Event Category: 4D Seminar

4D Seminar series:
Monday at 2:30 on campus

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Abstract: Inspired by the second law of thermodynamics, we study the change in subsystem entropy generated by dynamical unitary evolution of a product state in a bipartite system. Working at leading order in perturbative interactions, we prove that the quantum n-Tsallis entropy of a subsystem never decreases provided that subsystem is initialized as a statistical mixture of states of equal … Read More

Abstract: The talk will focus on the testability prospects of the minimal GeV-scale type-I see saw model and the associated leptogenesis mechanism within future experiments as SHiP and FCC-ee. I will review the relation between the generation of the light neutrino masses and the baryon asymmetry (BA). We will show that the parameter space corresponding to a softly broken lepton … Read More

Abstract: High-pT tails of Drell-Yan processes can provide a useful complementary probe of semi-leptonic interactions compared to low-energy observables and electroweak precision tests. For this purpose, we provide a general decomposition of the pp → lν and pp → ll scattering amplitudes in terms of form-factors that we match to specific scenarios, such as the Standard Model Effective Field Theory … Read More

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abstract:In this seminar I will talk about wave dark matter and its intriguing phenomenological implications, namely the presence of wave-like signatures on astrophysical length scales. Specifically, I assume the dark matter is composed of light bosons with masses below 10 eV, allowing, due to the high phase space occupation number, for a classical wave description. I will illustrate a formalism … Read More

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As we are starting the semester, each of the group will briefly introduce themselves and give a few minutes summary of their research interests.

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Abstract: The search for dark matter is indisputably now a multi-disciplinary and multi-decadal effort. Among models and methods that have expanded tremendously in scope, astrophysical indirect detection remains one of the best and sometimes only ways to challenge the well-worn–but undeniably compelling–notion of the thermal relic WIMP.   Among the best-motivated classical WIMP candidates, the most elusive under experimental scrutiny has … Read More

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Abstract: Even though it has been half a century since Quantum Chromodynamics (QCD) has been identified as the fundamental theory of the strong interactions,  the non-perturbative nature of QCD has placed large restriction on the physical phenomena that can be directly obtained from the theory. Lattice QCD, being a non-perturbative framework, provides a promising pathway towards studying QCD eigenstates and their … Read More

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Abstract: Using a heavy mass expansion we build an EFT for nonrelativistic DM of any spin, coupling to quarks, gluons and photons. We find the relations imposed by the reparametrization invariance, and provide the matching onto the interaction basis of nonrelativistic DM interacting with norelativistic nucleons (NRET). The construction retains the attractive features of the NRET approach, i.e. it works … Read More

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Abstract: Today’s lattice QCD program, developed over decades, provides celebrated quantitative insight into nonperturbative physics, for example, via ab initio hadron spectroscopy. The entire computational framework, however, is based on importance sampling of the imaginary-time path integral—a method that is infected by sign problems for various calculations of interest. By contrast, it turns out that imaginary time and path integrals are … Read More

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Abstract: Theories with spontaneously broken conformal symmetry are ubiquitous in models for new physics, with examples including composite Higgs and conformal dark sectors. These models require a mechanism to stabilize the scale of symmetry breaking. Moreover, the stabilization mechanism affects the phenomenology of the dilaton, the pseudo-Goldstone boson of broken scale invariance, as well as the conformal phase transition. I … Read More