QUANTUM GRAVITY, HIGHER DERIVATIVES & NONLOCALITY
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Program


The time of the talks have been carefully chosen in order to be as suitable as possible for all the Invited Speakers, taking into account the fact that scientists from at least three different continents will participate in the Workshop. 

​​Most of the talks will last 30’+5’, and few of them 25’+5’. Discussion sessions will last (at least, but most likely more than) 30’. Especially after the 2nd session of each day, discussion sessions can go on for hours without problem.

You can find below the program with all the scheduled talks.

You can now download the ​
abstracts.

Video recordings of the talks and discussion sessions can be found at this YouTube Channel.

​*Central European Time (CET) 

Monday 8th
​

Session 1: Towards a (local) theory of quantum gravity

Chair: Luca Buoninfante
  • 12.30-12.50 (20’): Opening remarks
  • 12:50-13:40 (40’+10’): Gerard ‘t Hooft [Negative energies in quantum gravity] <KEYNOTE> slides
  • 13:40-14:15 (30’+5’): John Donoghue [The quantum field theory of quadratic gravity] slides
  • 14:15-14:50 (30’+5’): Roberto Percacci [Recent progress in Metric-Affine and Higher Derivative Gravity]
Chair: Luca Buoninfante & Richard Woodard
  • 15:00-15:30 (30’+): Discussion session 

Session 2: EFT of gravity, unitarity problem, Wilsonian vs non-Wilsonian UV completion

Chair: Alessia Platania
  • 16:30-17:05 (30’+5’): Claudia de Rham [Positivity in gravitational theories] 
  • 17:05-17:40 (30’+5’): Alberto Salvio [Quadratic gravity] 
  • 17:40-18:15 (30’+5’): Gia Dvali [Saturons and QFT meaning of self-UV-completion via classicalization] 
  • 18:15-18:50 (30’+5’): Philip Mannheim [Solution to the ghost problem in higher derivative gravity] slides
  • 19:00-19:30 (30’+): Discussion session  

​
Tuesday 9th

Session 1: Asymptotic safety approach to gravity 

Chair: Roberto Percacci
  • 13:00-13:35 (30’+5’): Frank Saueressig [Introducing form factors in asymptotically safe gravity] 
  • 13:35-14:10 (30’+5’): Alessia Platania [Non-perturbative unitarity and fictitious ghosts in quantum gravity] 
  • 14:10-14:45 (30’+5’): Astrid Eichhorn [Interplay of matter and quantum gravity] 
  • 14:55-15:25 (30’+):  Discussion session

Session 2: String (field) theory, higher derivatives & nonlocality

Chair: Alexey Koshelev
  • 16:30-17:05 (30’+5’): Ashoke Sen [String field theory] 
  • 17:05-17:40 (30’+5’): Irina Aref’eva [Notes on Cauchy problem for nonlocal equations] 
  • 17:40-18:15 (30’+5’): Branko Dragovich [On nonlocality of p-adic and zeta strings] slides
  • 18:15-18:50 (30’+5’): Olaf Hohm [Duality and higher derivatives] 
  • 19:00-19:30 (30’+):  Discussion session  


Wednesday 10th

Session 1: Higher derivatives, Lorentz (non)-invariance & (non)locality 

Chair: Masahide Yamaguchi
  • 12:30-13:05 (30’+5’): Andrei Barvinsky [Lorentz non-invariance as the palladium of locality, unitarity and renormalizability in quantum gravity] slides
  • 13:05-13:40 (30’+5’): Richard Woodard [The case for nonlocal modifications of gravity]
  • 13:40-14:15 (30’+5’): Ilya Shapiro [Exact renormalization group equations from the perturbative quantum gravity] slides 
  • 14:15-14:50 (30’+5’): Leslaw Rachwal [Higher derivative gauge theory as a toy-model for quantum gravity] slides​
  • 15:00-15:30 (30’+):  Discussion session 

Session 2: Nonlocal theories of gravity

Chair: Luca Buoninfante & Sravan Kumar
  • 16:30-17:05 (30’+5’): Nikolai Krasnikov [Aspects of nonlocal field theories and gravity] 
  • 17:05-17:40 (30’+5’): Alexey Koshelev [Ghosts in ghost-free analytic infinite derivative gravity theories] 
  • 17:40-18:15 (30’+5’): Terry Tomboulis [Nonlocal vertices, UV “opaqueness” and causality] 
  • 18:15-18:50 (30’+5’): Leonardo Modesto [Nonlocal quantum gravity] 
Chair: Tirthabir Biswas, Luca Buoninfante & Sravan Kumar
  • 19:00-19:30 (30’+):  Discussion session  


Thursday 11th

Session 1: Black holes, spacetime singularities & higher derivatives

Chair: Francesco Di Filippo
  • 12:30-13:00 (25’+5’): Jens Boos [Regular solutions in weak-field infinite-derivative theories: Green function approach] slides
  • 13:00-13:30 (25’+5’): Breno Giacchini [Regularization of Newtonian-limit singularities in higher-derivative gravity models] 
  • 13:30-14:05 (30’+5’): Anupam Mazumdar [Nonlocality in quantum gravity] 
  • 14:10-14:45 (30’+5’): Xavier Calmet [Quantum gravitational corrections to the entropy of a Schwarzschild black hole] 
  • 14:50-15:20 (30’+): Discussion session 

Session 2: Black holes, spacetime singularities & higher derivatives

Chair: Fabio Scardigli
  • 15:45-16:35 (40’+10’): Roger Penrose [Why quantizing gravity cannot, on its own, solve the gravitational singularity problem] <KEYNOTE>
  • 16:35-17:10 (30’+5’): Kellogg Stelle [Black holes in higher derivative gravity] slides
  • 17:10-17:45 (30’+5’): Valeri Frolov [Remarks on nonsingular black holes] slides
  • 17:45-18:05 (20’): Short break [discussions are welcome]
  • 18:05-18:40 (30’+5’): ​Bob Holdom [Ultraviolet completion and not quite black holes] ​
  • 18:40-19:15 (30’+5’): Andrei Zelnikov [Ghost free modification of the Polyakov action and 2D black holes] 
Chair: Francesco Di Filippo & Fabio Scardigli
  • 19:20-19:50 (30’+): Discussion session  


Friday 12th

Session 1:  Cosmology, higher derivatives & nonlocality

Chair: Sravan Kumar
  • 13:00-13:35 (30’+5’): Alexei Starobinsky [Geometric inflationary models based on higher-derivative gravity] slides
  • 13:35-14:10 (30’+5’): Masahide Yamaguchi [Cosmological perturbations in Palatini formalism] slides
  • 14:10-14:45 (30’+5’): Robert Brandenberger [String cosmology and the breakdown of local effective field theory] 
Chair: Sravan Kumar and João Marto
  • 14:55-15:25 (30’+):  Discussion session 

Session 2: Cosmology, higher derivatives & nonlocality

Chair: Robert Brandenberger
  • 16:30-17:05 (30’+5’): Thomas Hertog [Observational signatures of novel variations on Starobinsky inflation] 
  • 17:05-17:40 (30’+5’): Gianluca Calcagni [Stochastic gravitational-wave background in quantum gravity] 
  • 17:40-18:10 (25’+5’): Anna Tokareva [UV properties of nonlocal scalar theories] 
  • 18:10-18:40 (25’+5’): Anish Ghoshal [UV-completion in particle theory with infinite derivatives: conformal Invariance, laboratory, and cosmological implications] 
​
Chair: Robert Brandenberger, Luca Buoninfante & Sravan Kumar
  • ​18:50-19:40 (50’+): Final discussion session with all the speakers of the Workshop
​
Chair: Luca Buoninfante & Sravan Kumar
  • ​19:40-19:50 (10’): Concluding remarks & outlook​​






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