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Quantum Field Theory Across the Energy Frontier

Applicant Rattazzi Riccardo
Number 150060
Funding scheme Project funding
Research institution Laboratoire de physique théorique des particules EPFL - SB - ITP - LPTP
Institution of higher education EPF Lausanne - EPFL
Main discipline Theoretical Physics
Start/End 01.12.2013 - 30.11.2016
Approved amount 489'310.00
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All Disciplines (2)

Discipline
Theoretical Physics
Particle Physics

Keywords (8)

Electroweak Symmetry Breaking; Effective Field Theory; Standard Model ; Supersymmetry; LHC Phenomenology; Conformal Field Theory; Renormalization Group Flows; Cosmology

Lay Summary (Italian)

Lead
La Teoria Quantistica dei Campi (QFT) é il l’apparato matematico che descrive le particelle elementari e le loro interazioni. Il Modello Standard (MS) é una QFT di straordinaria adeguatezza empirica. Ma il MS non spiega alcuni fatti, come l'esistenza della materia oscura. Inoltre la dinamica associata al bosone di Higgs é sorgente del noto ``paradosso della gerarchia''. I problemi aperti hanno stimolato un grande sviluppo teorico nella QFT, con impatto in altri campi della fisica.
Lay summary

Il progetto ha  tre obiettivi. Il primo, é  di esplorare i  confini della QFT, per capire quali strutture siano compatibili coi principi di base.  Si approfondiranno  recenti progressi  nella comprensione del comportamento microscopico e macroscopico delle QFT. Inoltre si cercherá di construire nuovi esempi espliciti di teorie conformi, che sono un sempio interessante di comportamento micro- e macro-scopico. Il soggetto é rilevante per  l'estrapolazione del MS a scale di lunghezza piú piccole di quelle esplorate fino ad'ora. Un secondo obiettivo é scoprire quale sia la dinamica che si cela dietro il bosone di Higgs. In questo progetto si studieranno le implicazioni di due scenari plausibili, la supersimmetria e la compositezza, per guidare le ricerche sperimentali a LHC. In particolare si studieranno le segnature sperimentali di nuovi quark pesanti con carica elettrica inusuale. Si studierá anche la relazione tra le osservazioni a LHC e l'origine della materia nell'universo primordiale.Un terzo obiettivo concerne invece l'applicazione di metodi moderni di teoria di campo allo studio dei fluidi, che  sono che una classe specifica di teorie di campo. Verrá  data una classificazione dei fluidi o dei solidi in base alle loro proprietá di simmetria. É  concepibile che non tutte le possibilitá siano realizzate in natura. Se questo sará il caso   si cercherá di comprenderne la ragione. 

La ricerca svolta in questo progetto estenderá la base teorica della fisica delle alte energie. In questo modo si fornirá   un supporto, potenzialmente cruciale, ad una  comunitá  fortemente impegnata con LHC e in procinto di progettare il futuro della disciplina.

Direct link to Lay Summary Last update: 19.11.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Constraints on Perturbative RG Flows in Six Dimensions
Stergiou Andreas, Stone David, Vitale Lorenzo (2016), Constraints on Perturbative RG Flows in Six Dimensions, in JHEP, 0.
Hamiltonian truncation study of the $ϕ^4$ theory in two dimensions. II. The $\mathbb Z_2$ -broken phase and the Chang duality
Rychkov Slava, Vitale Lorenzo (2016), Hamiltonian truncation study of the $ϕ^4$ theory in two dimensions. II. The $\mathbb Z_2$ -broken phase and the Chang duality, in JHEP, 0.
Patterns of Strong Coupling for LHC Searches
Liu Da, Pomarol Alex, Rattazzi Riccardo, Riva Francesco (2016), Patterns of Strong Coupling for LHC Searches, in JHEP, 11, 141-141.
The RG-improved Twin Higgs effective potential at NNLL
Greco Davide, Mimouni Kin (2016), The RG-improved Twin Higgs effective potential at NNLL, in JHEP, 0.
Hamiltonian truncation study of the $?^4$ theory in two dimensions
Rychkov Slava, Vitale Lorenzo (2015), Hamiltonian truncation study of the $?^4$ theory in two dimensions, in JHEP, 0.
Large field excursions and approximate discrete symmetries from a clockwork axion
Kaplan David E., Rattazzi Riccardo (2015), Large field excursions and approximate discrete symmetries from a clockwork axion, in Phys. Rev., D93(8), 085007-085007.
Superspace formulation of the local RG equation
Auzzi Roberto, Keren-Zur Boaz (2015), Superspace formulation of the local RG equation, in JHEP, 0.
The Composite Twin Higgs scenario
Barbieri Riccardo, Greco Davide, Rattazzi Riccardo, Wulzer Andrea (2015), The Composite Twin Higgs scenario, in JHEP, 08, 161-161.
What is the $\gamma \gamma$ resonance at 750 GeV?
Franceschini Roberto, Giudice Gian F., Kamenik Jernej F., McCullough Matthew, Pomarol Alex, Rattazzi Riccardo, Redi Michele, Riva Francesco, Strumia Alessandro, Torre Riccardo (2015), What is the $\gamma \gamma$ resonance at 750 GeV?, in JHEP, 03, 144-144.
Zoology of condensed matter: Framids, ordinary stuff, extra-ordinary stuff
Nicolis Alberto, Penco Riccardo, Piazza Federico, Rattazzi Riccardo (2015), Zoology of condensed matter: Framids, ordinary stuff, extra-ordinary stuff, in JHEP, 06, 155-155.
Composite Charge 8/3 Resonances at the LHC
Matsedonskyi Oleksii, Riva Francesco, Vantalon Thibaud (2014), Composite Charge 8/3 Resonances at the LHC, in JHEP, 0.
Hunting composite vector resonances at the LHC: naturalness facing data
Greco Davide, Liu Da (2014), Hunting composite vector resonances at the LHC: naturalness facing data, in JHEP, 0.
The local RG equation and chiral anomalies
Keren-Zur Boaz (2014), The local RG equation and chiral anomalies, in JHEP, 0.
Weak Scale Baryogenesis in a Supersymmetric Scenario with R-parity violation
Rompineve Fabrizio (2014), Weak Scale Baryogenesis in a Supersymmetric Scenario with R-parity violation, in JHEP, 0.

Collaboration

Group / person Country
Types of collaboration
Université Paris 7, Paris France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dpt. of Physics, Columbia University, NY United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Johns Hopkins University United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
CERN Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Universitat Autonoma Barcelona Spain (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Institute of Theoretical Physics - Chinese Academy of Sciences China (Asia)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Yale University United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
Scuola Normale Superiore, Pisa Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Higgs Couplings 2016 Talk given at a conference Patterns of Strong Dynamics for LHC Searches 09.11.2016 SLAC - Stanford, United States of America Rattazzi Riccardo;
SEARCH 2016 Talk given at a conference Naturalness & Neutral Naturalness 31.08.2016 Oxford, Great Britain and Northern Ireland Rattazzi Riccardo;
Gearing up for LHC13 Talk given at a conference Concluding Talk 13.11.2015 Florence, Italy Rattazzi Riccardo;
39th Johns Hopkins Workshop Talk given at a conference Naturalness, the Twin Higgs and its Composite Incarnation 12.08.2015 Goteborg, Sweden Rattazzi Riccardo;
TASI 2015 Talk given at a conference Behind and Beyond the Standrd Model (Phenomenology for String Theorists) 22.06.2015 Boulder, United States of America Rattazzi Riccardo;
Bootstrap 2015 Talk given at a conference Quantum Perfect Fluids 18.05.2015 Weizmann Institute, Israel Rattazzi Riccardo;
GGI lectures on the theory of fundamental interactions 2015 Talk given at a conference Particle Physics and 4D RG flows 12.01.2015 Florence, Italy Rattazzi Riccardo;
Naturalness 2014 Talk given at a conference Naturalness & Compositeness 14.11.2014 Weizmann Institute, Israel Rattazzi Riccardo;
Quantum Fields beyond Perturbation Theory - KITP Talk given at a conference The Local RG & the Structure of 4D RG flows 27.01.2014 KITP, Santa Barbara, United States of America Rattazzi Riccardo;


Associated projects

Number Title Start Funding scheme
169696 Quantum Field Theory Across the Energy Frontier 01.12.2016 Project funding
138131 Quantum Field Theory Across the Energy Frontier 01.12.2011 Project funding
125237 Applications of Quantum Field Theory to the Micro and Macro Worlds 01.09.2009 Project funding
141847 Particle Physics with high-quality data from the CERN LHC 01.10.2012 Sinergia
160814 Particle Physics with high-quality data from the CERN LHC 01.10.2015 Sinergia

Abstract

Quantum Field Theory (QFT) is the indispensable conceptual framework to describe fundamental physics. Its success is exemplified by the Standard Model (SM), a specific quantum field theory that spectacularly accounts for all observations performed so far in particle physics experiments. It is however rather clear that the SM in spite of its success cannot be the ultimate description of nature.For one thing it does not account for the dark matter that mostly constitutes galaxy halos and does not explain the origin of baryons, that make up ordinary matter. Moreover there arevarious features about its structure that cry out loud for a deeper explanation. Among these, one can mention the structure of fermion masses and mixing angles, the smallness of the QCD vacuum angle, the structure of the gauge interactions and their possible unification also including gravity, the origin of electroweak symmetry breaking. For many of those issuesit is possible, and sometimes preferable, to find an explanation from new dynamics at very short distance. In that case the new dynamics cannot be directly tested by our present experimental technology. The mystery of electroweak symmetry breaking will instead likely be solved by the direct exploration of the weak scale at the Large Hadron Collider(LHC) and at future linear colliders.In the last few decades, the open problems in particle physics have forced us to explore new territories in QFT.The great development of supersymmetry, extra-dimensions or conformal field theory are largely a result of that effort. By these studies we think we have gained valuable information about which signals to search for and how. However, in many cases we have also gained quite interesting information about QFT per se. Exact non-perturbative results in supersymmetric field theory and AdS/CFT are outstanding examples of that.In a similar way, this research proposal has a multiple orientation, towards questions of direct potential relevance to particle physics but also towards field theoretic issues, that may be more broadly relevant, in principle even to the study of condensed matter systems. Among the former class of problems, I will continue the exploration of supersymmetry and of models with a composite Higgs sector. In particular I will developed new insights to test these ideas at the LHC. I will also correlate LHC signalswith the physics of the early universe, in particular in what concerns baryogenesis.On the formal side, I plan to improve our understanding of the structure of renormalization group flows in four dimensions. In particular I will study the connection between scale and conformal invariance at the non-perturbative level. I will also pursue the construction of explicit, if only approximate, conformal field theories in four dimensions. Finally I will follow a new line of research by developing effective field theory methods to systematically describe the dynamics of fluids and solids.
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