Our current understanding of gravitational physics is being put to the test by numerous observational and experimental efforts aimed at different scales and field intensities, ranging from submillimeter physics to extreme compact objects, galaxies, and cosmology. It is now evident that the large-scale structure of the universe cannot be fully understood without a clear description of its microscopic (quantum) properties and symmetries and that a fully satisfactory theory requires a delicate equilibrium between many different scenarios. Understanding the nature and composition of compact objects is crucial for better understanding the most energetic astrophysical phenomena and the origin and evolution of structures. Additionally, a large number of cosmological observations seem to be implying that the very expansion of the universe predicted by the standard cosmological model shows significant tensions between different probes. Clarifying these and other cosmological tensions, as well as a number of large-angular-scale anomalies observed in the cosmic microwave background fluctuations, might lead to interesting new physics.

Progress in these challenging endeavors can only be accomplished by bringing together experts in all fields of gravitation and cosmology to share their ideas and findings in a relaxed and collaborative atmosphere. The second edition of Electronic Conference on the Universe (ECU 2023) hopes to provide such an atmosphere and to contribute to the exciting efforts in theoretical and observational cosmology and gravitational physics.

We hope that this new edition of ECU will bring together novel results on a variety of topics including weak and strong gravity, stellar models, classical and quantum aspects of black holes and other compact objects, gravitational waves, early- and late-time cosmology, and cosmological tensions and anomalies.

The Field Theory Committee welcomes the submission of abstracts on any topics related to the latest research and developments in the field. Related topics include but are not limited to: field theory of scalars, spinors, vectors, and higher rank tensors; Abelian gauge fields and quantum electromagnetics; non-Abelian gauge fields; weak interactions; strong interactions; standard model of physics; unified field theory; grand unified field theory; supersymmetric field theory; perturbative field theory; non-perturbative field theory; Feynman diagrams; conformal field theory; string field theory; continuous random fields; spontaneous symmetry breakdown; statistical field theory of many-body systems; spacetime symmetries; internal symmetries; the vacuum; renormalization; and (dynamical) Casimir effect.

In this session, we will cover a wide range of topics. As a matter of fact, this is an exciting period for High Energy Physics, as new results are expected from the experiments at the Large Hadron Collider the largest particle accelerator in the world, both from the analysis of the Run-2 data and from the new collisions data, taken after the restart. Additionally, neutrino, or astroparticle-physics, or nuclear experiments all over the world are collecting data which shed new light on the Stardard Model or the physics beyond it, and we welcome contributions from them. Special attention will be devoted to future strategies and new projects for the years to come. Here, we want to discuss the most recent and interesting experimental results together with the theoretical models needed to interpret them in the most coherent framework.

Keywords: particles physics; astroparticle physics; cosmoparticle physics; Standard Model; BSM models; dark matter; extra dimensions; nuclear physics

The talks in this section of the meeting will focus on the foundational principles and basic phenomenon of quantum mechanics as well as how these principles and phenomenon may lead to a theory of quantum gravity. On the basic quantum mechanics side this covers interpretations of quantum mechanics, entanglement, decoherence, Aharonov-Bohm effect, neutrino oscillations, quantum Zeno’s paradox, EPR theory/experiments, as well as other related principles and phenomena. On the quantum gravity side, the talks will focus on various phenomenological approaches to quantum gravity such as generalized uncertainty principle, double special relativity, non-commutative geometry, and others. We also welcome talks that focus on potential, near-term, experimental tests or observations that could provide evidence for the effects of quantum gravity.

We are living in an era of great discoveries in the field of planetary science, obtained thanks to the observations from Earth and many space missions. In this session we would like to highlight all the results in this field, together with the methodologies used. Contributions on missions under study, operational missions and missions already finished are also welcome. A non exhaustive list of topics is as follows:

• Science of inner planets;
• Science of outer planets;
• Science of planets’ moons;
• Science of minor bodies;
• Observations of solar system bodies;
• Astrodynamics concepts and tools;
• Current space exploration missions: dynamical and geological results;
• Future space exploration missions: concepts, data simulations, scientific goals;
• Fundamental physics, tests of General Relativity and alternative theories of gravitation in space.

The imminent arrival of JWST images, the upcoming of deep sky surveys from LSST and Euclid, and the new insights in the radio domain from large interferometers like SKA, are expected to provide a big revolution in our understanding of Galaxies and Clusters. Several problems are still open in this area and waiting for new ideas and solutions.

The "Galaxies and Clusters" session will host all contributions related to "galaxies" and "clusters", in particular if based on a multi-wavelength approach: studies of high redshift galaxies/clusters and more technical papers, addressing the progresses of data analysis/reduction, for low surface brightness objects are both welcome.

Keywords: galaxies and clusters; structure, formation and evolution; gas, stars and dark matter; galaxies and clusters at different wavelengths; high redshift galaxies and clusters; low surface brightness galaxies; new data-reduction approaches.

In this session, we would like to highlight the latest research developments in the field of compact objects. This is a vast area ranging from nuclear and particle physics all the way to general relativity and alternative theories of gravitation as well as astrophysics and multimessenger observations. We welcome both theoretical and observational studies of black holes, neutron stars, white dwarfs and more speculative objects that might exist in the Universe. Relevant topics include the formation of such compact objects, their environment, their internal constitution, their structure, their evolution and their astrophysical manifestations.

Studying the Sun-as-a-star analog and the extension to stellar environments is one of the main building blocks of our understanding of astrophysics. This is because the proximity of the Sun to Earth allowed the in-depth monitoring and modeling of our host star and its effects and impact on our planetary system. We aim to bring together the Stellar and Solar Physics communities and enhance synergies among these two research areas.

The session brings together scientists from all fields of research related to solar, stellar, astrophysical, and exoplanetary sciences. It will allow the sharing of expertise amongst researchers working on different aspects of this interdisciplinary scientific field, allowing showcases of recent advancements in the field of specialization.

We solicit contributions related but not limited to:

• Modeling stellar astrospheres and the corresponding energy-dependent cosmic ray flux;
• Modeling stellar Coronal Mass Ejections (CMEs);
• Evaluation and quantification of the solar UV-, X-ray, and energetic particle flux relationships and their extension to the stellar environment;
• The imprint of the stellar radiation field by modeling the magnetospheric transport and particle interactions within (exo)planetary atmospheres;
• Atmospheric modeling studies of climate and (biosignature) photochemistry and the influence of stellar activity.

Keywords: stellar radiation environment, CMEs, solar/stellar flares, habitability.

We are very pleased to welcome abstracts/papers to this Session on all main areas of high current interest in modern astronomy, astrophysics and cosmology, covering the different important subjects, tools and approachs in these disciplines: Theory, models, numerical simulations, experiments, real data observations, their several interplays and enriching cross-correlations, as well as emerging and new inter-disciplinary topics.

Abstracts/papers can be submitted by women scientists in these areas: They can be individual submissions or as first author within collaborations, including man scientists too, research networks or big collaborative/experimental groups. Young women scientists, as well as post-doctoral and advanced doctoral young woman students, are encouradged to participate.

We are pleased to inform here too about the related and sucessful Topical Collection "Women Physicists in Astrophysics, Cosmology and Particle Physics" which have already published 12 articles and continue to welcome papers without submission deadline, that can be of your interest and that of your colleagues:

https://www.mdpi.com/journal/universe/special_issues/WomenAstroCosmo

As well as to the successfull 2021 Webinar on this topical Collection:

https://www.youtube.com/watch?v=_wBvQMNZxfs

Please feel free to share this information openly. We are looking forward to welcoming you and your contributions in this Session and very interesting Electronic Meeting!