Banca de DEFESA: MARCELO FERREIRA DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARCELO FERREIRA DA SILVA
DATE: 11/08/2023
TIME: 14:00
LOCAL: online
TITLE:

Is the speed of light varying by using  Planck satellite and galaxy clusters observations?

KEY WORDS:

new physics, galaxy clusters, Planck satellite, speed of light

PAGES: 91
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

The speed of light plays a fundamental role throughout the theoretical physics. Any variation in this quantity can  lead to deep modifications on  our understanding of nature. In this dissertation, we performed a test for  temporal constancy of  speed of light by using   measurements from the Planck satellite (more precisely, the values of $\Omega_M$ and $\Omega_b$), the galaxy clusters gas mass fraction and SNe data. However, cosmological analyzes via galaxy clusters strongly depend on the mass measurements  of these structures. In our analyses, we considered three different values for the mass calibration factor ($K$) found in the literature, one of them coming from the Planck observations. We found that when the value of $K$ used was not that of the Planck satellite, a possible temporal variation of the speed of light was verified. This result shows a possible tension between the constancy of the speed of light, the values of $\Omega_M$ and $\Omega_b$ (from Satellite Planck) and the values of $K$ obtained independently from that of the Planck satellite.

COMMITTEE MEMBERS:
Interno - 1672854 - RAIMUNDO SILVA JUNIOR
Presidente - 1390849 - RODRIGO FERNANDES LIRA DE HOLANDA
Externo à Instituição - SAULO HENRIQUE PEREIRA - UNESP