Recent content by Floyd_13

Liddle (2015, p.67) writes: "From the crude estimates that a typical galaxy weighs about ##10^{11}M\odot## and that galaxies are typically about a megaparsec apart, we know that the Universe cannot be a long way from the critical density." Was this fact (i.e. that the actual density is likely...

I am looking for examples of Modified Gravity theories that have been developed with the aim of dispensing dark matter, besides Milgrom's [MOND][1], Bekenstein's [TeVeS][2], and the recent relativistic version of MOND ([RMOND][3]) by Skordis and Zlosnik. Are there any other examples of similar...

It is often said that one of the drawbacks of the standard model is that it has many free parameters. My question is two-fold: What exactly is a free parameter? My understanding is that the free parameters of a model/theory are the ones that cannot be predicted by the theory and need to be...

I have actually, but unfortunately it doesn't say much about dark matter.

Hello, could you please recommend some good introductory textbooks for studying core topics in astrophysics/cosmology, and especially dark matter? I know that 'An Introduction to Modern Astrophysics' by Caroll and Ostlie is a good book, but I 'm looking for something more concise, so to speak...

Thanks for the response. Can you please provide any references with specific examples or even better a review paper for these?

This is probably a long shot but it's worth trying. My question is the following: What properties of dark matter can we derive from each of the available methods for probing the physics of dark matter? To elaborate a bit, my understanding is that the evidence for dark matter comes from its...

Thank you both for your answers. @ChrisVer can you please point out any references for the new limits for KK particles? I don't seem to have access to the plot you mention.

I'm reading this article on Dark Matter and at some point the authors say '' if the LKP [Lightest Kalusa-Klein Particle] is to account for the observed quantity of dark matter, its mass [...] should lie in the range of 400 to 1200 GeV, well above any current experimental constraint.'' My...

I am looking for introductions and reviews (papers or books) on the possible observation and the nature of dark matter. This book seems to be a good start, but I would be grateful for any other recommendations that are accessible to people with knowledge of physics at the undergraduate level...

I'm currently reading various papers on the violation of Lepton Flavour Universality in rare B-decays and I would appreciate some help in understanding the methodology for measuring the ratios in these decays. Here is a quote from a recent paper from the LHCb collaboration (p.5): My question...