{"id":3105,"date":"2009-10-08T18:08:23","date_gmt":"2009-10-08T22:08:23","guid":{"rendered":"https:\/\/www.bu.edu\/tech\/research\/scv_import\/visualization\/gallery\/baryon\/"},"modified":"2023-05-23T23:09:58","modified_gmt":"2023-05-24T03:09:58","slug":"baryon","status":"publish","type":"page","link":"https:\/\/www.bu.edu\/tech\/support\/research\/whats-happening\/highlights\/baryon\/","title":{"rendered":"Baryon Number Violation"},"content":{"rendered":"
\"baryon\"\n<\/div>\n

Claudio Rebbi
\nDepartment of Physics and Center for Computational Science
\nBoston University
\nJune 1997<\/p>\n

Based on research by:<\/p>\n

G.F. Bonini, C. Rebbi Boston University
\nS. Habib, E. Mottola, LANL
\nR.Singleton, Jr. University of Washington
\nP.Tinyakov INR, Moscow<\/p>\n

The states of the electroweak theory are characterized by a topological number. Processes which change topology give origin to baryon number violation.<\/p>\n

The animations below illustrate the semiclassical description of a collision process. The flux of incoming particles is represented by the imploding wave, the outgoing particles by the exploding wave. The phase of the complex field is color coded. A rainbow pattern indicates that the phase winds around the unit circle and that the state has non-trivial topology.<\/p>\n

Video Sequences<\/h4>\n

<\/p>\n

\"baryon\"<\/div>\n

Video Sequence<\/a><\/p>\n

Sequence 1: Collision with an energy barely above the sphaleron barrier (E_sph) which separates states of different topology. The topology changes.<\/p>\n

<\/p>\n

\"baryon\"<\/div>\n

Video Sequence<\/a><\/p>\n

Sequence 2: Collision with energy larger than E_sph<\/strong> . No change of topology.<\/p>\n

<\/p>\n

\"baryon\"<\/div>\n

Video Sequence<\/a><\/p>\n

Sequence 3: Collision with E > E_sph<\/strong>. Topology change and reduced incoming particle number.<\/p>\n

<\/p>\n

\"baryon\"<\/div>\n

Video Sequence<\/a><\/p>\n

Sequence 4: Collision with energy below the sphaleron barrier. No change of topology.<\/p>\n

<\/p>\n

\"baryon\"<\/div>\n

Video Sequence<\/a><\/p>\n

Sequence 5: Collision with E < E_sph<\/strong> . The evolution is continued along the imaginary time axis. Change of topology occurs through tunneling.<\/p>\n

\n

Hardware:<\/strong> SGI Power Challenge Array and SGI Origin2000.
\nSoftware:<\/strong> Fortran 77, MPI. Visualization done using IRIS Performer.
\nGraphics programming assistance and video production:<\/strong> Erik Brisson and Kathleen Curry, Scientific Computing and Visualization Group, Boston University.
\nAcknowledgments:<\/strong> Research supported by the U.S. Department of Energy<\/p>\n","protected":false},"excerpt":{"rendered":"

Claudio Rebbi Department of Physics and Center for Computational Science Boston University June 1997 Based on research by: G.F. Bonini, C. Rebbi Boston University S. Habib, E. Mottola, LANL R.Singleton, Jr. University of Washington P.Tinyakov INR, Moscow The states of the electroweak theory are characterized by a topological number. Processes which change topology give origin…<\/p>\n","protected":false},"author":1692,"featured_media":0,"parent":57322,"menu_order":46,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.bu.edu\/tech\/wp-json\/wp\/v2\/pages\/3105"}],"collection":[{"href":"https:\/\/www.bu.edu\/tech\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.bu.edu\/tech\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.bu.edu\/tech\/wp-json\/wp\/v2\/users\/1692"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bu.edu\/tech\/wp-json\/wp\/v2\/comments?post=3105"}],"version-history":[{"count":18,"href":"https:\/\/www.bu.edu\/tech\/wp-json\/wp\/v2\/pages\/3105\/revisions"}],"predecessor-version":[{"id":145755,"href":"https:\/\/www.bu.edu\/tech\/wp-json\/wp\/v2\/pages\/3105\/revisions\/145755"}],"up":[{"embeddable":true,"href":"https:\/\/www.bu.edu\/tech\/wp-json\/wp\/v2\/pages\/57322"}],"wp:attachment":[{"href":"https:\/\/www.bu.edu\/tech\/wp-json\/wp\/v2\/media?parent=3105"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}