Coin raised a cluster of interesting issues for discussion, which need a separate thread.(adsbygoogle = window.adsbygoogle || []).push({});

(If we addressed them in the QG links thread it would interfere with its bibliography role.)

So I'm copying his post here:

Coin said: ↑So I'm skimming this and I'm trying to understand... they say the de sitter group is SO(4,1)/L, where "L" is the lorentz group?

I'm getting kind of curious exactly which models there are that try to deny poincare invariance or replace it with something different. Ones I can think of include:

- This De Sitter Relativity thing ( SO(4,1)/Lorentz )

- LQG ( SO(3,1), which is the "restricted lorentz subgroup"? or just the lorentz subgroup? or does LQG assert poincare invariance as well as SO(3,1)? )

- Lisi's E8 theory ( SO(3,1) )

Anything else? Do doubly-special relativity or MOND imply any specific spacetime symmetry? Is doubly-special relativity related to this de sitter relativity in any way? (The de sitter relativity paper seems to be using some buzzwords similar to doubly-special relativity near the beginning, but maybe I am imagining this...)

I'm kinda confused here, so maybe everything I ask above is nonsense. In particular, are SO(3,1) and SO(1,3) the same thing?! I'm finding a couple of places using the two interchangeably :O

But basically I am curious whether there are any commonalities between all of these models which reject the poincare group (besides of course the detail that they reject the poincare group...)

Actually I am only just now noticing this thread, perhaps I should read this?

**Physics Forums - The Fusion of Science and Community**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# How extensions of relativity apply to quantum gravity (Coin's gambit)

Loading...

Similar Threads for extensions relativity apply | Date |
---|---|

I What false hints of new physics were most notable? | Apr 15, 2018 |

I Left Right Symmetric Extension of SM and vMSM | Mar 9, 2017 |

I Evaluation of SMASH - most minimal extension of SM | Oct 27, 2016 |

Status of the Complex Singlet Extensions? | Aug 7, 2012 |

Summer school on Lorentz violating standard model extensions | Jun 6, 2012 |

**Physics Forums - The Fusion of Science and Community**