We study behavior of bulk gauge field in the bigravity model in which two positive tension AdS4 branes in AdS5 bulk are included. We solve the equations of motions for Kaluza-Klein modes and determine the mass spectrum. It is shown that unlike the case of graviton, we find no ultralight Kaluza-Klein modes in the spectrum. E-mail:[email protected] JSPS Research Fellow on leave from Yukawa Instit...

A bstract We explore the cosmology and phenomenology of millicharged millicharge-like dark matter with masses from 1 eV to 10 keV charges − 18 14 . Dark in this mass range cannot be thermally produced, but can arise non-thermal mechanisms. propose a concrete model employing spontaneously broken approximate global symmetry, which is produced via misalignment mechanism. show that production mecha...