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Cosmic Information, the Cosmological Constant and the Amplitude of primordial perturbations
- Source :
- Physics Letters B, 773, Physics Letters B, Vol 773, Iss, Pp 81-85 (2017), Physics Letters B
- Publication Year :
- 2017
-
Abstract
- A unique feature of gravity is its ability to control the information accessible to any specific observer. We quantify the notion of cosmic information (‘CosmIn’) for an eternal observer in the universe. Demanding the finiteness of CosmIn requires the universe to have a late-time accelerated expansion. Combining the introduction of CosmIn with generic features of the quantum structure of spacetime (e.g., the holographic principle), we present a holistic model for cosmology. We show that (i) the numerical value of the cosmological constant, as well as (ii) the amplitude of the primordial, scale invariant, perturbation spectrum can be determined in terms of a single free parameter, which specifies the energy scale at which the universe makes a transition from a pre-geometric phase to the classical phase. For a specific value of the parameter, we obtain the correct results for both (i) and (ii). This formalism also shows that the quantum gravitational information content of spacetime can be tested using precision cosmology.<br />Physics Letters B, 773<br />ISSN:0370-2693<br />ISSN:0031-9163<br />ISSN:1873-2445
- Subjects :
- High Energy Physics - Theory
Nuclear and High Energy Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
FOS: Physical sciences
General Relativity and Quantum Cosmology (gr-qc)
Cosmological constant
01 natural sciences
Particle horizon
Cosmology
General Relativity and Quantum Cosmology
Gravitation
Theoretical physics
0103 physical sciences
010303 astronomy & astrophysics
Holographic principle
Physics
Spacetime
010308 nuclear & particles physics
Scale invariance
lcsh:QC1-999
Classical mechanics
High Energy Physics - Theory (hep-th)
lcsh:Physics
Free parameter
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 03702693, 00319163, and 18732445
- Database :
- OpenAIRE
- Journal :
- Physics Letters B, 773, Physics Letters B, Vol 773, Iss, Pp 81-85 (2017), Physics Letters B
- Accession number :
- edsair.doi.dedup.....d5a9792f1a72076fc6e6190767ec55c6