Vacuum phase transition solves the 
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 tension

Valentino, Eleonora Di; Linder, Eric V.; Melchiorri, A.

doi:10.1103/physrevd.97.043528

Cited by 164 publications

(131 citation statements)

References 79 publications

(94 reference statements)

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“…As we can see, while the current bounds from Planck are rather weak and there is no indication for a scale dependency of the A lens anomaly (see also [33]), the stage-IV experiment can provide constraints at ∼1% level on B lens , providing useful information on a possible scale dependence. As discussed in the previous section, we have considered different pivot scales l Ã .…”

Section: Future Constraints On Angular Scale Dependence Of a Lensmentioning

confidence: 93%

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Cornering the Planck Alens tension with future CMB data

2018

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The precise measurements of cosmic microwave background (CMB) anisotropy angular power spectra made by the Planck satellite show an anomalous value for the lensing amplitude, defined by the parameter A lens , at about 2 standard deviations (2.6 standard deviations when cosmic shear data are included). Moreover, considering A lens brings the values of the cosmological parameters determined by Planck in better agreement with those found by pre-Planck data sets. In this paper, after discussing the current status of the anomaly, we quantify the potential of future CMB measurements in confirming/falsifying the A lens tension. We find that a space-based experiment such as LiteBIRD could falsify the current A lens tension at the level of 5 standard deviations. Similar constraints can be achieved by a stage-III experiment assuming an external prior on the reionization optical depth of τ ¼ 0.055 AE 0.010 as already provided by the Planck satellite. A stage-IV experiment could further test the A lens tension at the level of 10 standard deviations. A comparison between temperature and polarization measurements made at different frequencies could further identify possible systematics responsible for A lens > 1. We show that, in the case of the CMB-S4 experiment, polarization data alone have the potential of falsifying the current A lens anomaly at more than 5 standard deviations and to strongly bound its frequency dependence. We also evaluate the future constraints on a possible scale dependence for A lens .

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Section: Future Constraints On Angular Scale Dependence Of a Lensmentioning

confidence: 93%

“…Such scale dependence could arise from beyond standard model physics such as modified gravity, cold dark energy, or massive neutrinos. We therefore consider the following parametrization (see [33]),…”

Section: Methodsmentioning

confidence: 99%

Cornering the Planck Alens tension with future CMB data

2018

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“…In what follows we therefore let vary also w 0 and w a for a total of 12 cosmological parameters varied at the same time, following the approach used in [10][11][12][13].…”

Section: Methodsmentioning

confidence: 99%

First cosmological constraints combining Planck with the recent gravitational-wave standard siren measurement of the Hubble constant

Valentino

Melchiorri

2018

Phys. Rev. D

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The recent observations of gravitational-wave and electromagnetic emission produced by the merger of the binary neutron-star system GW170817 have opened the possibility of using standard sirens to constrain the value of the Hubble constant. While the reported bound of H 0 ¼ 70 þ12 −8 at 68% C.L. is significantly weaker than those recently derived by observations of Cepheid variables, it does not require any form of cosmic distance ladder and can be considered as complementary and, in principle, more conservative. Here we combine, for the first time, the new measurement with the Planck cosmic microwave background (CMB) observations in a 12 parameter extended ΛCDM scenario, where the Hubble constant is weakly constrained from CMB data alone and bound to a low value H 0 ¼ 55 þ7 −20 km/s/Mpc at 68% C.L. We point out that the non-Gaussian shape of the GW170817 bound makes lower values of the Hubble constant in worse agreement with observations than what is expected from a Gaussian form. The inclusion of the new GW170817 Hubble constant measurement therefore significantly reduces the allowed parameter space, improving the cosmological bounds on several parameters as the neutrino mass, curvature, and dark energy equation of state.

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“…A detailed analysis of results of recent observations shows that there is a tension between local and primordial measurements of cosmological parameters [3]. It appears that this tension may be connected with dark energy evolving in time [4]. This paper is a contribution to the discussion of the nature of the dark energy.…”

Section: Introductionmentioning

confidence: 99%

From Quantum Unstable Systems to the Decaying Dark Energy: Cosmological Implications

Stachowski

Szydłowski

Urbanowski

2018

Advances in High Energy Physics

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We consider a cosmology with decaying metastable dark energy and assume that a decay process of this metastable dark energy is a quantum decay process. Such an assumption implies among others that the evolution of the Universe is irreversible and violates the time reversal symmetry. We show that if we replace the cosmological time appearing in the equation describing the evolution of the Universe by the Hubble cosmological scale time, then we obtain time dependent Λ( ) in the form of the series of even powers of the Hubble parameter : Λ( ) = Λ( ). Our special attention is focused on radioactive-like exponential form of the decay process of the dark energy and on the consequences of this type decay.

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Vacuum phase transition solves the H0 tension

Cited by 164 publications

References 79 publications

Cornering the Planck Alens tension with future CMB data

Cornering the Planck Alens tension with future CMB data

First cosmological constraints combining Planck with the recent gravitational-wave standard siren measurement of the Hubble constant

From Quantum Unstable Systems to the Decaying Dark Energy: Cosmological Implications

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