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Abstract: We investigate the azimuthal asymmetries such as $\cos2{\phi_T}$ and Sivers symmetry for $J/\psi$ and $\pi^\pm$ production in electron-proton scattering, {focusing on scenarios where} the $J/\psi$ and the pion are produced in {an} almost back-to-back configuration. The electron is unpolarized, while the proton can be unpolarized or transversely polarized. For the $J/\psi$ formation, we use non-relativistic QCD (NRQCD), while $\pi^\pm$ is formed due to parton fragmentation. In this kinematics, we utilize the transverse momentum-dependent factorization framework to calculate the cross sections and asymmetries. We consider both quark and gluon-initiated processes and show that the gluon contribution dominates. In this work, we used the generalized parton model (GPM) for the TMD parametrizations and did not consider the effect of TMD evolution. We provide numerical estimates of the upper bounds on the azimuthal asymmetries, as well as employ a Gaussian parametrization for the gluon transverse momentum distributions (TMDs), within the kinematical region accessible by the upcoming Electron-Ion Collider (EIC). Title: Finite parts of inflationary loops Speaker: Flavio Riccardi (IFT, Madrid) Abstract: The objective of this talk is to present a systematic approach for calculating loop corrections, including finite contributions, to the power spectrum in a cosmological setting. Particular emphasis will be placed on the renormalization procedure, comparing the results obtained using different regularization methods. As an application, this method will be applied to a clear and straightforward case: the computation of the one-loop power spectrum for tensor modes generated by slow-roll inflationary dynamics. How fast can protons decay? Date: Wednesday, Feb. 5th, 2025 Title: Quantum Technologies for Fundamental Physics Speaker: Diego Blas Abstract: My aim in this talk is to describe some simple examples related to the detection of gravitational waves, dark matter and neutrinos TITLE: Deformed Commutation Relations in Quantum Cosmology SPEAKER: Gabriele Barca ABSTRACT: General Relativity predicts its own breakdown in the form of DATE: MONDAY, FEB. 12, 2025 LOCATION: Theoretical Physics Seminar Room Departamento de Química Física ——————————————————————————————– TÍTULO: Computación Cuántica Departamento de Química Física UPV/EHU ——————————————————————————————– UPV/EHU ——————————————————————————————– TÍTULO: Física de Partículas Departamento de Física UPV/EHU Certification of high-dimensional and multipartite entanglement with imperfect measurements Deciding whether an unknown quantum state is entangled is one of the central challenges of quantum information. The most common approach are entanglement witnesses, where one assumes the state to be close to a known target and then finds suitable measurements that can reveal its entanglement. In principle, this allows for the detection of every entangled state. However, it requires the experimenter to flawlessly perform the stipulated measurements. We move away from this idealized scenario to the more realistic situation in which measurement devices are not perfectly controlled, but nevertheless operate with bounded inaccuracy. We formalize this through an operational notion of inaccuracy that can be estimated directly in the laboratory and investigate the impact of measurement errors on standard entanglement detection techniques. To demonstrate the relevance of this approach, we show that small magnitudes of inaccuracy can significantly compromise several renowned entanglement witnesses. We extend this analysis to the detection of high-dimensional and multipartite entanglement. To support our theoretical findings experimentally, we explicitly construct states that lead to a wrongful detection of high Schmidt numbers or genuine multipartite entanglement when the inaccuracies in the measurements are not accounted for. TITLE: SPEAKER: ABSTRACT:
DATE: MONDAY, MAY 21st, 2025 LOCATION: Theoretical Physics Seminar Room
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https://arxiv.org/abs/2410.19045
February 2025
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Time: 11:40 am
Place: 1.A1 (Faculty of Science & Technology, Leioa, UPV/EHU)
ICREA & Institut de Física d’Altes Energies (IFAE), Barcelona.
The cutting-edge frontier of quantum technologies is expanding the possibilities of sensing phenomena of constantly decreasing
intensity. As a result, the new advances in metrology offer a fantastic opportunity to advance in some of the most pressing open
problems of particle physics and cosmology related to different fundamental backgrounds criss-crossing our laboratory devices
or other subtle phenomena related to yet-to-be discovered physics.
with quantum devices, and how their implementation may revolutionise our understanding of particle physics and cosmology.
spacetime singularities, but quantum effects are expected to play a role
in the high-energy regimes before singularities are reached. In
particular, the cosmological dynamics close to initial singularities
such as the Big Bang is the perfect arena to test Quantum Gravitational
effects. The formalism of Deformed Commutation Relations (DCRs) was
developed to easily implement on any Hamiltonian system effects and
properties expected from Quantum Gravity theories, such as minimal
lengths or energy cut-offs. I will introduce the main properties of
these DCRs, both on a quantum and on a (semi)classical level, in one
space dimension or higher. Then I will show how some specific forms can
be used in various cosmological models to introduce Quantum
Gravitational corrections, to remove singularities, to tame Chaos, and
to derive other interesting effects.
TIME: 11:40 am
TÍTULO: Tecnologías Cuánticas
SPEAKER: Jorge Casanova
EHU Quantum Center
UPV/EHU
SPEAKER: Mikel Sanz
EHU Quantum Center
TÍTULO: Materia Condensada
SPEAKER: Maria Blanco
Polímeros y Materiales Avanzados
Física, Química y Tecnología
SPEAKER: Miguel Garcia Echevarria
EHU Quantum Center
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TIME: 11:40 am
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