Researchers at SISSA propose that dark matter mini-halos in the universe might reveal the presence of primitive magnetic fields, offering brand-new insights into the early universe and the nature of cosmic magnetic fields. An appealing possibility is that magnetic fields originated near the birth of the universe itself, that is they are primordial magnetic fields.In the study, researchers revealed that if magnetic fields are undoubtedly prehistoric then it could trigger a boost in dark matter density perturbations on small scales. The ultimate result of this procedure would be the formation of mini-halos of dark matter, which, if spotted would hint towards a primordial nature of magnetic fields.Thus, in an apparent paradox, the unnoticeable part of our Universe could be useful in dealing with the nature of a part of the noticeable one.In the research study, scientists showed that if magnetic fields are undoubtedly primitive then it could trigger a boost in dark matter density perturbations on little scales. Credit: Lucie ChrasteckaShedding Light on the Formation of Magnetic Fields” Magnetic fields are common in the Cosmos,” discusses Pranjal Ralegankar of SISSA, the author of the research.
Scientists at SISSA propose that dark matter mini-halos in deep space could expose the presence of primitive electromagnetic fields, providing brand-new insights into the early universe and the nature of cosmic magnetic fields. Credit: SciTechDaily.com We do not know how electromagnetic fields formed. Now new theoretical research study tells how the undetectable part of our Universe might help us find it, suggesting a prehistoric genesis, even within a second of the Big Bang.The mini-halos of dark matter spread throughout the Cosmos might operate as highly delicate probes of primordial electromagnetic fields. This is what emerges from a theoretical study carried out by SISSA and released in the journal Physical Review Letters.Present on enormous scales, electromagnetic fields are found everywhere in deep space. However, their origins are still topics of argument among scholars. An interesting possibility is that magnetic fields came from near the birth of the universe itself, that is they are primitive magnetic fields.In the research study, researchers revealed that if electromagnetic fields are undoubtedly primitive then it could trigger a boost in dark matter density perturbations on small scales. The supreme impact of this procedure would be the formation of mini-halos of dark matter, which, if found would hint towards a primordial nature of magnetic fields.Thus, in an obvious paradox, the invisible part of our Universe could be beneficial in resolving the nature of a component of the visible one.In the study, researchers revealed that if electromagnetic fields are certainly primitive then it might trigger a boost in dark matter density perturbations on little scales. The supreme impact of this procedure would be the formation of mini-halos of dark matter, which, if identified would hint towards a primitive nature of magnetic fields. Credit: Lucie ChrasteckaShedding Light on the Formation of Magnetic Fields” Magnetic fields are common in the Cosmos,” describes Pranjal Ralegankar of SISSA, the author of the research study. “A possible theory regarding their development suggests that those observed so far could be produced in the early phases of our Universe. This proposal lacks explanation in the basic design of physics.To shed light on this aspect and find a way to identify “primordial” magnetic fields, with this work we propose a technique that we could specify as indirect. Our method is based on a question: What is the influence of electromagnetic fields on dark matter?” It is understood that there is no direct interaction. Still, as Ralegankar explains, “there is an indirect one that happens through gravity.” Right From the Primordial UniversePrimordial electromagnetic fields can improve density perturbations of electrons and protons in the primitive Universe. They influence the magnetic fields themselves when these ended up being too big. The repercussion is the suppression of changes on a little scale.Ralegankar describes: “In the research study, we reveal something unforeseen. The development in baryon density gravitationally induces the growth of dark matter perturbations without the possibility of subsequent cancellation. This would result in their collapse on little scales, producing mini-halos of dark matter.” The repercussion, continues the author, is that although variations in the density of baryonic matter are canceled, they would leave traces through the mini-halos, all entirely through gravitational interactions.” These theoretical findings,” concludes Pranjal Ralegankar, “also recommend that the abundance of mini-halos is determined not by the present existence of prehistoric electromagnetic fields however rather by their strength in the primordial Universe. Thus, a detection of dark matter mini-halos would enhance the hypothesis that electromagnetic fields formed very early, even within 1 2nd after the Big Bang.” Reference: “Dark Matter Minihalos from Primordial Magnetic Fields” by Pranjal Ralegankar, 8 December 2023, Physical Review Letters.DOI: 10.1103/ PhysRevLett.131.231002.