Abstract
This paper analyzes the effective field theory perspective on modern physics through the lens of the quantum theory of gravitational interaction. The historical part argues that the search for a theory of quantum gravity stimulated the change in outlook that characterizes the modern approach to the standard model of particle physics and general relativity. We present some landmarks covering a long period, i.e., from the beginning of the 1930s until 1994, when, according to Steven Weinberg, the modern bottom–up approach to general relativity began. Starting from the first attempt to apply the quantum field theory techniques to quantize Einstein’s theory perturbatively, we explore its developments and interaction with the top–down approach encoded by string theory. In the last part of the paper, we focus on this last approach to describe the relationship between our modern understanding of string theory and effective field theory in today’s panorama. To this end, the non-historical part briefly explains the modern concepts of moduli stabilization and Swampland to understand another change in focus that explains the present framework where some string theorists move.
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Notes
Their analysis stimulated the discussion about the contraposition between reductionism and anti-reductionism points of view.
As we specify in the following, the QG research played an important role in understanding how to quantize non-abelian field theories.
Rosenfeld would become an opponent to the idea of a quantized gravitational interaction only after the end of the 1950s.
The graviton would be identified with a spin-two particle in the following years by Paul Fierz and Wolfgang Pauli [67].
Besides Schwinger’s techniques, in those years, Richard Feynman’s, Ichiro Tomonaga’s, and Freeman Dyson’s contributions also emerged. Schwinger was invited to the Solvay conference but cannot attend the meeting.
At the lowest order in perturbation theory, the electromagnetic ghosts decouple entirely, and the gravitational ghosts are not needed in the one-graviton exchange graphs considered by DeWitt.
The discussions between Feynman and DeWitt stimulated DeWitt’s development of the quantization of both GR and non-Abelian gauge theories. The latter are the building blocks of the SM, which describes the non-gravitational fundamental interactions, i.e., the electroweak and the strong forces.
The situation is different from QED, where only terms occur with a form already present in the Maxwell Lagrangian
Fock discussed Bronstein’s PhD’s work.
For more on this, see [10]. Other historical material can be found on the website http://theor.jinr.ru/ of the Bogoliubov Laboratory of Theoretical Physics. The Memorial Web Pages contain a description of Ogievetsky’s scientific work and some recollections of his colleagues.
See also [42, p. 710].
Salam had already written the papers that would earn him the Nobel Prize 10 years later.
According to Duff, the motivation already appeared in an internal ICTP report dated 1973 [35, p. 2].
Sardelis performed an analysis similar to Duff’s work for the Reissner–Nordström solution, which describes the space-time metric of a charged massive particle in GR.
The covariant approach is the research program initiated by Rosenfeld and developed by Gupta and Feynman.
He explicitly declared to ignore the possibility of a cosmological constant.
The two authors did not quote Feynman’s and DeWitt’s contributions we described in Sect. 2.4.
Sakharov was awarded the Nobel Peace Prize in 1975 “for his struggle for human rights in the Soviet Union, for disarmament and cooperation between all nations” (www.nobelprize.org).
In his analysis of the origin of the EFT approach in the work of Kenneth Wilson, Rivat pointed out that Sakharov’s paper “would deserve special scrutiny” [71, p. 321]
Georgi’s work started before the birth of Quantum Chromodynamics.
According to the authors: “we conjecture that the ghost difficulty could be avoided and the unitarity restored if the parameters of the theory approach a UV (necessarily non-Gaussian) fixed point [...] Of course it is not easy to calculate non-Gaussian fixed points” [57, p. 151].
Adler presented his point of view at the second Shelter Island conference, as described in Schweber [83].
Superstring theory incorporates supersymmetry, which permits the inclusion of fermionic particles in the spectrum of the theory to obtain a theory of everything.
See also Sect. 4 for further comments connected with the present status of research in ST.
How ST incorporates Einstein’s theory is discussed in Sect. 4.
The nonperturbative pseudo-solutions, which produce the so-called ghosts, are the source of the sicknesses of higher derivative theories.
This event is sometimes called first string revolution.
Iwasaki’s work was known to Gupta and his collaborator Stanley Radford who investigated the gravitational two-particle potential at the end of 1970s to clarify how it can be derived from the scattering operator by using the techniques of the standard QFT.
This principle states that theories of science that are applicable in vastly different length scales can be sufficiently independent from each other such that lack of knowledge of the more microscopic theories does not forbid progress of the theories at larger length scales. In other words, chemistry can be done without solving the puzzles of the Standard Model of Particle Physics. The decoupling theorem dates back to 1975 with the work of Thomas Appelquist and James Carazzone [4].
Follow the link to the recorded lectures on https://www.mpiwg-berlin.mpg.de/event/history-physics.
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Acknowledgements
The authors thank John Donoghue and Kurt Lechner for sharing their reminiscences and the three anonymous referees for helping improve the original manuscript. A.R. is also grateful to Lechner for the discussions that helped clarify some mathematical details and to Ksenia Dobriakova for an Italian translation of Sakharov’s work.
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Appendix: Chronologies
Appendix: Chronologies
This appendix contains the events analyzed in the paper in chronological order. We did not create a unique timeline. We decided to keep the different sections separate for clarity.
1.1 The roots of the modern EFT of quantum GR
1.1.1 The analogy between electrodynamics and gravity
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1930
Rosenfeld applies the perturbative methods to quantum GR
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1936
Bronstein obtains the Newton potential as a one-graviton exchange
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1948
Solvay Physics Council: Oppenheimer comments on Rosenfeld’s work
1.1.2 Jablonna’s conference
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1950
DeWitt’s unpublished Ph.D. thesis.
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1952
Gupta reperforms and publishes DeWitt’s calculation.
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1955
Feynman starts his investigations on quantum GR
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1962
DeWitt and Utiyama’s paper shows the emergence of higher derivative terms in the context of quantum GR following Feynman’s unpublished investigations
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1962
Jablonna Conference. Ghosts and higher derivative terms are discussed. DeWitt suggests investigating the radiative corrections to Schwarzshild solution
1.1.3 The first quantum corrections to Newton’s potential
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1962
Halpern reintroduces gravitational interaction in scattering processes
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1965
Weinberg, Ogievetsky, and Polubarinov discuss the nonlinear effects of the spin-two field.
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1969
Delbourgo started his investigations on quantum GR
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1971
Iwasaki’s bottom–up approach to Mercury’s perihelion
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1973
Duff applies new renormalization techniques to Schwarzschild’s solution
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1973
Sardelis follows Duff and investigates Reissner-Nordström solution
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1973
“Quantum Gravity. An Oxford Symposium”
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1974
Duff calculates the quantum corrections to Newton’s potential by analyzing Schwarzschild’s solution
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1974
’t Hooft and Veltman prove non-finiteness of quantum GR coupled with matter at one loop
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1975
Berends and Gastman investigate quantum gravity corrections at the one-loop level to the electron and muon (g-2)/2
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1986
Goroff and Sagnotti prove non-finiteness of pure quantum GR at the two-loop level
1.1.4 The role of higher derivative theories
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1918
Weyl publishes his higher derivative theory for gravity without the EH term
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1935
Euler and Kochel introduce the effective theory approach to deal with nonlinearities in QED
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1936
Euler and Heisenberg develop Euler and Kochel’s work
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1947
Gregory reintroduces the EH term in higher derivative theories
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1954
Schwinger introduces the concept of effective action
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1966
Pechlaner and Sechsel apply the concept of effective Lagrangian merging the frameworks of higher derivative theories and particle physics
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1967
Sakharov treats the EH term as the zeroth approximation of an effective quantum action
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1975
At Oxford’s symposium, Deser suggests the connection between nonrenormalizability and GR as an effective theory
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1977
Stelle discusses the renormalizability of higher derivative theories
1.2 Entering the modern era
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1973
Discovery of asymptotic freedom
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1974
Firsts models of Grand Unified Theories
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1974
Georgi, Quinn, and Weinberg discuss the running of coupling constants for strong, electroweak, and gravitational interaction
1.2.1 Weinberg’s role and the change in outlook
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1962
Jablonna Conference. Feynman points out the non-relevance of UV effects for the bottom–up approach
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1975
Oxford Symposium. Salam emphasizes the importance of the bottom–up approach, disregarding UV effects
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1976
Weinberg’s Erice lecture suggests a connection between asymptotic safety and difficulties in quantizing GR. Weinberg tarts challenging the renormalization criterion
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1979
Weinberg’s paper on EFT
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1980
In Einstein Centenary Survey, Weinberg uses the term “effective gravitational Lagrangian.” In his Nobel lecture, he introduces the EFT perspective
1.2.2 Toward the modern bottom–up approach
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1970
Zumino uses the massive EH action to describe spin 2 particles in the context of strong forces
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1982
Adler develops Sakharov’s work and discusses the gravitational effective action
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1983
Shelter Island II. Adler presents his EFT point of view
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1984
Nepomechie points out the analogy between strong and gravitational interactions from the EFT perspective
-
1987
Goity shows that in the context of strong interaction, loop effects are independent of chiral parameters
1.2.3 Completing the puzzle: Strings versus QFT
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1984
Green and Schwarz publish the exaptation paper that marks the first string revolution
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1986
De Alwis uses Wilson’s renormalization techniques to show gravity and its higher derivative terms emerge as an effective action in String Theory
-
1991
Simon discusses de Alwis’s result as a top–down perspective
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1987
Amati, Ciafaloni, and Veneziano develop the top–down strategy starting the investigation of infra-red effects
-
1990
Iengo and Lechner analyze the classical and quantum one-loop corrections to the Newton potential, comparing top–down and bottom–up strategies
-
1993
Donoghue performs his bottom–up calculation
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1994
Donoghue publishes the bottom–up classical and quantum one-loop corrections to Newton’s potential. He computes the coefficients and proposes a new research area that regularly applies EFT tools to quantum GR.
1.3 Strings and EFT: today
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1975
Appelquist and Carazzone publish the decoupling theorem
-
1985
Dine and Seiberg formulate the so-called Dine-Seiberg problem
-
2000
Bousso and Polchinski discuss the emerging Landscape scenario
-
2005
To solve the problems connected with the Landscape, Vafa proposes a shift in focus and the Swampland scenario
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2006
Woit publishes his critics to String Theory in Not even wrong
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2007
Arkani-Hamed and his collaborators discuss the Weak Gravity Conjecture
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2019
Ooguri and his collaborators introduce the de Sitter conjecture; Lj̈ust and his collaborators discuss the AdS distance conjecture
-
2023
Montero and his collaborators discuss the empirical consequences of the AdS distance conjecture
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Rocci, A., Van Riet, T. The quantum theory of gravitation, effective field theories, and strings: yesterday and today. EPJ H 49, 7 (2024). https://doi.org/10.1140/epjh/s13129-024-00069-4
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DOI: https://doi.org/10.1140/epjh/s13129-024-00069-4