• Register
PhysicsOverflow is a next-generation academic platform for physicists and astronomers, including a community peer review system and a postgraduate-level discussion forum analogous to MathOverflow.

Welcome to PhysicsOverflow! PhysicsOverflow is an open platform for community peer review and graduate-level Physics discussion.

Please help promote PhysicsOverflow ads elsewhere if you like it.


PO is now at the Physics Department of Bielefeld University!

New printer friendly PO pages!

Migration to Bielefeld University was successful!

Please vote for this year's PhysicsOverflow ads!

Please do help out in categorising submissions. Submit a paper to PhysicsOverflow!

... see more

Tools for paper authors

Submit paper
Claim Paper Authorship

Tools for SE users

Search User
Reclaim SE Account
Request Account Merger
Nativise imported posts
Claim post (deleted users)
Import SE post

Users whose questions have been imported from Physics Stack Exchange, Theoretical Physics Stack Exchange, or any other Stack Exchange site are kindly requested to reclaim their account and not to register as a new user.

Public \(\beta\) tools

Report a bug with a feature
Request a new functionality
404 page design
Send feedback


(propose a free ad)

Site Statistics

205 submissions , 163 unreviewed
5,047 questions , 2,200 unanswered
5,345 answers , 22,709 comments
1,470 users with positive rep
816 active unimported users
More ...

  Discovery of anti-deuteron and the implication of CPT violation

+ 1 like - 0 dislike

From [this review by
Antonino Zichichi 2009](http://cerncourier.com/cws/article/cern/38704) and [this review from T. D. Lee in 2007](http://cerncourier.com/cws/article/cern/31867), it is said that Dirac is very upset when hearing the discovery of anti-deuteron (anti-matter of deuteron, the nucleus of [deuterium](https://en.wikipedia.org/wiki/Deuterium), called a deuteron, contains one proton and one neutron) in 11 March 1965.

However, Dirac is famous for prediction of the first anti-matter of electron, the positron. His prediction is based on the invariance of charge C-symmetry. Now we know that the parity P (Lee-Yang 1956) and charge C are both violated, and the CP is violated too.

>question: What is the implication of CPT for the discovery of anti-deuteron? 

>i) Is that CP violating and T-violating but CPT is preserved?

>ii) It is known at least mentioned in the [this review by
Antonino Zichichi 2009](http://cerncourier.com/cws/article/cern/38704) see also [this review](http://cerncourier.com/cws/article/cern/31867)  article that the CPT is violated at the Planck scale, and relativistic QFT does not hold. Does the discovery of anti-deuteron imply anything about CPT violation? 

> iii) Finally, the final comment from the review "This implies that no theory exists that can guarantee that if we have matter then antimatter must exist. This is why the fact that all anti-atoms with their antinuclei must exist with certitude resulted from the experiment at CERN in March 1965." I suppose that it means that the violation of CPT does not guarantee the existence of anti-matter nor the existence of antinuclei. Is this interpretation correct and accepted? So what are the current theory that supports the violation of CPT?

asked Mar 19, 2017 in Open problems by wonderich (1,500 points) [ revision history ]
edited Mar 21, 2017 by wonderich

My impression about the article is that it's rather the non-existence of antideuteron that would be more informative: if antideuteron doesn't exist then CPT must be violated; if it does exist, this proves nearly nothing and disapproves nothing about the violation of CPT. This should answer your i) and ii). For iii) I'm not aware any compelling theory or empirical evidence that would really make CPT violation an appealing idea, but this can be my own ignorance.

Your answer

Please use answers only to (at least partly) answer questions. To comment, discuss, or ask for clarification, leave a comment instead.
To mask links under text, please type your text, highlight it, and click the "link" button. You can then enter your link URL.
Please consult the FAQ for as to how to format your post.
This is the answer box; if you want to write a comment instead, please use the 'add comment' button.
Live preview (may slow down editor)   Preview
Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:
If you are a human please identify the position of the character covered by the symbol $\varnothing$ in the following word:
Then drag the red bullet below over the corresponding character of our banner. When you drop it there, the bullet changes to green (on slow internet connections after a few seconds).
Please complete the anti-spam verification

user contributions licensed under cc by-sa 3.0 with attribution required

Your rights