Skip to main content

Reset your password

Please enter the e-mail address you used to register to reset your password

Note: The verification e-mail to change your password should arrive immediately. However, in some cases it takes longer. Don't forget to check your spam folder.

If you haven't received the e-mail in 24 hours, please contact customerservices@ioppublishing.org

Registration complete

Thank you for registering with Physics World
If you'd like to change your details at any time, please visit My account

Close
Particles and interactions

Particles and interactions

Changes spotted in fundamental constant

02 Sep 2010 Hamish Johnston
The southern sky over the VLT
Billions of years ago the strength of the electromagnetic interaction was different at opposite ends

You’ve reached the limit of what you can view on Physics World without registering

If you already have an account on Physics World, then please sign in to continue reading

If you do not yet have an account, please register so you can

  • Access more than 20 years of online content
  • Choose which e-mail newsletters you would like to receive
Hamish Johnston is an online editor of Physics World
Read previous

The Sun's magnetic field warps its environment
Read next

Graphene transistor beats speed records

Discover more from Physics World

Related jobs

Related events

Copyright © 2025 by IOP Publishing Ltd and individual contributors