Nortier, Florian

Scenarii with Large Extra Dimensions (LEDs) compactified on a ($q \leq 7$)D torus and with the Standard Model (SM) fields localized on a 3-brane reformulate the gauge hierarchy problem between the 4D Planck scale $\Lambda_P^{(4)} \sim 10^{18}$ GeV and the electroweak scale $\Lambda_{EW} \sim 100$ GeV as a geometrical hierarchy problem: gravity is s...

Kehagias, Alex Partouche, Hervé de Vaulchier, Balthazar

We consider four-dimensional quadratic gravity coupled to infinite towers of free massive scalar fields, Weyl fermions and vector bosons. We find that for specific numbers of towers, finite cosmological and Newton constants are induced in the 1-loop effective action. This is derived both in Adler's approach and by using the heat kernel method, whic...

Abbar, Sajad Duan, Huaiyu Sumiyoshi, Kohsuke Takiwaki, Tomoya Volpe, Maria Cristina

The dense neutrino medium in a core-collapse supernova or a neutron-star merger event can experience fast flavor conversions on time/distance scales that are much smaller than those of vacuum oscillations. It is believed that fast neutrino flavor transformation occurs in the region where the angular distributions of $\nu_e$ and $\bar\nu_e$ cross ea...

Abbar, Sajad Duan, Huaiyu Sumiyoshi, Kohsuke Takiwaki, Tomoya Volpe, Maria Cristina

A dense neutrino gas, such as the one anticipated in the supernova environment, can experience fast neutrino flavor conversions on scales much shorter than those expected in vacuum probably provided that the angular distributions of νe and ν¯e cross each other. We perform a detailed investigation of the neutrino angular distributions obtained by so...

Sarrazin, Michaël Stasser, Coraline

While our visible Universe could be a 3-brane, some cosmological scenarios consider that other 3-branes could be hidden in the extra-dimensional bulk. Matter disappearance toward a hidden brane is mainly discussed for neutron - both theoretically and experimentally - but other particles are poorly studied. Recent experimental results offer new cons...

Cassé, Michel Mansoulié, Bruno Silk, Joseph

We derive the maximum fraction of energy emitted in the form of massive (Kaluza–Klein) gravitons by core collapse supernovae, and the corresponding minimal extra-dimensional Planck mass M* in the ADD gravity framework at TeV scales. Our constraints arise (a) from the extragalactic gamma-ray background observed by Fermi-LAT after astrophysical sourc...

Sirunyan, Albert M Tumasyan, Armen Adam, Wolfgang Ambrogi, Federico Bergauer, Thomas Brandstetter, Johannes Dragicevic, Marko Erö, Janos Escalante Del Valle, Alberto Flechl, Martin
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A search in an all-jet final state for new massive resonances decaying to $\text{ W }{}{}\text{ W }{}{}$, $\text{ W }{}{}\text{ Z }{}{}$, or $\text{ Z }{}{}\text{ Z }{}{}$ boson pairs using a novel analysis method is presented. The analysis is performed on data corresponding to an integrated luminosity of 77.3 $\,\text {fb}^{-1}$ recorded with the ...

Alkalaev, Konstantin Bekaert, Xavier

We aim at formulating a higher-spin gravity theory around AdS$_2$ relevant for holography. As a first step, we investigate its kinematics by identifying the low-dimensional cousins of the standard higher-dimensional structures in higher-spin gravity such as the singleton, the higher-spin symmetry algebra, the higher-rank gauge and matter fields, et...

Andriot, David Tsimpis, Dimitrios

We study gravitational waves propagating on a warped Minkowski space-time with D-4 compact extra dimensions. While Kaluza-Klein scales are typically too high for any current detection, we analyse how the warp factor changes the Kaluza-Klein spectrum of gravitational waves. To that end we provide a complete and explicit expression for the warp facto...

Petac, Mihael

The nature of dark matter remains uncertain despite several decades of dedicated experimental searches. The lack of tangible evidence for its non-gravitational interactions with ordinary matter gives good motivation for exploring new avenues of inferring its properties through purely gravitational probes. In particular, addressing its small-scale d...