Présidents de session
Parallel I: Direct detection
- Doojin Kim
Parallel I: Direct detection
- Doojin Kim
Parallel I: Dark matter models at colliders
- Y. Mambrini
Parallel I: Cosmology
- Pasquale Dario Serpico (LAPTh, Annecy-le-vieux)
A variety of experiments have been developed over the past decades, aiming at the detection of Weakly Interactive Massive Particles (WIMPs) via their scattering in an instrumented medium. The sensitivity of these experiments has improved with a tremendous speed, thanks to a constant development of detectors and analysis methods. Detectors capable of reconstructing the direction of...
LUX (Large Underground Xenon) was a 250 kg dual-phase (liquid/gas) xenon TPC with an active mass of 250 kg that operated at the Sanford Underground Research Facility (SURF) in the US, from 2013 until 2016. Its main objective was to look for evidence of galactic dark matter in the form of Weakly Interacting Massive Particles (WIMPs). During the full 427 live-days run, it excluded WIMP-nucleon...
DEAP-3600 is a single-phase liquid-argon Dark Matter direct detection experiment located 2 km underground at SNOLAB, in Sudbury, Canada. With a 1 tonne fiducial mass, the target sensitivity to spin-independent scattering of 100 GeV weakly interacting massive particles (WIMPs) is 10^{-46} cm^2. The detector was designed and built to reach a background level of less than 0.6 events in 3...
The Sodium-iodide with Active Background REjection (SABRE) experiment is designed to search for the annual modulation of dark matter interaction rate with NaI(Tl) crystals. The experiment will also be able to perform a conclusive model-independent test of the notorious DAMA/LIBRA annual modulation signal. This signal is compatible with the WIMP-nucleon scattering hypothesis, but it is in...
Simplified models have become one of the standard methods to interpret searches for new physics at the LHC. They reduce full models with dozens of particles and a plethora of parameters to subsets with just a handful of new states. The virtue of simplified model spectra (SMS), namely that a full model decomposes into many different SMS, also defines their main challenge: depending on the...
We examine the collider signatures of a WIMP dark matter scenario comprising a singlet fermion and an SU(2) n-plet fermion, with a focus on n=3 and n=5. The singlet and n-plet masses are of the order of the electroweak scale. The n-plet contains new charged particles which will be copiously pair-produced at the LHC. Small mixing angles and near-degenerate masses, both of which feature...
We investigate and compare two simple models of dark matter (DM): a vector and a scalar DM. In the former case an extra gauged group factor $U(1)$ is introduced, and the DM is the corresponding massive gauge boson $A_X^\mu$. The $U(1)$ symmetry is spontaneously broken by a vacuum of an extra scalar complex field $S$. Dark charge conjugation $A_X^\mu\to -A_X^\mu$ with $S \to S^*$ is responsible...
We discuss a flavourful $Z'$ portal model with a coupling to fourth-family singlet Dirac neutrino dark matter. In the absence of mixing, the $Z′$ is fermiophobic, having no couplings to the three chiral families, but does couple to a fourth vector-like family. Due to mixing effects, the Z′ gets induced couplings to second family left-handed lepton doublets and third family left-handed quark...
We are in the midst of an exciting time for understanding the dark sector of the Universe. Current and upcoming projects, including DES, LSST, and Euclid are observing an unprecedented number of galaxies and other astrophysical objects. It is critical to develop robust strategies that fully utilize this statistical power to extract cosmological information. I will present recent work...
Massive spectroscopic surveys are a key-component of the cosmological experiments, constraining the dark energy with the measurement of the Baryon Acoustic Oscillation (BAO) scale, but also the General Relativity on cosmological scales through redshift-space distortion (RSD) measurements, or the summed mass of all neutrino species.
I will first present latest results from the SDSS/eBOSS survey...
In this talk I will present some recent results about the Birkhoff theorem in theories of gravity with non-vanishing torsion. Specifically, I will consider the most general quadratic Lagrangian, which depends on 9 parameters. Then, I will show that under some combination of the parameters, we can new theories in which the Birkhoff theorem holds. Moreover, other combinations allow us to find...
The determination of sigma_8 by both the CMB lensing and LSS galactic number counts assumes the LambdaCDM model for the growth function of structures.
We show that some models of dark energy like the Hu-Sawicky model make the sigma_8 tension worse while some models like the CPL phenomenological model ease the tension. Among dark matter models we find that assuming DM with shear and bulk...
