The Gibbons-Hawking effect is the statement that a temperature can be associated to each solution of the Einstein field equations that contains a causal horizon. It is named after Gary Gibbons and Stephen William Hawking.
Schwarzschild spacetime contains an event horizon and so can be associated with temperature. In the case of Schwarzschild spacetime this is the temperature T of a blackhole of mass M, satisfying T/M.
De Sitter space which contains an event horizon has the temperature T proportional to the Hubble parameter H. We consider here the influence of the heat bath of the Gibbons-Hawking photons on the energy shift of H-atom electrons.
The considered problem is not in the scientific isolation, because some analogical problems are solved in the scientific respected journals. At present time it is a general conviction that there is an important analogy between black hole and the hydrogen atom. The similarity between black hole and the hydrogen atom was considered for instance by Corda  , who discussed the precise model of Hawking radiation from the tunnelling mechanism. In this article an elegant expression of the probability of emission is given in terms of the black hole quantum levels. So, the system composed of Hawking radiation and black hole quasi-normal modes introduced by Corda  is somewhat similar to the semiclassical Bohr model of the structure of a hydrogen atom.
The time dependent Schrödinger equation was derived for the system composed by Hawking radiation and black hole quasi-normal modes  . In this model, the physical state and the correspondent wave function are written in terms of a unitary evolution matrix instead of a density matrix. Thus, the final state is a pure quantum state instead of a mixed one and it means that there is no information loss. Black hole can be well defined as the quantum mechanical systems, having ordered, discrete quantum spectra, which respect ’t Hooft’s assumption that Schrödinger equations can be used universally for all dynamics in the universe.
Thermal photons by Gibbons and Hawking form so called blackbody, which has the distribution law of photons derived in 1900 by Planck  -  . The derivation was based on the investigation of the statistics of the system of oscillators inside of the blackbody. Later Einstein  derived the Planck formula from the Bohr model of atom where electrons have the discrete energies and the energy of the emitted photons which are given by the Bohr formula ħω =, where are the initial and final energies of electrons.
Now, let us calculate the modified Coulomb potential due to blackbody. The starting point of the determination of the energy shift in the H-atom is the potential, which is generated by nucleus of the H-atom. The potential at point, evidently is   :
If we average the last equation in space, we can eliminate so called the effective potential in the form
where is the average value of the square coordinate shift caused by the thermal photon fluctuations. The potential shift follows from Equation (2):
The corresponding shift of the energy levels is given by the standard quantum mechanical formula 
In case of the Coulomb potential, which is the case of the H-atom, we have
Then for the H-atom we can write
where we used the following equation for the Coulomb potential
Motion of an electron in electric field is evidently described by elementary equation
which can be transformed by the Fourier transformation into the following equation
where the index ω concerns the Fourier component of above functions.
On the basis of the Bethe idea of the influence of vacuum fluctuations on the energy shift of electron  , the following elementary relations were used by Welton  and Akhiezer  and Berestetzkii et al.  :
and in case of the thermal bath of the blackbody, the last equation is of the following form  :
because the Planck law in (11) was written as
where the term
is the average energy of photons in the blackbody and
is the number of electromagnetic modes in the interval ω, ω + dω.
where involves the number of frequencies in the interval (ω, ω + dω).
So, after some integration, we get
where F(ω) is the primitive function of the omega-integral
which cannot be calculated by the elementary integral methods and it is not involved in the tables of integrals.
Frequencies and will be determined with regard to the existence of the fluc- tuation field of thermal photons. It was determined in case of the Lamb shift   by means of the physical analysis of the interaction of the Coulombic atom with the surrounding fluctuation field. We suppose here that the Bethe and Welton arguments are valid and so we take the frequencies in the Bethe-Welton form. In other words, electron cannot respond to the fluctuating field if the frequency which is much less than
the atom binding energy given by the Rydberg constant  . So, the
lower frequency limit is
where α ≈ 1/137 is so called the fine structure constant.
The specific form of the second frequency follows from the elementary argument, that we expect the effective cutoff, since we must neglect the relativistic effect in our nonrelativistic theory. So, we write
If we take the thermal function of the form of the geometric series
and the first thermal contribution is thermal contribution
Then, with Equation (6)
Let us only remark that the numerical form of Equation (23) has deep experimental astrophysical meaning.
In article by author  , which is the continuation of author articles on the finite- temperature Čerenkov radiation and gravitational Čerenkov radiation   , the temperature Green function in the framework of the Schwinger source theory was derived in order to determine the Coulomb and Yukawa potentials at finite-temperature using the Green functions of a photon with and without radiative corrections, and then by considering the processes expressed by the Feynman diagrams.
The determination of potential at finite temperature is one of the problems which form the basic ingredients of the quantum field theory (QFT) at finite temperature. This theory was formulated some years ago by Dolan and Jackiw  , Weinberg  and Bernard  in 1974 and some of the first applications of this theory were the calculations of the temperature behavior of the effective potential in the Higgs sector of the standard model.
Information on the systematic examination of the finite temperature effects in quantum electrodynamics (QED) at one-loop order was given by Donoghue, Holstein and Robinett  . Partovi  in 1994 discussed the QED corrections to Planck’s radiation law and photon thermodynamics,
A similar discussion of QED was published by Johansson, Peressutti and Skagerstam  and Cox et al. in 1984  .
Serge Haroche  and his research group in the Paris microwave laboratory used a small cavity for the long life-time of photon quantum experiments performed with the Rydberg atoms. We considered here the thermal gas corresponding to the Gibbons- Hawking theory of space-time (at temperature T) as the preamble for new experiments for the determination of the energy shift of H-atom electrons interacting with the Gibbons-Hawking thermal gas. It is not excluded, that the observations performed by the well educated astro-experts will be the Nobelian ones.
 Corda, Ch. (2015) Quasi-Normal Modes: The “Electrons” of Blak Holes as “Gravitational Atoms”? Implications for the Black Hole Information Puzzle. Advances in High Energy Physics, 2015, Article ID: 867601. http://dx.doi.org/10.1155/2015/867601
 Johansson, A.E., Peressutti, G. and Skagerstam, B.S. (1986) Quantum Field Theory at Finite Temperature: Renormalization and Radiative Corrections. Nuclear Physics B, 278, 324-342.
 Cox, P.H., Hellman, W.S. and Yildiz, A. (1984) Finite Temperature Corrections to Field Theory: Electron Mass, Magnetic Moment, and Vacuum Energy. Annals of Physics, 154, 211-228.