The 24th International Symposium on Particle, Strings, and Cosmology will take place in the physics department at Case Western Reserve University, Cleveland, Ohio, June 4-8, 2018.
The conference website is: http://artsci.case.edu/pascos2018/
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Registration and welcoming
Chairman: P. Fileviez Perez
Chairman: G. Starkman
Chairman: K. Hinterbichler
Chairman: M. Carena
We perform a Bayesian statistical analysis of the constraints on the Higgs couplings given by the Higgs electroweak chiral Lagrangian. We obtain bounds on the effective coefficients entering in Higgs observables at the leading order, using all available Higgs-boson signal strengths from the LHC runs 1 and 2 including data reported at Moriond 2018. Using a prior dependence study of the solutions, we discuss the results within the context of natural-sized Wilson coefficients. The effective theory we study is closely related to the expeimental kappa-framework, which we also discuss. We further study the expected sensitivities to the different Wilson coefficients at various possible future colliders.
I will discuss a mechanism that describes the spontaneous breaking of the gauge (color) group in strongly coupled N=4SYM coupled to charged fundamental matter. The system is holographically described by an intersection of D3 and D7 branes, with a global (baryonic) U(1) charge on the worldvolume of the latter. Backreaction of the D7 branes and the baryonic charge on the geometry is crucial in this mechanism, since the IR geometry is responsible for the instability towards the breaking of the color group.
A light bosonic field mediates a long-range "fifth" force between objects. If the field has self-interactions, experimental constraints on such forces are weakened due to a screening effect. We study how technically natural values for self-interaction terms in the field's potential lead to modification of existing constraints. We show that under this assumption of natural self-interactions, existing experimental coverage has important gaps, particularly for forces stronger than gravity.
Chairman: G. Gabadadze
Chairman: B. Monreal
The experiments at the LHC have been improving the measurements of the Higgs boson properties, and searches for new physics are being actively conducted. In the absence of deviations from the Standard Model thus far, it would be prudent to seek for other complementary strategies in the experiments at the energy frontier. For this purpose, we propose to study the Higgs couplings at high energy scales. We focus on the energy scale-dependence of the off-shell Higgs propagation, and of the top quark Yukawa coupling, exploiting the signal process gg —> h —> ZZ. We present several representative scenarios relevant to addressing the naturalness problem. We find that certain scenarios are potentially observable at the LHC upgrade for high luminosity or a higher energy.
Chairman: R. Brown
The MicroBooNE detector is a 170 ton liquid argon time projection chamber (LArTPC) operating in the Booster and NuMI neutrino beams at Fermilab since October 2015. The MicroBooNE physics program includes neutrino oscillation searches that aim to resolve the anomalous excess of low-energy electromagnetic shower events observed by MiniBooNE, as well as neutrino cross-section measurements on liquid argon and R&D to inform future LArTPC design. This talk will describe the MicroBooNE detector and present a number of recent results from across its physics program.
Chairman: H. Mathur
Chairman: A. Tolley
The 21cm radiation from cosmic neutral hydrogen can be used to survey large cosmological volumes of the Universe through intensity mapping. I will discuss the impact of neutrino masses on the abundance and clustering of neutral hydrogen, that we have investigated through hydrodynamic simulations with massive neutrinos. I will show that it can be understood by accounting for the effects neutrinos induce on the properties of matter and halos. I will show forecasts on how well upcoming instruments, like the Square Kilometer Array, can detect the minimum mass of the neutrino masses.
We discuss a cosmological phase transition within the Standard Model which incorporates spontaneously broken scale invariance as a low-energy theory. In addition to the Standard Model fields, the minimal model involves a light dilaton, which acquires a large vacuum expectation value (VEV) through the mechanism of dimensional transmutation. Under the assumption of the cancellation of the vacuum energy, the dilaton develops a very small mass at 2-loop order. As a result, a flat direction is present in the classical dilaton-Higgs potential at zero temperature while the quantum potential admits two (almost) degenerate local minima with unbroken and broken eletroweak symmetry. We found that the cosmological electroweak phase transition in this model can only be triggered by a QCD chiral symmetry breaking phase transition at low temperatures, T ≈ 132 MeV. Furthermore, unlike the standard case, the universe settles into the chiral symmetry breaking vacuum via a first-order phase transition which gives rise to a stochastic gravitational background with a peak frequency ~ 10-8 Hz as well as triggers the production of approximately solar mass primordial black holes. The observation of these signatures of cosmological phase transitions together with the detection of a light dilaton would provide a strong hint of the fundamental role of scale invariance in particle physics.
Large scale structure simulations are a fundamental tool to interpret data from large volume galaxy surveys. In fact, modelling the observables and their covariance is affected by the non-linear regime of gravitational collapse, a phenomenon that is best captured through simulations. In this talk I will present some applications of simulations that are relevant to present and upcoming galaxy surveys, such as predicting the cosmological signal and the production of mock gala
I will describe how the baryon acoustic oscillation (BAO) scale observed in the distribution of galaxies can be treated as a standard ruler that enables distance measurements as a function of redshift. These measurement allow precise tests on the nature of Dark Energy. I will describe the current status of BAO measurements and the constraints they afford, focusing on recent measurements from the completed Baryon Oscillation Spectroscopic Survey (BOSS) and two ongoing experiments: the Dark Energy Survey (DES) and extended-BOSS (eBOSS). I will finish with a description of what to anticipate from the final DES and eBOSS data and then the data obtained from Dark Energy Spectroscopic Instrument further in the future.
Chairman: C. Covault
Chairman: C. de Rham
Chairman: P. Nath