000145410 001__ 145410 000145410 005__ 20241024135331.0 000145410 0247_ $$2doi$$a10.1103/PhysRevD.110.063035 000145410 0248_ $$2sideral$$a140275 000145410 037__ $$aART-2024-140275 000145410 041__ $$aeng 000145410 100__ $$0(orcid)0000-0003-2264-2306$$aCarmona, J. M.$$uUniversidad de Zaragoza 000145410 245__ $$aApproaches to photon absorption in a Lorentz invariance violation scenario 000145410 260__ $$c2024 000145410 5060_ $$aAccess copy available to the general public$$fUnrestricted 000145410 5203_ $$aVery high-energy astrophysical gamma rays suffer a suppression of their flux along their propagation due to their interaction, through the γγ→e+e− pair-production process, with the soft photon backgrounds present in the Universe. We examine the Universe’s transparency to gamma rays within a Lorentz invariance violation (LIV) framework, focusing on photon subluminal quadratic corrections driven by a high-energy scale. Based on an explicit calculation, we provide a new expression for the cross section that overcomes the limitations of previous approaches and refines existing constraints for the LIV scale, while we introduce a new approximation that may be useful in LIV scenarios beyond effective field theory. These improvements appear essential for setting constraints on LIV effects with future observations at ultrahigh energies, where previous approximations may fall short. 000145410 536__ $$9info:eu-repo/grantAgreement/ES/AEI/PRE2019-089024$$9info:eu-repo/grantAgreement/ES/DGA/E21-23R$$9info:eu-repo/grantAgreement/ES/MICINN/PGC2022-126078NB-C21 000145410 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/ 000145410 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000145410 700__ $$0(orcid)0000-0002-8282-3435$$aCortés, J. L.$$uUniversidad de Zaragoza 000145410 700__ $$aRescic, F. 000145410 700__ $$0(orcid)0000-0003-1357-4815$$aReyes, M. A.$$uUniversidad de Zaragoza 000145410 700__ $$aTerzic, T. 000145410 700__ $$aVrban, F. I. 000145410 7102_ $$12004$$2405$$aUniversidad de Zaragoza$$bDpto. Física Teórica$$cÁrea Física Teórica 000145410 7102_ $$12004$$2390$$aUniversidad de Zaragoza$$bDpto. Física Teórica$$cÁrea Física Atóm.Molec.y Nucl. 000145410 773__ $$g110, 6 (2024), 063035 [13 pp.]$$pPhys. rev. D$$tPhysical Review D$$x2470-0010 000145410 8564_ $$s882300$$uhttps://zaguan.unizar.es/record/145410/files/texto_completo.pdf$$yVersión publicada 000145410 8564_ $$s2819887$$uhttps://zaguan.unizar.es/record/145410/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000145410 909CO $$ooai:zaguan.unizar.es:145410$$particulos$$pdriver 000145410 951__ $$a2024-10-24-12:12:26 000145410 980__ $$aARTICLE