I didn’t know that was the mainstream position. Here are two links that I found from your input phrases. I don't think there is a description of a unifying particle yet, but obviously there is a big effort going on trying to get there. If they could isolate the elementary unifying particle that everything else is composed of then the rest would unfold quickly.

http://prola.aps.org/abstract/PRD/v68/i8/e084005
Quantum corrections to the Schwarzschild and Kerr metrics
N. E. J. Bjerrum-Bohr
University of Copenhagen, The Niels Bohr Institute, Blegdamsvej 17, Copenhagen Ø, DK-2100, Denmark
John F. Donoghue
Department of Physics, University of Massachusetts, Amherst, Massachusetts01003, USA
Barry R. Holstein
Department of Physics, University of Massachusetts, Amherst, Massachusetts01003, USA
Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany
Received 18 November 2002; published 17 October 2003

We examine the corrections to the lowest order gravitational interactions of massive particles arising from gravitational radiative corrections. We show how the masslessness of the graviton and the gravitational self-interactions imply the presence of nonanalytic pieces ∼sqrt[-q2],∼q2ln-q2, etc., in the form factors of the energy-momentum tensor and that these correspond to long range modifications of the metric tensor gμν of the form G2m2/r2,G2mħ/r3, etc. The former coincide with well known solutions from classical general relativity, while the latter represent new quantum mechanical effects, whose strength and form is necessitated by the low energy quantum nature of the general relativity. We use these results to define a running gravitational charge.

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TVN-486T3KT-95&_user=10&_coverDate=01%2F15%2F1981&_rdoc=1&_fmt =&_orig=search&_sort=d&view=c&_acct=C000050221&_ve rsion=1&_urlVersion=0&_userid=10&md5=ed5be87fd22d1 c785f3104efb2431e2f

Quantum vacuum energy and the masslessness of the photon
P. C. W. Davies and S. D. Unwin
School of Physics, University of Newcastle upon Tyne, UK
Received 29 October 1980. Available online 24 March 2003.

Abstract
We show that the existence of an arbitrarily small photon mass would produce an additional vacuum energy at the surface of a conducting material that should be measurable. The result could have implications for cosmology.