Freddy Cachazo

from Wikipedia, the free encyclopedia

Freddy Alexander Cachazo (* in Venezuela ) is a theoretical physicist living in Canada who studies string theory and related theories.

Cachazo studied among other things at the International Center for Theoretical Physics in Trieste in 1996 and received his doctorate in 2002 from Harvard University with Cumrun Vafa ( Dualities in field theory from geometric transitions in string theory ). From 2002 to 2005 and 2009/10 he was at the Institute for Advanced Study . He has been a scientist at the Perimeter Institute in Waterloo (Ontario) since 2005 , where he works with Nima Arkani-Hamed , among others .

In a series of works in 2004/05, he and colleagues revived the perturbation theory of the Yang-Mills theory and the old approach to high-energy physics of the 1960s via the scatter matrix in the complex. He used the knowledge that the scattering amplitudes in the perturbation theory for Yang-Mills theories have remarkable symmetries, which enable the establishment of recursion relations for the construction of the amplitudes in a higher order (BCFW recursion relations and CSW rules). Participants included Edward Witten , Ruth Britto, Bo Feng and Peter Svrcek. Their approach was an alternative to the analysis of the series of disorders with Feynman graphs. A new interpretation of the perturbation theory of Yang Mills theories on topological string theories in the Twistor space by Edward Witten (2004) was of essential importance . In 2012, Cachazo expanded this to include supergravity theories (with Yvonne Geyer, among others). Around 2009, together with Nima Arkani-Hamed , Jaroslav Trnka, Jacob Bourjaly and others, he discovered a geometric interpretation for the many symmetries discovered in the fault series in the form of a Grassmann manifold ( amplituhedron ).

In 2009 he received the Gribov Medal . In 2012 he received the Herzberg Medal of the Canadian Association of Physicists (CAP), in 2011 the Rutherford Memorial Medal, and in 2014 the New Horizons in Physics Prize . For 2016 he was awarded the CAP-CRM Prize .

Fonts (selection)

(except for the works cited in the footnotes)

  • with Ruth Britto, Bo Feng: Generalized unitarity and one-loop amplitudes in N = 4 super-Yang-Mills , Nucl.Phys. B, Volume 725, 2005, pp. 275-305, Arxiv
  • with Peter Svrcek: Lectures on Twistor Strings and Perturbative Yang-Mills-Theories , 2005, Arxiv
  • with Nima Arkani-Hamed, Jared Kaplan What is the simplest Quantum Field Theory? , 2008, Arxiv
  • with Nima Arkani-Hamed , Jacob L. Bourjaily, Simon Caron-Huot : The All-Loop Integrand For Scattering Amplitudes in Planar N = 4 SYM , JHEP 2011, Arxiv
  • with Nima Arkani-Hamed, Jacob Bourjaily, Jaroslav Trnka: Unification of Residues and Grassmannian Dualities , JHEP 2011, Arxiv
  • with Nima Arkani-Hamed, Jacob L. Bourjaily, Alexander Goncharov , Alexander Postnikov, Jaroslav Trnka: Scattering Amplitudes and the Positive Grassmannian , Arxiv
  • with Nima Arkani-Hamed, Jacob Bourjaily, Jaroslav Trnka: Local Spacetime Physics from the Grassmannian , JHEP 2011, Arxiv
  • with Nima Arkani-Hamed, Clifford Cheung, Jared Kaplan: A Duality For The S Matrix , JHEP, 2010, p. 1003: 020. Arxiv
  • with Song He, Ellis Ye Yuan: Scattering of Massless Particles in Arbitrary Dimensions , Phys. Rev. Lett., Volume 113, 2014, p. 171601, Arxiv
  • with Andrew Strominger : Evidence for a New Soft Graviton Theorem , Arxiv

Web links

  • Website at the Perimeter Institute

Individual evidence

  1. ^ First, Stephen J. Parke, Tomasz R. Taylor, Phys. Rev. Lett., Vol. 56, 1986, p. 2459, strictly derived from FA Berends, WT Giele Nucl. Phys. B, Volume 306, 1988, p. 759. They found that for the scattering amplitudes for the interaction of many gluons, those in which only a few gluons differ in helicity have particularly simple formulas (or even if there is a deviation in one or no gluon disappear), so-called maximally helicity violating (MHV) amplitudes. These MHV amplitudes were later used by Cachazo, Witten and colleagues as a building block for building up the series of disturbances.
  2. ↑ Britto, Cachazo, Feng, Witten Direct Proof Of Tree-Level Recursion Relation In Yang-Mills Theory , Phys. Rev. Lett., Vol. 94, 2005, 181602, Arxiv
  3. ↑ Cachazo, Svrcek, Witten MHV Vertices And Tree Amplitudes In Gauge Theory , J. High Energy Physics 2004, Arxiv
  4. ↑ Witten Perturbative Gauge Theory as String Theory in Twistor Space , Comm. Math. Phys., Vol. 252, 2004, pp. 189-258, Arxiv
  5. ↑ A "Twistor String" Inspired Formula For Tree-Level Scattering Amplitudes in N = 8 SUGRA , Preprint 2012
  6. ↑ Natalie Wolchover: A jewel in the heart of quantum physics , Simons Foundation 2013
personal data
SURNAME Cachazo, Freddy
ALTERNATIVE NAMES Cachazo, Freddy Alexander
BRIEF DESCRIPTION Venezuelan physicist
DATE OF BIRTH 20th century
PLACE OF BIRTH Venezuela