Wed 06 Mar 13:15: The Nature of Dark Matter with Lyman-Alpha Forest
The existence of dark matter, which constitutes 85% of the matter density and 26% of the total energy density, is clearly demonstrated by cosmological observations of the Universe. And yet, very little is known about the nature of dark matter. The observations support the ‘cold dark matter’ (CDM) paradigm, in which the dark matter is a heavy particle, with little to no interactions through fundamental forces other than gravity. The cosmological and astrophysical observations of dark matter’s gravitational interaction currently provide the only robust evidence of dark matter. These observations typically rely on characterising the distribution of matter in the Universe. A dark matter particle that is lighter than the standard CDM paradigm predicts imprints a suppression of structure in the matter distribution. The exact scale where this happens is most often linked to the mass of the dark matter particle. I will present new results on the thermal relic warm dark matter constraints using the high-redshift cosmic web as traced by the Lyman-alpha forest.
- Speaker: Vid Iršič
- Wednesday 06 March 2024, 13:15-13:40
- Venue: The Hoyle Lecture Theatre + Zoom .
- Series: Institute of Astronomy Seminars; organiser: .
Ashes to ashes, dust to dust: the cosmic fertiliser that fuelled the origins of life
The origin of life is an event so rare that, to the best of our knowledge, it has only happened once: here on Earth. The questions of how life developed and in what environments geochemical reactions took place are fundamental questions that span the fields of astrobiology, organic chemistry, and geology. One key...
Insights into Dark Matter's 'Coldness' Open New Cosmic Frontiers
cdm_2_copy.jpg In their latest research on dark matter scientists have collected vital clues about the ‘coldness’ of the mysterious component making up 80% of all matter, revealing a deep connection between dark matter and the formation of galaxies in the early Universe. With the help of powerful telescopes, the...
Douglas Gough awarded The Crafoord Prize in Astronomy
The Crafoord Prize in Astronomy The Crafoord Prize in Astronomy 2024 is awarded to Douglas Gough , University of Cambridge, UK, Jørgen Christensen-Dalsgaard , Aarhus University, Denmark, and Conny Aerts , KU Leuven, Belgium “for developing the methods of asteroseismology and their application to the study of the interior...
ESA gives go-ahead for flagship gravitational-wave observatory in space
germl2rwwaa-rym.jpeg Following today´s Adoption, the LISA mission advances to the construction phase LISA, the Laser Interferometer Space Antenna, has passed a major review with flying colours: the entire concept - from the definition of the overall mission and operations to the space hardware to be built - stood up to the...
International team awarded $3.7M to build a next generation haloscope to search for the axion
hp_dec_23_art.jpeg Physics breakthroughs don’t always require city-sized particle colliders or giant radio telescope arrays. The Gordon and Betty Moore Foundation , the Simons Foundation , the Alfred P. Sloan Foundation and the John Templeton Foundation have partnered to fund 11 innovative “tabletop” experiments, many of...
Webb reveals that galaxy mergers are the solution to early Universe mystery
weic2402a-2.jpg One of the key missions of the NASA/ESA/CSA James Webb Space Telescope is to probe the early Universe. Now, the unmatched resolution and sensitivity of Webb’s NIRCam instrument have revealed, for the first time, what lies in the local environment of galaxies in the very early Universe. This has solved one...
Bouncing comets could deliver building blocks for life to exoplanets
How did the molecular building blocks for life end up on Earth? One long-standing theory is that they could have been delivered by comets. Now, researchers from the IoA have shown how comets could deposit similar building blocks to other planets in the galaxy. In order to deliver organic material, comets need to be...