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X-WR-CALDESC:Events for Theoretical Physics
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TZID:Asia/Krasnoyarsk
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TZOFFSETFROM:+0700
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DTSTART:20250101T000000
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DTSTART;TZID=Asia/Krasnoyarsk:20261016T133000
DTEND;TZID=Asia/Krasnoyarsk:20261016T170000
DTSTAMP:20261007T082741Z
CREATED:20261007T080342Z
LAST-MODIFIED:20261007T082741Z
UID:31078-1792157400-1792170000@www.if.nu.ac.th
SUMMARY:No.40 IF Colloquium – Crossing the Phantom Divide: Difficulties and Solutions
DESCRIPTION:Speaker: Dr. Nandan RoyVenue: Academia Room (TA212)\, 2nd Floor\, Mahadhammaraja A Building \n\n\n\n\n\n\nAbstract\n\n\n\n\n\nThe nature of cosmic acceleration remains one of the central open questions in cosmology. Recent observations have renewed interest in dynamical dark-energy scenarios in which the equation of state evolves across the cosmological-constant boundary\, w_DE = -1\, known as the phantom divide. Realizing such a crossing consistently is theoretically nontrivial\, since it can be difficult to achieve in simple scalar-field models without introducing instabilities. \n\n\n\nIn this talk\, I will discuss a scalar–vector–tensor dark-energy model in which scalar and vector degrees of freedom work together to produce a stable crossing of the phantom divide. The vector sector drives the dark-energy equation of state into the phantom regime at earlier times\, while a canonical scalar field subsequently drives it toward w_DE > -1 at late times. I will then discuss observational constraints from Type Ia supernovae\, DESI baryon acoustic oscillations\, cosmic microwave background information\, and measurements of structure growth. Finally\, I will highlight what these results tell us about the possibility of dynamical dark energy beyond the standard LambdaCDM cosmology. \n\n\n\n\n\n\n\nKeywords\n\n\n\n\n\nDynamical dark energy\, Phantom divide\, Scalar-vector-tensor models \n\n\n\n\n\n\n\n\n\n    \n    \n\n    \n        \n        📌\n        \n            IF – Naresuan University\n            Tha Pho\, Phitsanulok\n            Click to open Maps ↗
URL:https://www.if.nu.ac.th/event/no-40-if-colloquium-crossing-the-phantom-divide-difficulties-and-solutions/
ATTACH;FMTTYPE=image/webp:https://www.if.nu.ac.th/wp-content/uploads/2026/10/69-Colloqium40.webp
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