Chatelain, Amélie Volpe, Maria Cristina

We explore the impact of strong gravitational fields on neutrino decoherence. To this aim, we employ the density matrix formalism to describe the propagation of neutrino wave packets in curved spacetime. By considering Gaussian wave packets, we determine the coherence proper time, neglecting the effect of matter outside the compact object. We show ...

plastino, angelo rocca, m. c.

behavior (specifically, baryons).

Creminelli, Paolo Tambalo, Giovanni Vernizzi, Filippo Yingcharoenrat, Vicharit

We study the decay of gravitational waves into dark energy fluctuations $\pi$, taking into account the large occupation numbers. We describe dark energy using the effective field theory approach, in the context of generalized scalar-tensor theories. When the $ m_3^3 \delta K\delta g^{00}$ (cubic Horndeski) and $\tilde m_4^2$ (beyond Horndeski) oper...

Aad, Georges Abbott, Brad Abbott, Dale Charles Abed Abud, Adam Abeling, Kira Abhayasinghe, Deshan Kavishka Abidi, Syed Haider AbouZeid, Ossama Abraham, Nicola Abramowicz, Halina
...

This letter presents a combination of searches for Higgs boson pair production using up to 36.1 fb$^{-1}$ of proton-proton collision data at a centre-of-mass energy $\sqrt{s} = 13$ TeV recorded with the ATLAS detector at the LHC. The combination is performed using six analyses searching for Higgs boson pairs decaying into the bbbb, bbWW, bb$\tau\ta...

Brax, Philippe Cembranos, Jose A.R. Valageas, Patrick

We consider models of scalar dark matter with a generic interaction potential and non-canonical kinetic terms of the K-essence type that are subleading with respect to the canonical term. We analyse the low-energy regime and derive, in the nonrelativistic limit, the effective equations of motions. In the fluid approximation they reduce to the conse...

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 statistical combination of searches for heavy resonances decaying to pairs of bosons or leptons is presented. The data correspond to an integrated luminosity of 35.9 fb$^{-1}$ collected during 2016 by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV. The data are found to be consistent with expectatio...

Puhm, Andrea

A central feature of scattering amplitudes in gravity or gauge theory is the existence of a variety of energetically soft theorems which put constraints on the amplitudes. Celestial amplitudes which are obtained from momentum-space amplitudes by a Mellin transform over the external particle energies cannot obey the usual energetically soft theorems...

Bern, Zvi Kosower, David Parra-Martinez, Julio

We compute the anomalous two-loop four-point amplitudes in N=4 pure supergravity, using unitarity and the double-copy construction. We also present all terms determined by four-dimensional cuts in two all-multiplicity two-loop anomalous superamplitudes. This result provides the first two-loop n-point gravity amplitude, up to a class of undetermined...

Bachas, Constantin

I compare two holographic mechanisms giving to the graviton a parametrically-small supersymmetric mass $m_g$ in Anti-de Sitter spacetime. In the context of bi-metric gravity these mechanisms couple `weakly' two initially decoupled superconformal theories by: (i) turning on a double-trace deformation, or (ii) gauging a common global symmetry. Superc...

Guimarey, Danilo Artigas Mielczarek, Jakub Rovelli, Carlo

The kinematical phase space of classical gravitational field is flat (affine) and unbounded. Because of this, field variables may tend to infinity leading to appearance of singularities, which plague Einstein's theory of gravity. The purpose of this article is to study the idea of generalizing the theory of gravity by compactification of the phase ...