Comment on "21-cm Radiation: A New Probe of Variation in the Fine-Structure Constant"

Details Comment on "21-cm Radiation: A New Probe of Variation in the Fine-Structure Constant" Comment on "21-cm Radiation: A New Probe of Variation in the Fine-Structure Constant"

2010-04-15

arxiv.org/abs/1004.2540v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Added In v2: discussion of the effect of the variation of the fundamental constants on extracted numerical value of the barion

Scientific paper

Khatri and Wandelt reported that change in the value of alpha by 1% changes the mean brightness temperature $T_b$ decrement of the CMB due to 21 cm absorption by 5% over the redshift range z $<$ 50. A drawback of their approach is that the dimensionful parameters are used. Changing of units leads to the change of the magnitude and even sign of the effect. Similar problems may be identified in a large number of other publications which consider limits on the variation of alpha using dimentionful parameters. We propose a method to obtain consistent results and provide an estimate of the effect.

Affiliated with

Also associated with

No associations

Rating

Comment on "21-cm Radiation: A New Probe of Variation in the Fine-Structure Constant" does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Comment on "21-cm Radiation: A New Probe of Variation in the Fine-Structure Constant", we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Comment on "21-cm Radiation: A New Probe of Variation in the Fine-Structure Constant" will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-379429