Luca MarchettiContact

Postdoctoral Fellow · OIST & Kavli IPMU

Luca
Marchetti

I am a theoretical physicist studying how our universe emerges from quantum gravity, what observable signatures its microscopic structure might leave, and how those signatures can be defined and detected.

Explore my research INSPIRE profile
Portrait of Luca Marchetti

01 / Research

From quantum geometry to the universe

01

Group field theory

I use group field theory as a many-body and field-theoretic language for quantum geometry and non-perturbative quantum gravity, connecting its spacetime atoms and collective phases to macroscopic gravitational physics and cosmology.

  • Quantum geometry
  • Spacetime atoms
  • Phase transitions
  • Renormalization
02

Quantum gravity & cosmology

I study how cosmological physics can emerge from non-perturbative quantum gravity, and how that microscopic origin could leave observable signatures in the early and late universe.

  • Emergent cosmology
  • Phenomenology
  • Dark energy
03

Relational physics

In gravity, observables encode only relations between dynamical systems. Reference frames are themselves dynamical—and, in quantum gravity, quantum. I study the consequences of this change of perspective from non-gravitational physics.

  • Quantum reference frames
  • Relational observables
  • Gauge invariance

02 / Publications

Recent & selected work

01
2026PreprintSelected

Relational path integral, effective actions and quantum frame covariance in gravity

S. E. Aguilar-Gutierrez, R. Ferrero, P. A. Höhn, L. Marchetti

arXiv
02
2025PreprintSelected

Cosmic Acceleration from Quantum Gravity: Emergent Inflation and Dynamical Dark Energy

L. Marchetti, T. R. Ladstätter, D. Oriti

arXiv
03
2025Preprint

Interacting Scalar Field Cosmology from Full Quantum Gravity

T. R. Ladstätter, L. Marchetti

arXiv
04
2024Classical and Quantum GravitySelected

Relational observables in group field theory

L. Marchetti, E. Wilson-Ewing

arXiv DOI
05
2024Physical Review D

Exactly soluble group field theory

L. Marchetti, H. Mehmood, V. Husain

arXiv DOI
06
2024General Relativity and Gravitation

Quantum gravity, hydrodynamics and emergent cosmology: a collection of perspectives

J. Ben Achour et al.

arXiv DOI
07
2023Classical and Quantum GravitySelected

Scalar cosmological perturbations from quantum gravitational entanglement

A. F. Jercher, L. Marchetti, A. G. A. Pithis

arXiv DOI
08
2023Physical Review D

Scalar cosmological perturbations from quantum entanglement within Lorentzian quantum gravity

A. F. Jercher, L. Marchetti, A. G. A. Pithis

arXiv DOI
Complete publication record on INSPIRE

03 / Talks

Talks & lectures

Highlighted talks

A selection of plenary lectures, invited seminars, and presentations

7 Aug 2026

Invited lecture

Quantum Reference Frames for Quantum Gravity: The Relational Gravitational Path Integral

Quantum Crossroads · Kavli IPMU · Kashiwa, Japan

Slides / PDF

29 May 2026

Plenary talk

Quantum Gravity and Emergent Cosmology: A Group Field Theory Perspective

Loops’26 International Conference on Quantum Gravity · Loops’26 · Hangzhou, China

Slides / PDF

12 Feb 2026

Invited talk

Emergent Acceleration from Quantum Gravity: Dynamical Dark Energy and Inflation

13th Tux Winter Workshop on Quantum Gravity · Tux Winter Workshop · Tux, Austria

Slides / PDF

30 Sept 2025

Invited talk

Emergent Cosmology from Quantum Gravity Hydrodynamics

The Universe in the Math, in the Sky and in the Lab · Universidad Complutense de Madrid · Madrid, Spain

Slides / PDF

Full archive

23 talks & seminars

04 / Selected CV

Experience

2024 — present

QISS Postdoctoral Fellow

Okinawa Institute of Science and Technology · Kavli IPMU

Position jointly supported by OIST, Kavli IPMU, QISS and WOST

2023 — 2024

Postdoctoral Fellow

University of New Brunswick

Position jointly supported by University of New Brunswick and AARMS

2018 — 2022

PhD in Physics

University of Pisa · LMU Munich

Download the complete CV for publications, presentations, academic roles, and further details.

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