Everything you always wanted to know about the cosmological constant problem (but were afraid to ask)

  title={Everything you always wanted to know about the cosmological constant problem (but were afraid to ask)},
  author={J{\'e}r{\^o}me Martin},
  journal={Comptes Rendus Physique},

Scrutinizing the cosmological constant problem and a possible resolution

We suggest a new perspective on the Cosmological Constant Problem by scrutinizing its standard formulation. In classical and quantum mechanics without gravity, there is no definition of the zero

About the Measure of the Bare Cosmological Constant

I try to revive, and possibly reconcile, a debate started a few years ago, about the relative roles of a bare cosmological constant and of a vacuum energy, by taking the attitude to try to get the

Cosmological constant and vacuum energy: old and new ideas

The cosmological constant (CC) term in Einstein's equations, Λ, was first associated to the idea of vacuum energy density. Notwithstanding, it is well-known that there is a huge, in fact appalling,

Can compactifications solve the cosmological constant problem?

Recently, there have been claims in the literature that the cosmological constant problem can be dynamically solved by specific compactifications of gravity from higher-dimensional toy models. These

The Cosmological Constant Problem and Running Vacuum in the Expanding Universe

. It is well-known that quantum field theory (QFT) induces a huge value of the cosmological constant, Λ, which is outrageously inconsistent with cosmological observations. We review here some aspects

Can the fluctuations of the quantum vacuum solve the cosmological constant problem?

The cosmological constant problem arises because the magnitude of vacuum energy density predicted by quantum mechanics is about 120 orders of magnitude larger than the value implied by cosmological

Renormalizing the vacuum energy in cosmological spacetime: implications for the cosmological constant problem

The renormalization of the vacuum energy in quantum field theory (QFT) is usually plagued with theoretical conundrums related not only with the renormalization procedure itself, but also with the

A Non-perturbative Hamiltonian Approach to the Cosmological Constant Problem

It was recently suggested that the cosmological constant problem as viewed in a non-perturbative framework is intimately connected to the choice of time and a physical Hamiltonian. We develop this

Finite temperature contributions to cosmological constant

  • I. Park
  • Physics
    International Journal of Modern Physics A
  • 2022
We reexamine the cosmological constant problem in a finite temperature setup and propose an intriguing possibility of carrying out perturbative analysis by employing a renormalization scheme in which

Problems of the Standard Model and their relations to Planck/String scale physics

Since the discovery of the Higgs boson [1, 2], we are now living in an exciting era: We already know all the Standard Model (SM) particles and their couplings ! In particular, the observed quartic



On the trace-free Einstein equations as a viable alternative to general relativity

The quantum field theoretical prediction for the vacuum energy density leads to a value for the effective cosmological constant that is incorrect by between 60 and 120 orders of magnitude. We review

Phenomenology of gravitational aether as a solution to the old cosmological constant problem

One of the deepest and most long-standing mysteries in physics has been the huge discrepancy between the observed vacuum density and our expectations from theories of high energy physics, which has

Dynamics of dark energy

We review in detail a number of approaches that have been adopted to try and explain the remarkable observation of our accelerating universe. In particular we discuss the arguments for and recent

Inflationary Perturbations: the Cosmological Schwinger Effect

This pedagogical review aims at presenting the fundamental aspects of the theory of inflationary cosmological perturbations of quantum-mechanical origin. The analogy with the well-known Schwinger

Inflationary Cosmological Perturbations of Quantum-Mechanical Origin

This review article aims at presenting the theory of inflation. We first describe the background spacetime behavior during the slow-roll phase and analyze how inflation ends and the Universe reheats.

The Case for a positive cosmological Lambda term

Recent observations of Type 1a supernovae indicating an accelerating universe have once more drawn attention to the possible existence, at the present epoch, of a small positive Lambda-term