An approach to the cosmological constant problem(s)
نویسندگان
چکیده
منابع مشابه
Solutions to the cosmological constant problems
We critically review several recent approaches to solving the two cosmological constant problems. The ‘‘old’’ problem is the discrepancy between the observed value of rL and the large values suggested by particle physics models. The second problem is the ‘‘time coincidence’’ between the epoch of galaxy formation tG and the epoch of L domination tL . It is conceivable that the ‘‘old’’ problem ca...
متن کاملAxiomatic approach to the cosmological constant
A theory of the cosmological constant Λ is currently out of reach. Still, one can start from a set of axioms that describe the most desirable properties a cosmological constant should have. This can be seen in certain analogy to the Khinchin axioms in information theory, which fix the most desirable properties an information measure should have and that ultimately lead to the Shannon entropy as...
متن کاملAn Issue to the Cosmological Constant Problem
The status of the cosmological constant Λ has long been discussed, whereas it is clearly established in General Relativity (GR) as universal constant. Therefore, similarly to Newton constant of gravitation G, its value has to be estimated from observations. However, such an estimate does not agree by hundred orders of magnitude with its expected value as obtained from quantum field theories by ...
متن کاملAn adjustable Cosmological Constant
Jihn E. Kim Department of Physics and Astronomy and Center for Theoretical Physics, Seoul National University, Seoul 151-747, Korea DOI: http://dx.doi.org/10.3204/DESY-PROC-2010-03/kim jihn After showing the axion couplings, I review the Hawking type solution of the cosmological constant problem, present a (probably) correct way to calculate the probability amplitude, and show that the Kim-Kyae...
متن کاملGravity in the dynamical approach to the cosmological constant
One of the most disturbing difficulties in thinking about the cosmological constant is that it is not stable under radiative corrections. The feedback mechanism proposed in ref. [1] is a dynamical way to protect a zero or small cosmological constant against radiative corrections. Hence, while this by itself does not solve the cosmological constant problem, it can help solving the problem. In th...
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: Physics Letters B
سال: 2005
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2004.12.078