Entropy production in a lepton-photon universe
نویسندگان
چکیده
منابع مشابه
Baryogenesis from a Lepton Asymmetric Universe
We demonstrate that CP−violation in the Majorana mass matrices of the heavy neutrinos can generate a CP−asymmetric universe. The subsequent decay of the Majorana particles generates a lepton number asymmetry. During the electroweak phase transition the lepton asymmetry is converted into a baryon asymmetry, which survives down to this time. 1 On sabbatical leave from Theory Group, Physical Resea...
متن کاملLepton asymmetry creation in the Early Universe
Oscillations of active to sterile neutrinos with a small mixing angle sin 2θ < 10 −2 could generate a large lepton asymmetry in the Early Universe. The final order of magnitude of the lepton asymmetry η is mainly determined by its growth in the last stage of evolution, the so called power-law regime. There exist two contradictory results in the literature, η ∝ T −1 and η ∝ T −4 , where T is the...
متن کاملLepton Pair Production by a High Energy Photon in a Strong Electromagnetic Eld
Using impact{factor representation, we consider the lepton pair production by an incident high{energy photon in a strong electromagnetic eld of a nucleus. By summing leading terms of perturbation series, we obtain a simple formula for the amplitude, valid to all orders in O(Z) and arbitrary eld of the nucleus. Using these results, we derive, in a simple manner, the results for the lepton pair p...
متن کاملLepton pair production by a high energy photon in a strong electromagnetic field
Using impact–factor representation, we consider the lepton pair production by an incident high–energy photon in a strong electromagnetic field of a nucleus. By summing leading terms of perturbation series, we obtain a simple formula for the amplitude, valid to all orders in O(αZ) and arbitrary field of the nucleus. Using these results, we derive, in a simple manner, the results for the lepton p...
متن کاملA Perspective on Lepton-photon Physics
WOLFGANG K. H. PANOFSKY Stanford Linear Accelerator Center Stanford University, Stanford, California 94309 ABSTRACT This paper reviews some key experiment,s of the past in which the same basic physical processes are attacked both through lepton-photon interactions and by using hadron machines as primary tools. Not surprisingly, it is conrludeh that the basic distinction between lepion-photon ph...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astrophysics and Space Science
سال: 2017
ISSN: 0004-640X,1572-946X
DOI: 10.1007/s10509-017-3023-1