Abstract
A formula in terms of the exponential map is derived, which reveals for any observer in an arbitrary pseudo-Riemannian space-time the apparent diameter (i.e., the angular diameter) of any distant object. The formula shows immediately the existence of the effect of apparent distortion of the objects. It is proved that this distortion is absent if and only if the space-time is conformally flat.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
