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SUMMARY:Cosmic Magnetism Across Scales and Epochs
DTSTART:20260603T103000Z
DTEND:20260603T123000Z
DTSTAMP:20260618T215100Z
UID:indico-event-9358@scitalks.tifr.res.in
DESCRIPTION:Speakers: Pallavi Bhat (ICTS)\n\nFrom the early Universe to ga
 laxies and accreting black holes\, magnetic fields appear across a wide ra
 nge of scales and epochs\, yet their origin and evolution remain fundament
 al open questions. In this talk\, I will discuss recent advances in our un
 derstanding of magnetic-field evolution in turbulent astrophysical plasmas
 . I will begin in the early Universe\, where our work has uncovered the ro
 le of reconnection in the nonlinear evolution of primordial magnetic field
 s\, leading to inverse transfer of magnetic energy. This can potentially e
 xplain the magnetic fields inferred in cosmic voids from gamma-ray observa
 tions.\nI will then turn to gravitationally bound structures. During colla
 pse\, turbulent dynamos can amplify magnetic fields far more rapidly than 
 in stationary systems. I will show how the evolving background flow associ
 ated with collapse accelerates dynamo action\, potentially explaining the 
 early emergence of strong magnetic fields in high-redshift galaxies.\nFina
 lly\, I will discuss magnetic-field generation in accretion disks around c
 ompact objects. In these systems\, turbulence driven by the magneto-rotati
 onal instability sustains dynamo action\, producing magnetic fields that r
 egulate angular-momentum transport and influence the launching and evoluti
 on of astrophysical jets. I will highlight recent efforts to understand ho
 w disk dynamos connect to the formation of some of the most energetic outf
 lows observed in the Universe. \n\nhttps://scitalks.tifr.res.in/event/935
 8/
LOCATION:AG66
URL:https://scitalks.tifr.res.in/event/9358/
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