios in the complex plane. The angle $\alpha $ describing the $CP$ violation in the decay $B_d \rightarrow \pi^+ \pi^-$ is close to 90$^{\circ }$.
Time Correlation Functions of Three Classical Heisenberg Spins on an Isosceles Triangle and on a Chain: Strong Effects of Broken Symmetry  [PDF]
Marco Ameduri,Richard A. Klemm
Physics , 2001, DOI: 10.1103/PhysRevB.66.224404
Abstract: At arbitrary temperature $T$, we solve for the dynamics of single molecule magnets composed of three classical Heisenberg spins either on a chain with two equal exchange constants $J_1$, or on an isosceles triangle with a third, different exchange constant $J_2$. As $T\rightrarrow\infty$, the Fourier transforms and long-time asymptotic behaviors of the two-spin time correlation functions are evaluated exactly. The lack of translational symmetry on a chain or an isosceles triangle yields time correlation functions that differ strikingly from those on an equilateral trinagle with $J_1=J_2$. At low $T$, the Fourier transforms of the two autocorrelation functions with $J_1\ne J_2$ show one and four modes, respectively. For a semi-infinite $J_2/J_1$ range, one mode is a central peak. At the origin of this range, this mode has a novel scaling form.
The triangle and the open triangle  [PDF]
Gady Kozma
Mathematics , 2009,
Abstract: We show that for percolation on any transitive graph, the triangle condition implies the open triangle condition.
Yang Hui Triangle symmetry and higher-order differential equations of motion

Shi Yong,Ma Shan-Jun,

物理学报 , 2006,
Abstract: In this paper, by using Mathematica software to disclose the relationship between partial derivative and high-order derivative of different variables in the function r=r(q(t),t), the symmetry of Yang Hui Triangle of the function r=r(q(t),t) is discovered. Combining the symmetry of Yang Hui triangle with the Newtonian second law, the high-order differential equations of motion are deduced. Finally the high-order differential equations of systems under ideal constraints are discussed.
Investigations of the broken SU(3) symmetry in deformed even-even nuclei  [PDF]
N. Minkov,S. Drenska,P. Raychev,R. Roussev,Dennis Bonatsos
Physics , 1997,
Abstract: A collective vector-boson model with broken SU(3) symmetry is applied to several deformed even-even nuclei. The model description of ground and $\gamma$ bands together with the corresponding B(E2) transition probabilities is investigated within a broad range of SU(3) irreducible representations (irreps) $(\lambda ,\mu )$. The SU(3)-symmetry characteristics of rotational nuclei are analyzed in terms of the bandmixing interactions.
Theoretical investigations of isoscalar, isovector and mixed symmetry states in skin nuclei  [PDF]
N. Tsoneva,H. Lenske
Physics , 2009, DOI: 10.1063/1.3087056
Abstract: We present recent investigations on dipole and quadrupole excitations in spherical skin nuclei, particular exploring their connection to the thickness of the neutron skin. Our theoretical method relies on density functional theory, which provides us with a proper link between nuclear many-body theory of the nuclear ground state and its phenomenological description. For the calculation of the nuclear excited states we apply QPM theory. A new quadrupole mode related to pygmy quadrupole resonance (PQR) in tin isotopes is suggested.
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