[Astro] [CAPT] Particle Cosmology and Gravity Seminar this week: William Giarè

[Elisa Todarello (staff)]

Dear All,

                  We have a seminar this week. The details are provided below -

Kind regards,
Elisa
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Speaker: William Giarè (Sheffield)

Seminar date: October 7th , Tuesday, 1 pm UK time

Venue: Seminar Room A 113 (Cripps North Building, CAPT)


Title: Lost Beyond ΛCDM


Abstract: As cosmological observations reach unprecedented precision, the standard ΛCDM model is facing mounting pressure on multiple fronts. The well-known Hubble tension — a persistent  discrepancy between early- and late-universe determinations of the Hubble constant — challenges the foundations of our baseline paradigm. At the same time, recent Baryon Acoustic Oscillation measurements from DESI suggest bounds on the sum of neutrino masses that increasingly conflict with lower limits from particle physics, assuming standard cosmology. Extensions to the dark energy sector, particularly evolving dark energy models, can alleviate the neutrino mass tension and even appear to disfavor a cosmological constant at ~3-4σ. Yet these scenarios generally fail to address the Hubble tension. Conversely, both early- and late-time solutions proposed for the Hubble tension often drive the neutrino mass toward unrealistically small values, worsening the conflict with particle physics. This raises a natural question: is a coherent framework capable of reconciling all datasets still within reach, or is the cosmological blanket simply too short, such that pulling to cover one discrepancy inevitably leaves another exposed? In this talk, I will explore the web of tensions currently plaguing modern cosmology, and outline possible pathways into the beyond-ΛCDM landscape.


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Link to join:

 https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d


List of upcoming Seminars:

Oct 14th: William Coulton (Cambridge)
Oct 21st: Fiona McCarthy (Cambridge)
Oct 28th: Jack Shergold (Liverpool)
Nov 4th: Usama Aqeel (Nottingham)
Nov 18th: Benjamin Muntz (Nottingham)
Nov 25th: Fraser Cowie (Oxford)
Dec 2nd: Violetta Sagun (Southampton)
Dec 9th: James Alvey (Cambridge)

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