کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1771375 | 1020757 | 2008 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Constraints on temporal variation of fundamental constants from GRBs
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
نجوم و فیزیک نجومی
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چکیده انگلیسی
The formation of a strange or hybrid star from a neutron star progenitor is believed to occur when the central stellar density exceeds a critical value. If the transition from hadron to quark matter is of first order, the event has to release a huge amount of energy in a very short time, and we would be able to observe the phenomenon even if it is at cosmological distance far from us. Most likely, such violent quark deconfinement would be associated with at least a fraction of the observed gamma ray bursts. If we allow for temporal variations of fundamental constants like ÎQCD or GN, we can expect that neutron stars with an initial central density just below the critical value can enter into the region where strange or hybrid stars are the true ground state. From the observed rate of long gamma ray bursts, we are able to deduce the constraint GËN/GNâ²10-17yr-1, which is about 5 orders of magnitude more stringent than the strongest previous bounds on a possible increasing GN.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Astroparticle Physics - Volume 29, Issue 3, April 2008, Pages 223-227
Journal: Astroparticle Physics - Volume 29, Issue 3, April 2008, Pages 223-227
نویسندگان
C. Bambi, A. Drago,