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SUMMARY:A Non Singular Cyclic Universe from Modified Gravity
DTSTART;VALUE=DATE-TIME:20261109T033000Z
DTEND;VALUE=DATE-TIME:20261109T040000Z
DTSTAMP;VALUE=DATE-TIME:20261023T120243Z
UID:indico-contribution-2966@indico.itp.ac.cn
DESCRIPTION:Speakers: Dhiraj Kuniyal (Department of Physics and Astrophysi
 cs\, University of Delhi\, Delhi 110007\, India)\nThe Big Bang singularity
  marks a fundamental breakdown of General Relativity\, yet all proposed qu
 antum gravitational remedies invoke microphysical assumptions beyond the o
 bservational reach. We show that a minimal\, purely classical modification
  of the gravitational potential --- preserving the inverse-square law wher
 e tested\, but free to depart at unmeasured scales --- is sufficient to pr
 oduce a non-singular\, cyclic universe. The resulting modified gravitation
 al formulation leads to a cosmic evolution exhibiting a bounce at a finite
  minimum size\, followed by a regime closely akin to the concordant $\\Lam
 bda$CDM model\, and an eventual collapse to another bounce. Cosmic Chronom
 eter\, Supernovae type Ia\, Baryon Acoustic Oscillation\, Cosmic Microwave
  Background and Nucleosynthesis data constrain both the new length scales\
 , implying a cycle period of ${\\simeq}\\\,89\\\,\\mathrm{Gyr}$\, and this
  framework --- subsuming a broad class of bounce scenarios within a single
  testable model --- opens a direct route for distinguishing cyclic cosmolo
 gies from $\\Lambda$CDM.\n\nhttps://indico.itp.ac.cn/event/417/contributio
 ns/2966/
LOCATION:
URL:https://indico.itp.ac.cn/event/417/contributions/2966/
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