Results 41 to 50 of about 1,881,508 (108)
Renormalization group flow of f(R)-gravity [PDF]
, 2008 We use the functional renormalization group equation for quantum gravity to construct a non-perturbative flow equation for modified gravity theories of the form $S = \int d^dx \sqrt{g} f(R)$.
Afd Theoretical Physics (ITF) +4 more
core
A new class of group field theories for 1st order discrete quantum gravity [PDF]
, 2008 Group Field Theories, a generalization of matrix models for 2d gravity, represent a 2nd quantization of both loop quantum gravity and simplicial quantum gravity.
Afd Theoretical Physics (ITF) +3 more
core
Is Gravity an Entropic Force? [PDF]
, 2011 The remarkable connections between gravity and thermodynamics seem to imply that gravity is not fundamental but emergent, and in particular, as Verlinde suggested, gravity is probably an entropic force.
Shan, Gao, Shan Gao
core +1 more source
, 2013 The recent observational data in cosmology seem to indicate that the universe is currently expanding in an accelerated way. An intriguing interpretation of these data is that they may just be signalling that Einstein's General Relativity is not the correct description of gravity when we consider distances of the order of the present horizon of the ...
openaire +2 more sources
Dark energy and modified gravity [PDF]
, 2010 Explanations of the late-time cosmic acceleration within the framework of general relativity are plagued by difficulties. General relativistic models are mostly based on a dark energy field with fine-tuned, unnatural properties. There is a great variety of models, but all share one feature in common -- an inability to account for the gravitational ...
Durrer, Ruth, Maartens, Roy
openaire +4 more sources
International trade without CES : estimating translog gravity [PDF]
, 2012 This paper derives a micro-founded gravity equation based on a translog demand system that allows for flexible substitution patterns across goods. In contrast to the standard CES-based gravity equation, translog gravity generates an endogenous trade cost
Novy, Dennis
core +1 more source
The emergence of spacetime, or, quantum gravity on your desktop [PDF]
, 2008 Is there an approach to quantum gravity which is conceptually simple, relies on very few fundamental physical principles and ingredients, emphasizes geometric (as opposed to algebraic) properties, comes with a definite numerical approximation scheme, and
Dep Natuurkunde +2 more
core
CMB-Galaxy cross-correlation as a cosmological test of modfied gravity [PDF]
, 2022 we explore the power of future cosmological survey to probe K- Mouflage models of modified gravity. We compute the expected CMB-galaxy cross correlation in K- Mouflage, showing that upcoming survey will be suited to probe this kind of ...
Benevento, Giampaolo
core
Wave propagation in modified gravity
Physical Review D, 2016 We investigate the propagation of scalar waves induced by matter sources in the context of scalar-tensor theories of gravity which include screening mechanisms for the scalar degree of freedom. The usual approach when studying these theories in the non-linear regime of cosmological perturbations is based on the assumption that scalar waves travel at ...
Lindroos, Jan Ø. +2 more
openaire +2 more sources
Enhanced Simulation of Partial Gravity for Extravehicular Activity [PDF]
, 2013 Prior studies of human locomotion under simulated partial gravity have hypothesized that energy expenditure is increased in lunar gravity, as compared to that of Mars.
Klaus, David M +3 more
core +1 more source