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SUMMARY:Addressing the DESI DR2 Phantom-Crossing Anomaly and Enhanced $H_0
 $ Tension with Reconstructed Scalar-Tensor Gravity
DTSTART;VALUE=DATE-TIME:20260916T125000Z
DTEND;VALUE=DATE-TIME:20260916T131500Z
DTSTAMP;VALUE=DATE-TIME:20261027T132419Z
UID:indico-contribution-31295@indico.ific.uv.es
DESCRIPTION:Speakers: Leandros Perivolaropoulos ()\nRecent cosmological da
 ta\, including DESI DR2\, highlight significant tensions within the $\\Lam
 bda$CDM paradigm. When analyzed in the context of General Relativity (GR)\
 , the latest DESI data favor a dynamical dark energy (DDE) equation of sta
 te\, $w(z)$\, that crosses the phantom divide line $w=-1$. However\, this 
 framework prefers a lower Hubble constant\, $H_0$\, than Planck 2018\, the
 reby worsening the tension with local measurements. This phantom crossing 
 is a key feature that cannot be achieved by minimally coupled scalar field
 s (quintessence) within GR. This suggests the need for a new degree of fre
 edom that can simultaneously: (A) increase the best-fit value of $H_0$ in 
 the context of the DESI DR2 data\, and (B) allow the crossing of the $w=-1
 $ line within a new theoretical approach. In this talk I will demonstrate 
 that both of these goals may be achieved in the context of Modified Gravit
 y (MG)\, and in particular\, Scalar-Tensor (ST) theories\, where phantom c
 rossing is a natural and viable feature.\n\nhttps://indico.ific.uv.es/even
 t/8160/contributions/31295/
LOCATION:
URL:https://indico.ific.uv.es/event/8160/contributions/31295/
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