Conveners
Plenary
- Costas Fountas (University of Ioannina (GR))
Plenary
- George Leontaris (University of Ioannina (GR))
Plenary
- Kyriakos Tamvakis (University of Ioannina (GR))
Plenary
- Apostolos Pilaftsis (University of Manchester (GB))
Plenary
- Tiziano Camporesi (CERN)
Plenary
- Vassilis Spanos (Department of Physics National and Kapodistrian University of Athens)
Plenary
- Nikos Mavromatos (University of London (GB))
Plenary
- Theodoros Alexopoulos (National Technical Univ. of Athens (GR))
Plenary
- Ilias Kyritsis (University of Crete (GR) and APC (FR))
Effective Field theory opens up a new programme of searching for New Physics in the absence of evidence for any new light particles. I will discuss recent progress in theoretical computations for Effective Field Theory and present results of global effective theory interpretations of LHC measurements.
Latest advances on the formulation of a grand covariant quantum field theory that includes fermions will be presented.
The LHC experiments are designed to discover hypothetical particles with prompt decays. In parallel, meta-stable particles are constrained by cosmological observations. Between these two extremes, there is a gap with particles with moderate lifetimes, connecting hidden sectors and the Standard Model through feeble interactions in "portal" models of dark matter, neutrino masses and other...
I will review briefly how inflation is expected to generate a stochastic background of primordial gravitational waves (GWs). Then, I will discuss how such GWs can be enhanced by a stiff period following inflation, enough to be observable. I will present examples of this in the contact of hybrid inflation with alpha-attractors, or a period of hyper-kination in Palatini gravity.
Axions can be considered as good dark matter candidates. The detection of such light particles an be achieved by observing axion induced atomic excitations. The target is in a magnetic field so that the m-degeneracy is removed the energy levels can be suitably adjusted. Since the axion is absorbed by the atom the cross section exhibits resonance behavior. Using an axion-electron coupling...
In the general framework of Metric-Affine theories of gravity, where the metric and the connection are independent variables, we consider actions quadratic in the Ricci scalar curvature and the Holst invariant (the contraction of the Riemann curvature with the Levi-Civita antisymmetric tensor) coupled non-minimally to a scalar field. We study the profile of the equivalent effective metric...
I discuss the possibility that torsion in the early Universe, which is a feature of several cosmological models, also in the realm of string theory, can provide dark energy which is sufficient to lead to inflation, but also to matter-antimatter asymmetry in the post inflationary Universe, through the axion-like degrees of freedom associated with the torsion. Specifically, I discuss how such...
Application Specific Integrated Circuits are vital for the LHC experiments and have involved some of the biggest technology innovations applied in the LHC detectors. Using the history of some of the principal ASICs used by the CMS experiment at the LHC as a reference point, ASIC developments for the first LHC generation will be discussed, commenting on the challenges and risks and how they...
The ATLAS collaboration at LHC has endorsed the resistive Micromegas technology, along with the small-strip Thin Gap Chambers (sTGC), for the high luminosity upgrade of the first muon station in the high-rapidity region, the so called New Small Wheel (NSW) project. After the R&D, the prototyping phase, the first series production Micromegas quadruplets have been constructed and the...
From the perspective of Particle Physics and Field Theory, Dark Energy is a low energy phenomenon. Thus, we expect that field theory in curved space time should be sufficient to understand the physics of Dark Energy and its observational consequences. However, in the context of the Standard Model of Particle Physics obtaining fields with sufficiently low masses that can both be protected...
The classical and quantum properties of systems maybe drastically affected by imposing constraints in their phase space. Desirable properties such as unitarity and renormalizability may not be retained. In this general context we consider a specific model which by construction is also classically integrable. After imposing a constraint we show that at tree level integrability is preserved ...
We derive the quantum energy-momentum tensor and the corresponding quantum equation of state for gauge field theory using the effective Lagrangian approach. The energy-momentum tensor has a term proportional to the space-time metric and provides a finite non-diverging contribution to the effective cosmological term. This allows to investigate the influence of the gauge field theory vacuum...
We summarize the famous tensions between various observational datasets and theoretical predictions of the Standard Model of Cosmology, such as the H0 and S8 tensions, that could be a sign that we are approaching New Physics. Then we provide possible solutions, arising from modifications /extensions of the standard lore.
This talk will address the challenges and necessary technological advances for accelerator and detector optimization, further R&D work on critical technologies within the ILC International Technology Network (ITN), and discuss plans on power, energy and sustainability for future Linear Collider facilities.
In this talk we will discuss models which allows the simultaneous generation of the baryon asymmetry of the Universe along with its dark matter content. We employ the out-of-equilibrium decays of heavy bath states into a feebly coupled dark matter particle and Standard Model charged fermions. These decays lead to dark matter production via the freeze-in mechanism and, assuming that they...
Silicon detectors are used in Nuclear and Particle Physics since the 60-ies. However, the real break-through came in the early 80-ies when micrometer-position resolution for charged particle was achieved and their superior performance for tracking down short-lived particles in the Particle Physics experiments demonstrated.
This presentation outlines the historical evolution from strip...
I discuss the entanglement entropy resulting from tracing out local degrees of freedom of quantum harmonic systems, which include free scalar field theory as a continuum limit. It is known that the entanglement entropy of such a system in its ground state is dominated by an area law term. This peculiar feature resembles the famous property of black hole entropy. I summarize the calculation of...
CAST is astroparticle physics experiment of CERN since 1999, searching mainly for axions. Without having observed as yet this theoretically postulated particle, CAST have further narrowed the phase space for the axion. Today, it is reasonable to say that the rest mass of this tiny particle is probably in the sub-meV range. Following a suggestion (with other 8 colleagues from 7 afiliations)...
The upcoming High Luminosity upgrade of the LHC will provide us with experimental data of unprecedented precision. Making sense of the data and exploiting the machine’s full potential will require theoretical predictions of equally high precision. In recent years, the theoretical particle physics community has made a tremendous effort to meet the challenge of performing notoriously difficult...
Supersymmetry (SUSY) remains one of the most appealing theories beyond the standard model (BSM) of elementary particles, due to its completeness, rich phenomenology, and ability to provide answers to fundamental open questions of modern particle physics and cosmology. The LHC Run II sample of pp collisions at 13 TeV center-of-mass energy collected with the CMS detector is a statistically...
