The quark-gluon plasma represents one of the most fascinating enigmas of particle physics, capturing the attention of researchers aiming to uncover the mysteries of the primordial universe. This state of matter, existing at extreme temperatures and densities, allows for probing the fundamental composition of matter even before classical particles such as protons and neutrons exist … Read more
In the vastness of the observable universe, a paradox arises for physicists: why does matter dominate antimatter when the fundamental laws of physics seem to favor an almost perfect symmetry between the two? This cosmic imbalance, called matter-antimatter asymmetry, has intrigued particle physics specialists for decades. At the heart of this enigma, CP violation appears … Read more
In brief : The fundamentals and the revolution initiated by the detection of gravitational waves Traditional astronomy primarily relies on the observation of electromagnetic waves, such as visible light, X-rays, gamma rays, or radio waves. These photons reveal a multitude of information about celestial objects, but certain phenomena remained inaccessible before the advent of gravitational … Read more
At the heart of contemporary cosmology research are the cosmic strings, these hypothetical narrow-dimensional objects capable of revealing previously unsuspected aspects of the primitive universe. Appearing in the first moments following the Big Bang, they represent topological defects in the very fabric of spacetime, creating a kind of deformed scar on a cosmic scale. Their … Read more
In the ever-expanding universe, galactic halos stand out as fascinating structures enveloping our familiar galaxies. These vast spherical regions are primarily composed of dark matter, an invisible substance that cannot be directly detected but whose gravitational influence is crucial for understanding modern cosmology. The study of galactic halos allows us to decipher the large-scale organization … Read more
Galactic hydrogen filaments represent one of the fundamental components of cosmic structure, drawing a complex network that shapes the visible universe. These gigantic chains of baryonic matter, primarily composed of neutral hydrogen clouds, play a crucial role in the intergalactic medium by orchestrating galaxy formation and the evolution of galaxy clusters. Thanks to recent advances … Read more
Cosmic inflation unveils a fascinating chapter in the history of the primitive universe, marking a period of frenzied expansion that precedes the formation of cosmic structures such as galaxies and star clusters. This theory, initially formulated in 1980 by physicist Alan Guth, offers a compelling explanation for several enigmas of the standard cosmological model, including … Read more
In brief: Between diffuse matter and stellar explosions, interstellar bubbles trace the dynamics of a cosmos in perpetual change. These hollow nebulae, sometimes visible in X-rays or in the radio domain, emerge as witnesses of the winds projected by massive stars or debris from ancient supernovae. The complex interaction between these stellar winds and the … Read more
At the heart of the first minutes of the Universe, a decisive phenomenon took place, marking the origin of matter as we know it today: primordial nucleosynthesis. This brief but intense period allowed the initial formation of light atomic nuclei, notably hydrogen, helium, and lithium. The story of this cosmic alchemy dives into an expanding … Read more
The cosmic microwave background (CMB) presents itself as an almost perfect and captivating imprint of what the Universe was like in its early moments, a true echo of the Big Bang enveloping the cosmos. This incessant radiation, invisible to the naked eye, has traversed nearly 14 billion years of expansion to provide us with crucial … Read more