Quantum Field Theory in Curved Spacetime MCQs with Answers

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Quantum Field Theory in Curved Spacetime Online Quiz

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• Test Name: Quantum Field Theory in Curved Spacetime MCQ Quiz Practice
• Type: Quiz Test
• Total Questions: 40
• Total Marks: 40
• Time: 40 minutes

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Quantum Field Theory in Curved Spacetime

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1 / 40

What is the Euclidean path integral approach?

A computational tool in thermodynamics

A method for classical mechanics

A method to compute quantum amplitudes in imaginary time

2 / 40

What is the significance of the horizon temperature in black hole physics?

Determines the radiation spectrum

Describes classical orbits

Measures gravitational waves

3 / 40

What is the significance of a conformal field theory in curved spacetime?

Describes non-relativistic systems

Invariance under angle-preserving transformations

Measures classical trajectories

4 / 40

What is the impact of a strong gravitational field on quantum fields?

Has no impact

Causes particle creation

Causes particle annihilation

5 / 40

What is the role of an observer's acceleration in the Unruh effect?

Increases particle velocity

Decreases particle mass

Creates a perception of a thermal bath

6 / 40

What is the Bunch-Davies vacuum?

A high-energy particle state

A particular vacuum state in de Sitter space

A vacuum state in Minkowski space

7 / 40

What is the role of the metric tensor in curved spacetime?

Describes the geometric properties of spacetime

Measures the energy of particles

Quantizes the electromagnetic field

8 / 40

Which concept connects quantum mechanics and general relativity in curved spacetime?

Quantum gravity

Classical mechanics

String theory

9 / 40

What is the significance of the Bogoliubov transformation in QFT in curved spacetime?

Describes wavefunction collapse

Measures particle spin

Relates different vacuum states

10 / 40

What is the significance of the Hartle-Hawking state?

A state of maximal entropy

A proposed ground state for the universe

A classical solution to Einstein's equations

11 / 40

What is the relationship between entropy and the event horizon of a black hole?

Entropy is proportional to the horizon area

Entropy is inversely proportional

Entropy is independent of the horizon

12 / 40

What is the name of the radiation predicted to be emitted by black holes?

Cherenkov radiation

Bremsstrahlung

Hawking radiation

13 / 40

Which theoretical physicist is well-known for contributions to QFT in curved spacetime?

Stephen Hawking

Richard Feynman

Albert Einstein

14 / 40

What equation is modified for use in curved spacetime?

Klein-Gordon equation

Pauli equation

Schrödinger equation

15 / 40

What is meant by "backreaction" in semiclassical gravity?

Ignoring quantum field effects

Effect of quantum fields on the spacetime geometry

Only considering classical fields

16 / 40

What does the term "event horizon" mean?

Region of intense magnetic fields

Boundary beyond which nothing can escape

Surface of a neutron star

17 / 40

What is a key concept in semiclassical gravity?

Disregarding quantum effects in gravity

Treating gravity classically and matter quantum mechanically

Fully quantizing gravity

18 / 40

How does the AdS/CFT correspondence relate to QFT in curved spacetime?

Describes quantum tunneling

Provides a duality between a gravity theory in AdS space and a CFT

Measures classical field dynamics

19 / 40

What is the significance of the Rindler coordinates?

Describe a uniformly accelerated frame

Describe spherical coordinates

Describe rotating frames

20 / 40

What is the effect of spacetime curvature on quantum field modes?

Alters the frequency and amplitude of modes

Has no effect on the modes

Only affects high-energy modes

21 / 40

What does the term "geodesic" refer to?

The shortest path between two points in curved spacetime

A path of a charged particle in a magnetic field

A straight line in flat spacetime

22 / 40

Which field equation is solved in a curved spacetime background in QFT?

Einstein field equations

Newton's laws

Maxwell's equations

23 / 40

What is the Unruh effect?

Particle creation near event horizons

Entanglement of distant particles

Perception of a thermal bath by an accelerated observer

24 / 40

How does the cosmological constant affect quantum fields in curved spacetime?

Has no effect on quantum fields

Alters the dynamics of quantum fields

Only affects classical fields

25 / 40

What is the primary effect studied in Hawking radiation?

Black hole evaporation

Cosmic microwave background radiation

Quantum teleportation

26 / 40

What does QFT in curved spacetime primarily study?

Quantum fields in flat spacetime

Quantum fields in a non-flat background

Classical fields in curved spacetime

27 / 40

What phenomenon is associated with particle creation in an expanding universe?

Quantum tunneling

Cosmological particle production

Black hole evaporation

28 / 40

What does the term "renormalization" refer to in QFT?

Removing infinities from calculations

Ignoring certain quantum effects

Calculating exact solutions

29 / 40

What is a primary tool for studying QFT in curved spacetime?

Path integral formulation

Newtonian mechanics

Classical wave equations

30 / 40

What is the primary consequence of the equivalence principle in QFT in curved spacetime?

Constant speed of light

Gravitational force quantization

Local physics is the same in all free-fall frames

31 / 40

What does the term "vacuum state" refer to in QFT?

A state with maximal particles

A state with no particles

The lowest energy state

32 / 40

Which theorem is crucial for understanding QFT in curved spacetime?

Carnot's theorem

Bell's theorem

Noether's theorem

33 / 40

In what context does the term "spontaneous symmetry breaking" appear in QFT?

When symmetry is always preserved

When particles remain symmetric

When a symmetric state leads to asymmetric outcomes

34 / 40

What is the role of the stress-energy tensor in QFT in curved spacetime?

Measures temperature distribution

Describes the distribution of matter and energy

Quantizes the gravitational field

35 / 40

What does the term "vacuum polarization" mean?

Modification of the vacuum by virtual particles

Zero point energy

Complete vacuum state

36 / 40

What concept explains the thermal nature of black hole radiation?

Planck's constant

Entropy

Hawking temperature

37 / 40

Who derived the theory of black hole radiation?

Jacob Bekenstein

Stephen Hawking

Roger Penrose

38 / 40

How is the effective action used in QFT in curved spacetime?

Encodes all quantum effects in a classical background

Measures particle energy

Describes wavefunctions

39 / 40

What is the nature of quantum fluctuations in curved spacetime?

Constant, non-random changes

Large, predictable changes

Small, random changes in quantum fields

40 / 40

What is the Casimir effect?

Force between uncharged, conducting plates due to quantum vacuum

Magnetic field interaction

Particle-antiparticle annihilation

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