scholarly journals Quantum Fields on the de Sitter Expanding Universe

10.5772/36375 ◽  
2012 ◽  
Author(s):  
Ion I.
2021 ◽  
Vol 103 (4) ◽  
Author(s):  
E. T. Akhmedov ◽  
A. A. Artemev ◽  
I. V. Kochergin

1969 ◽  
Vol 64 (3) ◽  
pp. 669-714 ◽  
Author(s):  
G. Börner ◽  
H. P. Dürr

1999 ◽  
Vol 16 (12) ◽  
pp. 3923-3935 ◽  
Author(s):  
F Finelli ◽  
A Gruppuso ◽  
G Venturi

2014 ◽  
Vol 23 (01) ◽  
pp. 1430001 ◽  
Author(s):  
E. T. AKHMEDOV

We discuss peculiarities of quantum fields in de Sitter (dS) space on the example of the self-interacting massive real scalar, minimally coupled to the gravity background. Nonconformal quantum field theories (QFTs) in dS space show very special infrared behavior, which is not shared by quantum fields neither in flat nor in anti-dS space: in dS space loops are not suppressed in comparison with tree level contributions because there are strong infrared corrections. That is true even for massive fields. Our main concern is the interrelation between these infrared effects, the invariance of the QFT under the dS isometry and the (in)stability of dS invariant states (and of dS space itself) under nonsymmetric perturbations.


2021 ◽  
pp. 2150162
Author(s):  
Ion I. Cotăescu

We derive for the first time the form of the spiral null geodesics around the photon sphere of the Reissner–Nordstrom black hole in the de Sitter expanding universe. Moreover, we obtain the principal parameter we need for deriving, according to our method [I. I. Cotăescu, Eur. Phys. J. C 81, 32 (2021)], the black hole shadow and the related redshift as measured by a remote observer situated in the asymptotic zone. We obtain thus a criterion of detecting charged black holes without peculiar velocities when one knows the mass, redshift and the black hole shadow.


Author(s):  
Viatcheslav Mukhanov ◽  
Sergei Winitzki

Sign in / Sign up

Export Citation Format

Share Document