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SUMMARY:Contributory: Aspects of Spontaneous Symmetry Breaking in Cosmolog
 y
DTSTART;VALUE=DATE-TIME:20261117T094500Z
DTEND;VALUE=DATE-TIME:20261117T100000Z
DTSTAMP;VALUE=DATE-TIME:20261026T222810Z
UID:indico-contribution-955@indico.narit.or.th
DESCRIPTION:Speakers: Malavika K (Vellore Institute of Technology)\nWe exp
 lore if a late-time cosmic acceleration and a mild variation of fundamenta
 l constants can be accommodated within a common scalar-tensor framework. T
 he fundamental constants we focus on are the Newtonian gravitational coupl
 ing $G$ and the electron mass $m_e$. The scalar-tensor framework under con
 sideration is a generalized Brans-Dicke theory with an additional matter f
 ield. The viability of this framework is explored in the context of well-e
 stablished late-time cosmic expansion history\, namely\, a standard $\\Lam
 bda$CDM expansion and an extended $\\Lambda$CDM expansion (where a rationa
 l (Pad\\'e-like) deformation is considered). We reconstruct and show that 
 the resulting effective potential of the matter field naturally develops a
  Higgs-like symmetry-breaking structure with a redshift-dependent mass ter
 m\, leading to a mild evolution of the vacuum expectation value. This vari
 ation leads to an evolution of proton-to-electron mass ratio $\\mu$ which 
 is compared with observational bounds derived from quasar absorption spect
 ra. We find that in order to accommodate a reasonably mild variation of $\
 \mu$\, the Brans-Dicke scalar field must behave as a chameleon.\n\nhttps:/
 /indico.narit.or.th/event/234/contributions/955/
LOCATION:Pattaya\, Thailand D Varee Jomtien Beach Pattaya Hotel
URL:https://indico.narit.or.th/event/234/contributions/955/
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