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Universality of ult...
Universality of ultra-relativistic gravitational scattering
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- Di Vecchia, Paolo (author)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Univ Copenhagen, Niels Bohr Inst, Blegdamsvej 17, DK-2100 Copenhagen, Denmark.;Stockholm Univ, KTH Royal Inst Technol, NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.,Nordiska institutet för teoretisk fysik (Nordita),University of Copenhagen, Denmark
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- Heissenberg, Carlo (author)
- Uppsala universitet,Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Uppsala University, Sweden,Nordita SU, Stockholm Univ, ;Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden.,Teoretisk fysik,Stockholm Univ, KTH Royal Inst Technol, NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.
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- Russo, Rodolfo (author)
- Queen Mary Univ London, Sch Phys & Astron, Ctr Res String Theory, Mile End Rd, London E1 4NS, England.
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- Veneziano, Gabriele (author)
- CERN, Theory Dept, CH-1211 Geneva 23, Switzerland.;Coll France, 11 Pl M Berthelot, F-75005 Paris, France.
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(creator_code:org_t)
- Elsevier BV, 2020
- 2020
- English.
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In: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 811
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Abstract
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- We discuss the ultra-relativistic gravitational scattering of two massive particles at two-loop (3PM) level. We find that in this limit the real part of the eikonal, determining the deflection angle, is universal for gravitational theories in the two derivative approximation. This means that, regardless of the number of supersymmetries or the nature of the probes, the result connects smoothly with the massless case discussed since the late eighties by Amati, Ciafaloni and Veneziano. We analyse the problem both by using the analyticity and crossing properties of the scattering amplitudes and, in the case of the maximally supersymmetric theory, by explicit evaluation of the 4-point 2-loop amplitude using the results for the integrals in the full soft region. The first approach shows that the observable we are interested in is determined by the inelastic tree-level amplitude describing the emission of a graviton in the high-energy double-Regge limit, which is the origin of the universality property mentioned above. The second approach strongly suggests that the inclusion of the whole soft region is a necessary (and possibly sufficient) ingredient for recovering ultra relativistic finiteness and universality at the 3PM level. We conjecture that this universality persists at all orders in the PM expansion.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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