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09/02/2026, 08:30
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09/02/2026, 09:25
We consider four-dimensional quantum field theories (QFTs) coupled to the background dilaton and graviton fields. The IR effective action of these background fields is fixed by trace anomalies. Using this effective action we compute the dilaton-graviton scattering amplitude. We show that it receives a universal helicity-flipping contribution proportional to (∆c − ∆a) along any RG flow, where...
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09/02/2026, 10:15
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09/02/2026, 11:35
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09/02/2026, 12:25
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09/02/2026, 14:20
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09/02/2026, 15:10
The spectra of general non-minimal second-order operators are analyzed using the heat kernel method. In particular, we derive the local part of the trace of the second Seeley-DeWitt heat kernel coefficient for such operators in a completely model-independent way. We provide three examples to show how our result can be applied in practical scenarios, emphasizing on the phenomenological...
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09/02/2026, 16:05
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09/02/2026, 16:55
Recent works have argued that improved one-loop beta functions, which incorporate the physical momentum dependence of one-loop–corrected higher-derivative gravity theories, provide the most suitable description of their high-energy behaviour. We critically examined the validity of this claim. We have computed the explicit gauge dependence of the one-loop momentum running of curvature-squared...
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10/02/2026, 09:25
I will introduce several recent developments in analytical studies of cosmological correlators with massive exchanges, with an emphasis on the canonical objects called family trees. These family trees are well-defined hypergeometric functions to which an arbitrary massive tree graph can be reduced. I will discuss their analytical structures, differential equations, as well as generalizations...
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10/02/2026, 10:15
Cosmological phase transitions, especially first order phase transitions, have attracted renewed interest as potential sources of gravitational waves. Accurately predicting the resulting gravitational wave signal requires a reliable estimate of the transition rate, which is governed by a saddle-point configuration known as the bounce solution. The seminal work of Coleman, Glaser, and Martin...
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10/02/2026, 11:35
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10/02/2026, 12:25
I will present a model in which both gravity and quantum mechanics emerge as macroscopic statistical effects reflecting the free energy minimization of fundamental binary degrees of freedom. The model is defined by an ultraviolet continuous fixed point of a statistical model on random networks, governed by the combinatorial Ollivier-Ricci curvature, which acts as a network analogue of the...
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10/02/2026, 14:20
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10/02/2026, 15:10
In flat space the S-matrix is a gauge-independent observable in perturbative quantum gravity. The gauge-independence owes to the source and observer corrections that need to be included. I will discuss the generalization of this procedure to de Sitter space, without taking the asymptotic limits of the S-matrix, and recent work demonstrating gauge-independence of the construction. This is a...
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10/02/2026, 16:05
In this talk, two gravitationally induced decoherence models are analysed that compare different formulations of quantum gravity. The first model discusses decoherence induced by horizons with classical and quantum geometries. In a recent series of papers following arXiv:2205.06279, it was shown that classical horizons constantly induce decoherence on spatial quantum superpositions, which...
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10/02/2026, 16:30
Astatic geometry with applications ni microphysics is studied in this paper. The source of curvature is given by an anisotropic stress tensor. The null and timelike
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radial geodesics are investigated and found to represent hyperbolae, but with different accelerations. Due to the very high acceleration, close to the maximum one ($a \approx 10^{34}cm/s^{2}$) [1], a massless particle reach very... -
10/02/2026, 16:55
D’Adda has shown that by assigning a length to each link and coordinates to each labelled vertex, one can define a non-Euclidean flat metric and a reference frame within each simplex that is invariant under GL(n,R). In this formulation, the metric tensor is a function of both the link lengths and the vertex coordinates. In this talk, we show that by performing an appropriate gauge fixing of...
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11/02/2026, 09:25
This talk is based on arXiv:2512.10513 with Cedric Deffayet.
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Nonlocal modifications of gravity derive from corrections to the quantum
gravitational stress tensor which grow nonperturbatively strong during
primordial inflation and may persist to the current epoch. Phenomenological
constructions have been given that realize MOND in gravitationally bound
systems and, separately, reproduce... -
11/02/2026, 10:15
We simplify the gravitational equations that apply in accelerating spacetimes and are consistent with the cosmological principle. Solutions to these equations should be tantamount to all order resummations of the perturbative leading logarithms. We discuss the “null hypothesis” and study the observable local expansion rate.
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11/02/2026, 11:35
I will discuss a proposal to obtain an emergent spacetime
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and early universe cosmology starting from a thermal state of the
BFSS matrix model. The emergent space has three infinite classical
dimensions. Like in String Gas Cosmology, thermal fluctuations in
the initial state lead to a spectrum of density fluctuations which
is consistent with observations, and predicts a roughly... -
11/02/2026, 12:25
Non-local field theoretic frameworks can provide ghost free renormalizable description of gravity. Recently it is shown that a non-local extension of Starobinsky gravity can consistently realize inflation and have interesting observational features in the three point functions of scalar perturbations. In this talk we will describe inflation with a scalar field having non-local kinetic term and...
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11/02/2026, 14:20
The inclusion of higher derivatives is a necessary condition for a renormalizableor superrenormalizable local theory of quantum gravity. On the other hand, higher derivatives lead to classical instabilities and a loss of unitarity at the quantum level. A standard way to detect such issues is by examining the reflection positivity condition and the existence of a Kallen--Lehmann spectral...
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11/02/2026, 15:10
I present some recent developments in AdS QFT:
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two new formulae for two-point functions and their application
to compute Feynman diagrams in the real AdS manifold -
11/02/2026, 16:05
I will discuss infrared enhancements that are present in four-derivative theories in four dimensions (and presumably also in two-derivative theories in two dimensions). I will illustrate these effects using the example of quadratic gravity. Both the tree-level and one-loop approximations will be discussed. I will point out that these enhancements cannot be captured by running couplings. I will...
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11/02/2026, 16:55
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12/02/2026, 09:25
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12/02/2026, 10:15
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12/02/2026, 11:35
The quantum Seiberg–Witten (SW) curve approach to the black hole (BH) perturbation theory problem provides a solid framework for obtaining analytical results. The Coulomb branch moduli space of the SW theory is topologically a torus and is therefore characterized by two cycles. In the quantum theory, these cycles enter the exact Born–Sommerfeld like quantization condition for quasi-normal...
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12/02/2026, 12:00
The memory burden effect describes how an object's stored information resists its own decay. This mechanism is especially pronounced in saturons—systems that saturate unitarity bounds on entropy—with black holes providing the prime example. I will show how memory burden can halt Hawking evaporation and dynamically stabilize black holes against complete decay. Crucially, this phenomenon is not...
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12/02/2026, 12:25
We shown that an exactly static and spherically symmetric black hole event horizon cannot be embedded in a time-dependent geometry. Forcing it to do so results in a naked null singularity arising at the would-be horizon location. Therefore, black holes are expected to couple to the cosmological expansion and show a growth of their mass, which is unrelated to usual accretion mechanisms. We...
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12/02/2026, 14:20
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12/02/2026, 15:10
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12/02/2026, 16:00
We review the Bekenstein bound for thermodynamic entropy, and its dervation from arguments of black hole physics. Then we consider different generalized entropies as Tsallis-Cirto, Barrow, Tsallis-Jensen, and Renyi entropies. Thus, we establish new quantitative bounds on such entropies, arriving in this way to new formulations of the Bekenstein bound itself. We also briefly comment on the...
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12/02/2026, 16:50
I will present a result about the classification of singularities in static and spherically symmetric spacetimes. The theorem will allow us to conclude from fairly simple mathematical conditions the presence or absence of singular behaviour in some popular black hole solutions. These results are very general and stem from considerations of differential geometry, without resorting to any...
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13/02/2026, 09:25
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13/02/2026, 10:15
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13/02/2026, 11:35
A central lesson of the swampland program in quantum gravity is that ultraviolet and infrared regimes may be intertwined in subtle and nontrivial ways. This UV/IR mixing can have significant implications for low-energy gravitational effective field theories. Building on recent bounds that explicitly realize such mixing, I will derive new constraints on inflationary models, and also establish a...
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