Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Azhar, Feraz"'
Autor:
Azhar, Feraz, Kaiser, David I.
Publikováno v:
Physical Review D 107 (2023): 043506
For decades, physicists have analyzed various versions of a ``cosmic no-hair" conjecture, to understand under what conditions a spacetime that is initially spatially anisotropic and/or inhomogeneous will flow into an isotropic and homogeneous state.
Externí odkaz:
http://arxiv.org/abs/2207.08355
In "Defeating Dr. Evil with Self-Locating Belief", Adam Elga proposes and defends a principle of indifference for self-locating beliefs: if an individual is confident that his world contains more than one individual who is in a state subjectively ind
Externí odkaz:
http://arxiv.org/abs/2103.12429
Autor:
Azhar, Feraz, Namjoo, Mohammad Hossein
Spacetime singularities in general relativity are commonly thought to be problematic, in that they signal a breakdown in the theory. We address the question of how to interpret this breakdown, restricting our attention to classical considerations (th
Externí odkaz:
http://arxiv.org/abs/2101.10887
Autor:
Azhar, Feraz
The leading account of several salient observable features of our universe today is provided by the theory of cosmic inflation. But an important and thus far intractable question is whether inflation is generic, or whether it is finely tuned---requir
Externí odkaz:
http://arxiv.org/abs/1911.05128
Autor:
Azhar, Feraz, Loeb, Abraham
It is commonly argued that an undesirable feature of a theoretical or phenomenological model is that salient observables are sensitive to values of parameters in the model. But in what sense is it undesirable to have such 'fine-tuning' of observables
Externí odkaz:
http://arxiv.org/abs/1910.13608
Autor:
Azhar, Feraz, Loeb, Abraham
Publikováno v:
Phys. Rev. D 98, 103018 (2018)
We introduce a mathematical framework for quantifying fine-tuning in general physical settings. In particular, we identify two distinct perspectives on fine-tuning, namely, a local and a global perspective --- and develop corresponding measures. Thes
Externí odkaz:
http://arxiv.org/abs/1809.06220
Autor:
Azhar, Feraz, Kaiser, David I.
Publikováno v:
Phys. Rev. D 98, 063515 (2018)
We analyze the flow into inflation for generic "single-clock" systems, by combining an effective field theory approach with a dynamical-systems analysis. In this approach, we construct an expansion for the potential-like term in the effective action
Externí odkaz:
http://arxiv.org/abs/1807.02088
Autor:
Azhar, Feraz
Extracting predictions from cosmological theories that describe a multiverse, for what we are likely to observe in our domain, is crucial to establishing the validity of these theories. One way to extract such predictions is from theory-generated pro
Externí odkaz:
http://arxiv.org/abs/1609.02586
Autor:
Azhar, Feraz, Butterfield, Jeremy
We discuss scientific realism from the perspective of modern cosmology, especially primordial cosmology: i.e. the cosmological investigation of the very early universe. We first (Section 2) state our allegiance to scientific realism, and discuss what
Externí odkaz:
http://arxiv.org/abs/1606.04071
Autor:
Azhar, Feraz
Publikováno v:
Physical Review D, 93, 043506, (2016)
An approach to testing theories describing a multiverse, that has gained interest of late, involves comparing theory-generated probability distributions over observables with their experimentally measured values. It is likely that such distributions,
Externí odkaz:
http://arxiv.org/abs/1601.05938