Nonlinear phase shift from photon-photon scattering in vacuum

We show that QED nonlinear effects imply a phase correction to the linear evolution of electromagnetic waves in vacuum. We provide explicit solutions of the modified Maxwell's equations for the propagation of a superposition of two plane waves, and calculate analytically and numerically the corresponding phase shift. This provides a new framework for the search of all-optical signatures of photon-photon scattering in vacuum. In particular, we propose an experiment for measuring the phase shift in projected high-power laser facilities.Comment: 4 pages, 1 figure. Some references were added, and the comparison with AC Kerr effect has been improve

Eleanor P. Wheeler Correspondence

Entries include a typed letter of introduction concerning the Maine Author Collection to a New York City author and summer resident of North Brooklin, Maine, a typed letter from Wheeler on plain paper describing her Maine summer home and resident kittens as represented in her books Tory House Mystery and Jemmie, a typed letter on speckled paper stationery with a research question concerning offbeat histories, secret boasts, and unknown trophies of Maine as structure for a new mystery book, and a typed letter from the Maine State Library on referring her question to the research librarian

Joseph P. Tracy Correspondence

Entry is the typed biography of an airplane pilot raised in Mount Desert Ferry, Maine, assigned as editor to Flying Safety magazine, the Far East Forces Flyer magazine, renamed the Pacific Air Forces (PACAF) Flyer, prior to Missile Safety publications, concerning his book about Alaskan coastal passage Low Man on a Gill-Netter for the Maine Author Collection

UMA COVID-19_News_Directive from Chancellor Malloy_March 10, 2020

Screenshot of University of Maine at Augusta\u27s news webpage with a communication from Chancellor Dannel Malloy regarding the collective actions undertaken by the University of Maine System to prepare for COVID-19

Agnes P. Mantor Correspondence

Entries include a handwritten letter on Farmington State Normal School stationery