Modified Gravity Makes Galaxies Brighter

@article{Davis2011ModifiedGM,
  title={Modified Gravity Makes Galaxies Brighter},
  author={A. C. Davis and Eugene A Lim and Jeremy Sakstein and Douglas J. Shaw},
  journal={Physical Review D},
  year={2011},
  volume={85},
  pages={123006}
}
We investigate the effect of modifed gravity with screening mechanisms, such as the chameleon or symmetron models, upon the structure of main sequence stars. We find that unscreened stars can be significantly more luminous and ephemeral than their screened doppelgangers. By embedding these stars into dwarf galaxies, which can be unscreened for values of the parameters not yet ruled out observationally, we show that the cumulative effect of their increased luminosity can enhance the total… 

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References

SHOWING 1-10 OF 14 REFERENCES

Astrophys

  • J. 121, 161
  • 1955

I and J

Phys

  • Rev. D75, 063501
  • 2007

Our convention differs from that of

  • HNS) by g HNS µν

Phys

  • 14 Rev. D79, 083518
  • 2009

Phys

  • Rev. D69, 044026
  • 2004

Nucl

  • Phys. B423, 532
  • 1994

JCAP 0808

  • 010
  • 2008

Phys

  • Lett. B699, 5
  • 2011

Phys

  • Rev. Lett. 97, 151102
  • 2006