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Quantum Field Theory Across the Energy Frontier

Applicant Rattazzi Riccardo
Number 169696
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 01.12.2016 - 30.11.2019
Approved amount 510'000.00
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All Disciplines (2)

Discipline
Theoretical Physics
Particle Physics

Keywords (9)

Cosmology; Effective Field Theory; Physics Beyond the Standard Model; Conformal Field Theory; Electroweak Symmetry Breaking; Standard Model ; LHC Phenomenology; Supersymmetry; Inflation

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

Questo progetto si  pone  tre obiettivi. Il primo, abbastanza tecnico, concerne le teorie di campo conformi, che descrivono il  comportamento di teorie di campo a piccolissime o grandissime distanze e sono ugualmente rilevanti nella fisica delle particelle e nella fisica della materia condensata. In questo progetto, da un lato si svilupperá una nuova interessante  tecnica per studiare queste teorie in un regime in cui gli effetti classici dominano gli effetti quantistici e in cui la descrizione diventa universale, cioé  indipendente dalla teoria in questione. Dall’altro proseguirá lo studio della struttura dello spazio delle teorie conformi col metodo del bootstrap, la cui efficacia é stata scoperta in un mio artiolo del 2008. Un secondo obiettivo é scoprire quale sia la dinamica che si cela dietro il bosone di Higgs. Accando ad idee piú sviluppate, quali la supersimmetria e la compositezza, si studierá il rilassione, che offre una spiegazione cosmologica per l’origine di aspetti salienti della dinamica del bosone di Higgs. Inoltre si studierá l’origine delle masse dei quark e dei leptoni in modelli composti, in particolare nel contesto di teorie conformi. Infine un terzo obiettivo concernerá l’universo primordiale. Si svilupperanno teorie alternative per spiegare l’inflazione e l’origine del Big Bang e se ne studieranno le conseguenze. In particolare si considereranno nuovi possibili stati  della materia e se ne studierá l'impatto sulla struttura delle fluttuazioni di densitá primordiali.

 

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

 

 

Direct link to Lay Summary Last update: 02.11.2016

Responsible applicant and co-applicants

Employees

Publications

Publication
Feynman diagrams and the large charge expansion in 3 − ε dimensions
Badel Gil, Cuomo Gabriel, Monin Alexander, Rattazzi Riccardo (2020), Feynman diagrams and the large charge expansion in 3 − ε dimensions, in Physics Letters B, 802, 135202-135202.
Sub-MeV dark matter and the Goldstone modes of superfluid helium
Caputo Andrea, Esposito Angelo, Polosa Antonio D. (2019), Sub-MeV dark matter and the Goldstone modes of superfluid helium, in Physical Review D, 100(11), 116007-116007.
The epsilon expansion meets semiclassics
Badel Gil, Cuomo Gabriel, Monin Alexander, Rattazzi Riccardo (2019), The epsilon expansion meets semiclassics, in Journal of High Energy Physics, 2019(11), 110-110.
Which EFT
Falkowski Adam, Rattazzi Riccardo (2019), Which EFT, in Journal of High Energy Physics, 2019(10), 255-255.
Boosting the dark matter signal with Coulomb resonances
Mahbubani Rakhi, Mimouni Kin (2019), Boosting the dark matter signal with Coulomb resonances, in Journal of Cosmology and Astroparticle Physics, 2019(09), 056-056.
Nonperturbative test of consistency relations and their violation
Esposito Angelo, Hui Lam, Scoccimarro Roman (2019), Nonperturbative test of consistency relations and their violation, in Physical Review D, 100(4), 043536-043536.
Sub-GeV dark matter in superfluid He-4: an effective theory approach
Acanfora Francesca, Esposito Angelo, Polosa Antonio D. (2019), Sub-GeV dark matter in superfluid He-4: an effective theory approach, in The European Physical Journal C, 79(7), 549-549.
Electroweak baryogenesis above the electroweak scale
Glioti Alfredo, Rattazzi Riccardo, Vecchi Luca (2019), Electroweak baryogenesis above the electroweak scale, in Journal of High Energy Physics, 2019(4), 27-27.
The large charge expansion at large N
de la Fuente Anton (2018), The large charge expansion at large N, in Journal of High Energy Physics, 2018(8), 41-41.
Rotating superfluids and spinning charged operators in conformal field theory
Cuomo Gabriel, de la Fuente Anton, Monin Alexander, Pirtskhalava David, Rattazzi Riccardo (2018), Rotating superfluids and spinning charged operators in conformal field theory, in Physical Review D, 97(4), 045012-045012.
General bootstrap equations in 4D CFTs
Cuomo Gabriel Francisco, Karateev Denis, Kravchuk Petr (2018), General bootstrap equations in 4D CFTs, in Journal of High Energy Physics, 2018(1), 130-130.
Precision tests and fine tuning in twin Higgs models
Contino Roberto, Greco Davide, Mahbubani Rakhi, Rattazzi Riccardo, Torre Riccardo (2017), Precision tests and fine tuning in twin Higgs models, in Physical Review D, 96(9), 095036-095036.
Gaugid inflation
Piazza Federico, Pirtskhalava David, Rattazzi Riccardo, Simon Olivier (2017), Gaugid inflation, in Journal of Cosmology and Astroparticle Physics, 2017(11), 041-041.
Semiclassics, Goldstone bosons and CFT data
Monin A., Pirtskhalava D., Rattazzi R., Seibold F. K. (2017), Semiclassics, Goldstone bosons and CFT data, in Journal of High Energy Physics, 2017(6), 11-11.
Higgs Boson Studies at Future Particle Colliders
RattazziRiccardo, Higgs Boson Studies at Future Particle Colliders, in JHEP.

Collaboration

Group / person Country
Types of collaboration
Department of Physics, UC Davis United States of America (North America)
- Publication
Universitá di Padova Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Department of Physics, University of Maryland United States of America (North America)
- Publication
Marseille, CPT France (Europe)
- Publication
S.I.S.S.A. Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
C.E.R.N. Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Scuola Normale Superiore, Pisa Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Laboratoire de Physique Théorique d’Orsay (LPT) France (Europe)
- Publication

Associated projects

Number Title Start Funding scheme
150060 Quantum Field Theory Across the Energy Frontier 01.12.2013 Project funding
160814 Particle Physics with high-quality data from the CERN LHC 01.10.2015 Sinergia
188671 Visiting Realms in Quantum Field Theory 01.12.2019 Project funding

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 are various 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 and cosmology but also towards field theoretic issues, that may be more broadly relevant. Among the former class of problems, I will pursue an open minded exploration of scenarios that offer an explanation for the origin of the weak scale and of electroweak symmetry breaking. In particular I will closely follow the evolution of LHC run 2. I will also correlate LHC signals with the physics of the early universe. On the formal side, I plan to improve our understanding of conformal field theory (CFT) in any dimension, four in particular. I will develop analytical tools to constrain the structure of CFTs and also pursue the construction of explicit, if only approximate, novel CFTs.
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