Weights of $SUleft(5right)$ representation












1














Consider the representation $Lambda^2V$ of $suleft(5right)$ where $V$ is the fundamental representation. How can I work out the Dynkin labels of its weights?



Are these the correct Dynkin labels for the weights of $V$:
$$left(1,0,0,0right),left(-1,1,0,0right),left(0,-1,1,0right),left(0,0,-1,1right),left(0,0,0,-1right)$$






representation-theory lie-groups lie-algebras







share|cite|improve this question



























    1














    Consider the representation $Lambda^2V$ of $suleft(5right)$ where $V$ is the fundamental representation. How can I work out the Dynkin labels of its weights?



    Are these the correct Dynkin labels for the weights of $V$:
    $$left(1,0,0,0right),left(-1,1,0,0right),left(0,-1,1,0right),left(0,0,-1,1right),left(0,0,0,-1right)$$






    representation-theory lie-groups lie-algebras







    share|cite|improve this question

























      1












      1








      1


      1





      Consider the representation $Lambda^2V$ of $suleft(5right)$ where $V$ is the fundamental representation. How can I work out the Dynkin labels of its weights?



      Are these the correct Dynkin labels for the weights of $V$:
      $$left(1,0,0,0right),left(-1,1,0,0right),left(0,-1,1,0right),left(0,0,-1,1right),left(0,0,0,-1right)$$






      representation-theory lie-groups lie-algebras







      share|cite|improve this question













      Consider the representation $Lambda^2V$ of $suleft(5right)$ where $V$ is the fundamental representation. How can I work out the Dynkin labels of its weights?



      Are these the correct Dynkin labels for the weights of $V$:
      $$left(1,0,0,0right),left(-1,1,0,0right),left(0,-1,1,0right),left(0,0,-1,1right),left(0,0,0,-1right)$$






      representation-theory lie-groups lie-algebras




      representation-theory lie-groups lie-algebras






      share|cite|improve this question













      share|cite|improve this question











      share|cite|improve this question




      share|cite|improve this question










      asked Nov 28 '18 at 11:23









      Joshua Tilley

      549313




      549313






















          1 Answer
          1






          active

          oldest

          votes


















          1














          Pick a basis $v_1, ldots, v_5$ for $V$, where $g in SU(5)$ acts by matrices. Then the maximal torus $T$ of diagonal matrices in $SU(5)$ acts on $V$ as well, and this representation is completely reducible, and decomposes as $mathbb{C}v_1 oplus cdots oplus mathbb{C}v_5$. The action of $(t_1, ldots, t_5)$ on $v_1$ is $(t_1, ldots, t_5) cdot v_1 = t_1 v_1$, which we could call the character $(1, 0, 0, 0, 0)$. All the other characters are similar, for example the action on $v_3$ is by the character $(0, 0, 1, 0, 0)$. Note also that since $t_1 cdots t_5 = 1 in T$, these characters are only given up to shift by $(1, 1, 1, 1, 1)$.



          Now, for $bigwedge^2 V$, you can do exactly the same thing. It has a basis $v_1 wedge v_2, v_1 wedge v_3, ldots, v_4 wedge v_5$, and the action of $T$ on $v_1 wedge v_2$ is by $(t_1, ldots, t_5) cdot (v_1 wedge v_2) = t_1 v_1 wedge t_2 v_2$, which is the character $(1, 1, 0, 0, 0)$. You can work out the others.






          share|cite|improve this answer





















            Your Answer





            StackExchange.ifUsing("editor", function () {
            return StackExchange.using("mathjaxEditing", function () {
            StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
            StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
            });
            });
            }, "mathjax-editing");

            StackExchange.ready(function() {
            var channelOptions = {
            tags: "".split(" "),
            id: "69"
            };
            initTagRenderer("".split(" "), "".split(" "), channelOptions);

            StackExchange.using("externalEditor", function() {
            // Have to fire editor after snippets, if snippets enabled
            if (StackExchange.settings.snippets.snippetsEnabled) {
            StackExchange.using("snippets", function() {
            createEditor();
            });
            }
            else {
            createEditor();
            }
            });

            function createEditor() {
            StackExchange.prepareEditor({
            heartbeatType: 'answer',
            autoActivateHeartbeat: false,
            convertImagesToLinks: true,
            noModals: true,
            showLowRepImageUploadWarning: true,
            reputationToPostImages: 10,
            bindNavPrevention: true,
            postfix: "",
            imageUploader: {
            brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
            contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
            allowUrls: true
            },
            noCode: true, onDemand: true,
            discardSelector: ".discard-answer"
            ,immediatelyShowMarkdownHelp:true
            });


            }
            });














            draft saved

            draft discarded


















            StackExchange.ready(
            function () {
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3017031%2fweights-of-su-left5-right-representation%23new-answer', 'question_page');
            }
            );

            Post as a guest















            Required, but never shown

























            1 Answer
            1






            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            1














            Pick a basis $v_1, ldots, v_5$ for $V$, where $g in SU(5)$ acts by matrices. Then the maximal torus $T$ of diagonal matrices in $SU(5)$ acts on $V$ as well, and this representation is completely reducible, and decomposes as $mathbb{C}v_1 oplus cdots oplus mathbb{C}v_5$. The action of $(t_1, ldots, t_5)$ on $v_1$ is $(t_1, ldots, t_5) cdot v_1 = t_1 v_1$, which we could call the character $(1, 0, 0, 0, 0)$. All the other characters are similar, for example the action on $v_3$ is by the character $(0, 0, 1, 0, 0)$. Note also that since $t_1 cdots t_5 = 1 in T$, these characters are only given up to shift by $(1, 1, 1, 1, 1)$.



            Now, for $bigwedge^2 V$, you can do exactly the same thing. It has a basis $v_1 wedge v_2, v_1 wedge v_3, ldots, v_4 wedge v_5$, and the action of $T$ on $v_1 wedge v_2$ is by $(t_1, ldots, t_5) cdot (v_1 wedge v_2) = t_1 v_1 wedge t_2 v_2$, which is the character $(1, 1, 0, 0, 0)$. You can work out the others.






            share|cite|improve this answer


























              1














              Pick a basis $v_1, ldots, v_5$ for $V$, where $g in SU(5)$ acts by matrices. Then the maximal torus $T$ of diagonal matrices in $SU(5)$ acts on $V$ as well, and this representation is completely reducible, and decomposes as $mathbb{C}v_1 oplus cdots oplus mathbb{C}v_5$. The action of $(t_1, ldots, t_5)$ on $v_1$ is $(t_1, ldots, t_5) cdot v_1 = t_1 v_1$, which we could call the character $(1, 0, 0, 0, 0)$. All the other characters are similar, for example the action on $v_3$ is by the character $(0, 0, 1, 0, 0)$. Note also that since $t_1 cdots t_5 = 1 in T$, these characters are only given up to shift by $(1, 1, 1, 1, 1)$.



              Now, for $bigwedge^2 V$, you can do exactly the same thing. It has a basis $v_1 wedge v_2, v_1 wedge v_3, ldots, v_4 wedge v_5$, and the action of $T$ on $v_1 wedge v_2$ is by $(t_1, ldots, t_5) cdot (v_1 wedge v_2) = t_1 v_1 wedge t_2 v_2$, which is the character $(1, 1, 0, 0, 0)$. You can work out the others.






              share|cite|improve this answer
























                1












                1








                1






                Pick a basis $v_1, ldots, v_5$ for $V$, where $g in SU(5)$ acts by matrices. Then the maximal torus $T$ of diagonal matrices in $SU(5)$ acts on $V$ as well, and this representation is completely reducible, and decomposes as $mathbb{C}v_1 oplus cdots oplus mathbb{C}v_5$. The action of $(t_1, ldots, t_5)$ on $v_1$ is $(t_1, ldots, t_5) cdot v_1 = t_1 v_1$, which we could call the character $(1, 0, 0, 0, 0)$. All the other characters are similar, for example the action on $v_3$ is by the character $(0, 0, 1, 0, 0)$. Note also that since $t_1 cdots t_5 = 1 in T$, these characters are only given up to shift by $(1, 1, 1, 1, 1)$.



                Now, for $bigwedge^2 V$, you can do exactly the same thing. It has a basis $v_1 wedge v_2, v_1 wedge v_3, ldots, v_4 wedge v_5$, and the action of $T$ on $v_1 wedge v_2$ is by $(t_1, ldots, t_5) cdot (v_1 wedge v_2) = t_1 v_1 wedge t_2 v_2$, which is the character $(1, 1, 0, 0, 0)$. You can work out the others.






                share|cite|improve this answer












                Pick a basis $v_1, ldots, v_5$ for $V$, where $g in SU(5)$ acts by matrices. Then the maximal torus $T$ of diagonal matrices in $SU(5)$ acts on $V$ as well, and this representation is completely reducible, and decomposes as $mathbb{C}v_1 oplus cdots oplus mathbb{C}v_5$. The action of $(t_1, ldots, t_5)$ on $v_1$ is $(t_1, ldots, t_5) cdot v_1 = t_1 v_1$, which we could call the character $(1, 0, 0, 0, 0)$. All the other characters are similar, for example the action on $v_3$ is by the character $(0, 0, 1, 0, 0)$. Note also that since $t_1 cdots t_5 = 1 in T$, these characters are only given up to shift by $(1, 1, 1, 1, 1)$.



                Now, for $bigwedge^2 V$, you can do exactly the same thing. It has a basis $v_1 wedge v_2, v_1 wedge v_3, ldots, v_4 wedge v_5$, and the action of $T$ on $v_1 wedge v_2$ is by $(t_1, ldots, t_5) cdot (v_1 wedge v_2) = t_1 v_1 wedge t_2 v_2$, which is the character $(1, 1, 0, 0, 0)$. You can work out the others.







                share|cite|improve this answer












                share|cite|improve this answer



                share|cite|improve this answer










                answered Nov 28 '18 at 22:16









                Joppy

                5,563420




                5,563420






























                    draft saved

                    draft discarded




















































                    Thanks for contributing an answer to Mathematics Stack Exchange!


                    • Please be sure to answer the question. Provide details and share your research!

                    But avoid …



                    • Asking for help, clarification, or responding to other answers.

                    • Making statements based on opinion; back them up with references or personal experience.


                    Use MathJax to format equations. MathJax reference.


                    To learn more, see our tips on writing great answers.





                    Some of your past answers have not been well-received, and you're in danger of being blocked from answering.


                    Please pay close attention to the following guidance:


                    • Please be sure to answer the question. Provide details and share your research!

                    But avoid …



                    • Asking for help, clarification, or responding to other answers.

                    • Making statements based on opinion; back them up with references or personal experience.


                    To learn more, see our tips on writing great answers.




                    draft saved


                    draft discarded














                    StackExchange.ready(
                    function () {
                    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3017031%2fweights-of-su-left5-right-representation%23new-answer', 'question_page');
                    }
                    );

                    Post as a guest















                    Required, but never shown





















































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown

































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown







                    -

                    Popular posts from this blog

                    Ellipse (mathématiques)

                    Image
                    Pour les articles homonymes, voir Ellipse. L'ellipse est le lieu des points dont la somme des distances à deux points fixes, dits foyers, est constante. Section du cône ou projection du cercle. En géométrie, une ellipse est une courbe plane fermée obtenue par l’intersection d’un cône de révolution avec un plan, à condition que celui-ci coupe l'axe de rotation du cône ou du cylindre : c'est une conique d'excentricité strictement comprise entre 0 et 1. On peut également la définir comme le lieu des points dont la somme des distances à deux points fixes, dits foyers, est constante (sa construction par la méthode du jardinier est très simple). Dans la vie courante, l’ellipse est la forme qu'on perçoit en regardant un cercle en perspective, ou la figure formée par l’ombre d'un disque sur une surface plane. On retrouve aussi, en première approximation [ 1 ] , des ellipses dans les trajectoires des corps célestes (planètes, comètes ou satellites arti...
                    Read more

                    Quarter-circle Tiles

                    Image
                    up vote 0 down vote favorite I have $99$ identical square tiles, each with a quarter-circle drawn on it like this: [asy] size(1.5cm); draw(Arc((2,0),1,90,180),red+1); draw((0,0)--(2,0)--(2,2)--(0,2)--(0,0)); [/asy] When I arrange the tiles in a $9times 11$ rectangular grid, each with a random orientation, what is the expected value of the number of full circles I form? I think this problem has to do with finding the chance any given 2x2 square has a circle, but I can't find it. expected-value share | cite | improve this question asked Nov 20 at 15:03 6minecraftninja 1 2 ...
                    Read more

                    Mont Emei

                    Image
                    Mont Emei.mw-parser-output .entete.map{background-image:url("//upload.wikimedia.org/wikipedia/commons/7/7a/Picto_infobox_map.png")} Vue du sommet Wanfo du mont Emei Géographie Altitude 3 099  m , Wanfo Coordonnées 29° 31′ 11″ nord, 103° 19′ 57″ est Administration Pays   Chine Province Sichuan Ville-préfecture Leshan Géolocalisation sur la carte : Sichuan Mont Emei Géolocalisation sur la carte : Chine Mont Emei modifier   Paysage panoramique du mont Emei, incluant le paysage panoramique du grand Bouddha de Leshan *   Patrimoine mondial de l'UNESCO Passerelle en bois sur le versant ouest Pays   Chine Subdivision Sichuan Type Mixte Critères (iv) (vi) (x) Superficie 15 400 ha Numéro d’identification 779 Zone géographique Asie et Pacifique  ** Année d’inscription 1996 (20 e session) * Descriptif officiel UNESCO ** Classification géog...
                    Read more